Changes

Jump to navigation Jump to search
367 bytes added ,  13:41, 21 September 2020
no edit summary
{{Project|Has project output=Data|Has sponsor=McNair ProjectsCenter
|Has title=Hubs
|Has owner=Jake SilbermanHira Farooqi,
|Has keywords=Data
|Has project status=TabledActive|Does subsume=Hubs Analysis 2017,
}}
'''Important Notice: The Hubs Research Project is a full-length academic paper analyzing last update to the effectiveness of "hubs", a component of the entrepreneurship ecosystem, in the advancement data was done manually by Ed and growth of entrepreneurial success is in a metropolitan areaE:\projects\MeasuringHGHTEcosystems\HubsData-RevisedSimplified. xlsx'''
This research will primarily focused on large and mid-sized Metropolitan Statistical Areas (MSAs), as that is where the greater majority of Venture Capital funding is located.
===Primary Data Set===The Hubs data setResearch Project is a full-length academic paper analyzing the effectiveness of "hubs", from SDC Platinuma component of the entrepreneurship ecosystem, has been constructed in the server: Data files are advancement and growth of entrepreneurial success in 128.42.44a metropolitan area.181/bulk/Hubs All files are It focuses on cities in 128the United States as the primary unit of analysis.42.44.182/bulk/Projects/Ecosystem/Hubs psql Hubs
This page contains information about data used for this research project, including data sources, location of data on RDP and details on data processing.
The data set includes all United States Venture Capital transactions (moneytree) from the twenty-five year period of 1990 through 2015.
Data has been aggregated at the portfolio company, fund, and round level. It will be analyzed at the combined MSA level. We will be looking at in terms of number of companies funded in number of funds active, and flow of investment in a given MSA.
The Information on initial data set has now been uploaded work done prior to the database server, named Summer 2017 can be found at [[HubsSummer 2016]].There are 4 tables: *Rounds: Rounddate, coname, state, roundno, stage1, etc.*CombinedRounds: Coname, rounddate, discamount, fundname*Companies: LastInv, FirstInv, coname, MSA, MSACode, Address, state, datefounded, totalknownfunding, industry(major)*Funds: fundname, closingdate, lastinv, firstinv, msa, msacode, avinv, nocoinv, totalknowninv, address
Used variables'''Note on joining:''' The city-state-year ID from VC data is used as the master ID for joining datasets. Each table (e.g. income, nih, nsf, sbir, compustat) is first joined with the VC data on city-state-year ID and then the resulting tables are all joined together in the final table.
Companies: Coname, MSACode, Industry, state
MSALookupTable: MSACode, MSASuper
IndustryLookupTable: IndustryMajor, InduCode
->
CompanyInfo: Coname, MSASuper, InduCode, state (complete)
Funds===Data by zip code===*Population data, 2000-2016 - US Census Bureau (E: fundname\McNair\Hubs\summer 2017)https://www2.census.gov/programs-surveys/popest/datasets/*Income data, msacode1998-2014 - The Internal Revenue Service (E:\McNair\Hubs\summer 2017)https://www.irs.gov/uac/about-irs*DCI index, stateto assess the economic well-being of communities MSALookupTablehttp: MSACode//eig.org/dci/interactive-maps/u-s-zip-codes*R&D Expenses, MSASuper 1980-2016 - Wharton Research Data Services (E:\McNair\Hubs\summer 2017)*Zipcode look-up table obtained from https://www.unitedstateszipcodes.org/zip-code-database/. It's available in (E:\McNair\Hubs\summer 2017). == Data by MSA == We have principle cities of MSAs from the census:https://www.census.gov/geographies/reference-files/time-series/demo/metro-micro/delineation-files.html We might be able to go City -> FIPS place code -> MSA? FundInfoCities and their FIPS codes (which don't perfectly correspond) are available from https: fundname//www.census.gov/geo/reference/codes/place.html The Census claims to provide city to MSA here: https://www.census.gov/geo/maps-data/data/ua_rel_download.htmlHowever, msacode, state (complete)there is only CBSA! This might do it: https://www2.census.gov/geo/pdfs/maps-data/data/rel/explanation_ua_cbsa_rel_10.pdfWe can maybe track city to principal city to MSA
Rounds: coname, rounddate, stagecode, roundno==COMPUSTAT Data== CombinedRounds: coname, rounddate, discamount, fundname -> RoundInfoSuperThe data set includes information on publicly traded firms in the US. It was obtained from the Wharton Research Data Services (https: coname, rounddate, '''nofunds''', discamount //wrds-> RoundInfo: Coname, roundyear, fundname, estamount (completeweb.wharton.upenn.edu/wrds/index.cfm?).
Then take:
RoundInfo: Coname, roundyear, fundname, estamount
CompanyInfo: Coname, MSASuper, InduCode, state
FundInfo: fundname, msacode, state
->
SuperRoundInfo: Coname, CoMSASuper, CoInduCode, CoState, FundName, FundMSASuper, FundState, RoundYear, RoundEstAmount
->
MSAPortCos: Count(CoName) As NoPortCosFunded, CoMSASuper, RoundYear
...
'''Notes on Creation of Primary Raw Data Set'''is in: E:\McNair\Projects\Hubs\Summer 2017 Z:\Hubs\2017
Raw tablesThe source file is RandDExpenditures.txt. It contains:* companies Date from 1980-2017 (last investment, first investment, company name, MSA, MSA code, address, state, date founded, known funding, industryJuly) . *427799 records*Fields include:* funds (fund closing date, last investment, first investment, fund name, address, MSA, MSA code, Average investment, number companies invested (NoCos), known investment) *R&D Expenditure* rounds *Address (round dateinc. city, company namezip, state, round number, stage 1, stage 2, stage 3) * combined rounds (company name, round date, disclosed amount, investor) *Revenue of firms* msalist (changes MSAs to CMSAs— combined MSAs) *industry list (changes 6 industry categories to 4— ICT, Life Sciences, Semiconductors, Other) Database is '''cities'''
Process*cleaned tables to eliminate duplications, undisclosed variables*changed all original characters to include CMSA and Industry Codes (companyinfo3, fundinfocleanfinal, roundinfoclean) *matched funds to avoid any issues with names (iSQL script is: COMPUSTAT.e. Fund ABC L.P./Fund ABC LP/Fund ABC) *matched roundinfoclean investors to fundinfocleanfinal investors (roundinfo.txt >> cleanfundfinal.txt)*join by round and company conames*bridge years (1990-2016), stage, and cmsa* populate data with count of companies (Deal flow) and estimated amount ($)** data set in 181 hubs folder under summarycmsa.txt (38394)sql
Key decisionsOutput file is COMPUSTATSummary.txt. It contains:*Threw out undisclosed co through-out as no addressVariables: City, year, No.public firms, sum R&D, sum Sales, sum total assets*Count is done by joining round and company*Anything fund related must be disclosed fund1979-2016*Near and far, and total invested, and fund counts, etc., are all done using disclosed funds that match only4440 cities
It is located in
Z:\Hubs\2017\Output_Files
'''Glossary of Tables'''==NSF Data== cleanco — used to remove duplicates from companies cleanedcompanies — clean set of companies with no duplicates cmsafunds- cmsas— list of all CMSAs Data is in final data set (for merging) cmsastats- statistics not including empty years (pre-merge) cmsastats2 - statistics separated by year-MSA cmsastats3— statistics separated by year-MSA-stage cmsastats4 cmsayears— empty merged table between year and cmsa: cmsayearstage — empty merged table between cmsa/years and stageE:\McNair\Projects\Hubs\Summer 2017 combinedrounds— raw sdc data for combined roundsZ:\Hubs\2017 combinedroundswamt— used to join rounds and combined rounds for roundinfo2 companies- raw SDC company data companyinfo — cleaned companies joined with state and CMSA information companyinfo2— companyinfo1 with original industry categories companyinfo3— companyinfo2 with updated industry categories and codes companyinfo4-- clean version of companyinfo3 companyround- combined company information with round information companyround2- combined company information with round information, cleaned up from companyround2 companyround3- combined company information with round information, cleaned up from companyround3 Database is '''finaldatasetcities'''- final statistics by CMSA-year, see section Final Primary Data Set for more information fundinfo— funds joined with CMSA info fundinfo2 - clean version of fundinfo1 fundinfoclean - used in process to clean fundinfo2 fundinfoclean2- used in process to clean fundinfo2 fundinfocleanfinal- used in process to clean fundinfo2 fundinfocleannodups- final clean set of fundinfo funds - raw SDC fund data Houston - analysis for Houston ecosystem team Houston2- analysis for Houston ecosystem team houston3- analysis for Houston ecosystem team industry — new industry codes (4)— used for all future data sets industrylist— lookup table for new industry codes (went from 6 to 4) joined1- used for matching process joined2- used for matching process matchfund2- used for matching process matchfunds- used for matching process matchroundfund - used for matching process matchroundfund2- used for matching process msalist — lookup table for MSA to CMSA (used for all future data sets) nearfar1-- beginning set before adding nearfar/stage variables nearfar2 -- added binomial variables for near/far and for each of the stages, used to build final dataset roundfund— not used— joined round to fund; drop/ignore roundinfo— round info cleaned up to include number of investors in a syndicate and estimated investment per member of syndicate roundinfo2— roundinfo1 including name of investors/funds roundinfo3— clean version of roundinfo2 roundinfoclean — final clean version of roundinfo3 (final roundinfo table) rounds — raw SDC round data stages — table for merging stage-year-CMSA superinfo — ignore/drop temp - used for matching process years — table for merging stage-year-CMSA
===Hub Candidates Data Set===SQL script is: nsf_2017.sql
The Hubs candidate data set is a list of potential hubs found in MSAs throughout the countrysource files are: nsf2017. Researchers are currently pulling qualitative and quantitative information txt, copied from the candidatetable '''nsf'''s websites, in an attempt to categorize what can be identified as a hub. This is a difficult data set to pull, as there is little to no quantitative information available for this category of institution, and is dependent on accessibility of information to the public on nsf_institution copied from table '''nsf_grants_institution''' from the internetbiotech db.
Characteristics/VariablesThey contain:*Year FoundedAward ID*Square footageAward Institution*LinkedIN self-identifiers (what the organization classifies itself on its LinkedIN profile) *Activeness on Twitter (binomial)*Member Directory available online (binomial)*Number of conference rooms*Price ($/month) for Flex desk *Offers Reserved desk (binomial)*Offers office space for rent (binomial) Award Effective date*Offers community membership-- not for coworking but for community events, etc. (binomial)Institution city*Number of events offered per month (estimate)Award Value*Offers Organization state code academy*Mission Statement/Vision (for qualitative or keyFrom 1900 -word analysis) 2017
These characteristics/variables will be used to determine whether a candidate Output file is or is not likely to be a HubnsfSummary.txt. It contains:*Variables: City, State code year, nsf_nogrants, nsf_valuegrant *1900-2017
As ===Joined NSF table===The joined nsf table with the VC table is found in db '''cities'''. The table is named '''merged_nsf'''.All the values of March 10th 2016, the list contains 125 Hub candidatesnogrants and valuegrant with missing values for years 1990-2017 are set equal to 0.The sql script is in Z:\HUbs\2017\sql scripts
'''Where to find'''==NIH Data==Data is in: Z: The \Hubs data set can be found in the Ecosystem>> E:\McNair\Projects\Hubs>>dataset folder. It is not currently in the database due to a UTF8 issue\Summer 2017
===Supplementary Data Sets===Database is '''Patent datacities'''SQL script is: to be pulled from USPTO or SDC Platinumnih2017. sqlThe source files are: *nih_1986_2001.csv*nih_2002_2012.txt*nih_2013_2015located in E:\McNair\Projects\Federal Grant Data\NIH
'''Number of STEM Graduate Students''' (NSF) and '''University R&D Spending''' (NSF):
*University R&D Data found under file "NSF DATA_2004 to 2011.xlsx" in datasets folder (Ecosystem>>Hubs>>Datasets)
*R&D spending found at the university level for 2014 ("Stem Grad Students.xlsx) or at state level ("Science and Engineering Grad Students by State and Year 2000-2011.csv")
** not uploaded to server or matched yet to CMSA code, because of this discrepancy.
**"Stem Grad Students.xlsx" contains categorized university by MSA, can be used for all university-based projects
'''Per Capita Income''' and '''Employment Data''' (US Census Bureau):
*"Per Capita Personal Income by MSA 2000-2012.xlsx" in datasets folder (Ecosystem>>Hubs>>Datasets>>Data from Yael)
*"Wages and Salaries by MSA 2000-2012.xlsx" in datasets folder (Ecosystem>>Hubs>>datasets>>Data from Yael)
**not uploaded to server or matched yet to CMSA code
The script that cleans NIH data and generates the summary table is titled '''Firm BirthsnihSummary''' (BDS)*in server 181, under table name "BDS"*includes birth, death, net(birth-death) and rate(death rate) for years 1990-2013 for every msa*includes code for CMSA but . It is not aggregated by CMSA** i.e. BDS statistics are still separate for all the smaller MSAs in New York's CMSA (code=1)located here:
===Resources===* Yael Hochberg and Fehder (2015), located in dropbox** Use this paper as a guideline on how to conduct the analysis*US Census Bureau data on employment by MSA Z: http://factfinder.census.gov/faces/tableservices/jsf/pages/productview.xhtml?pid=ACS_14_5YR_B23027&prodType=table*USPTO utility patents by MSA: http://www.uspto.gov/web/offices/ac/ido/oeip/taf/cls_cbsa/allcbsa_gd.htm*MSA level trends: http://www.metrotrends.org/data.cf\Hubs\2017\sql scripts
===The Target Dataset===This table includes*year*city*state*country*nogrants (number of grants)*valuegrant*city_state
We will need to process the following variables:*SuperMSA Date from 1986- combine SanFran and SanJose, New York and Newark?, NC Research triangle, others?*CSV mapping msas to cmsas is in the folder (and a table in the dbase)2015
===Joined NIH table===
The joined NIH table with the VC table is found in db '''cities'''. The table is named '''merged_nih'''.
All the values of nih_valuegrant and nih_nogrants with missing values for years 1986-2015 are set equal to 0.
The sql script is in
Z:\HUbs\2017\sql scripts
Example dataset==Clinical Trials Data==Data is in: MSA Year SeedVCInv SeedEarlyVCInv LaterVCInv NoDeals FundsInvested DistinctInvestors ....Z:\Hubs ---------------------------------------------------------------------------------------------------------------------------- 1234 2001 1000000 20000000 30000000 4 7 7E:\McNair\Projects\Hubs\Summer 2017
Database is '''cities'''
SQL script is: ctrials.sql
The source file is:
Note that the unit of observation is MSA-Year*medclinical.txt
Variables to be computed at the MSA levellocated in Z:*HubActive (binary)*NoHubsActive (Count)*HubSqFt*Other Hub Vars (build list!!!)*'''SeedVCInv''' (Seed/Start-up)*'''EarlyVCInv''' (Early Stage)*'''LaterStageVC''' (Later)*'''OtherStageVC''' (Buyout/Acq, Other)*'''NoDeals''' (done by local VCs?)**'''NoDealsNear'''**'''NoDealsFar'''*NoPortCosFunded*'''FundsInv''' (in an MSA)**'''FundsInvFromNear''' (within MSA?)**'''FundsInvFromFar''' (outside MSA?)*DistinctInvestors (?)**DistinctInvestorsNear (within MSA?)**DistinctInvestorsFar (outside MSA?)*PatentCount*NoSTEMGrads*FirmBirths (BDS data)*UniRandDSpend*PerCapitaIncome*Employment\Hubs\2017
We need to:*Check funds invested means dollars invested*Categorize near and far! Is it within MSA vs. not, within adjacent MSAs, etc.?Date from 1999-2017
===Joined clinical trials table===
There may be a second dataset that has Hub-Industry-Year (where industry The file which contains the number of trials in each city and year is semiconductor/non-semiconductor?)located in: Z:\Hubs\2017 The file is in: Z:\Hubs\2017\clean dataThe name of the file is: ctrialsSummary.txt
===Final Primary Data Set===It contains:*city*year*city_state_year*noctrials - number of trials
*Deal The ctrials is a round syndicate (near/far deal joined with VC table. The joined SQL script is one investor that : '''new_ctrials.sql''' and it is near/far).located in Z:\Hubs\2017\sql scripts
Table The name: finaldataset cmsa year totalamountinv--total amount invested nearamountinv--amount invested from local funds faramountinv-- amount invested from funds outside CMSA earlyinv--amount invested in early stage companies laterinv--amount invested in later stage companies startupseedinv--amount invested in seed or startup stage companies otherstageinv--amount invested in Acquisition/Buy-outs/Other stage companies investingfund--distinct funds that are investing in that CMSA-year investingfundnear--distinct funds from that CMSA that invested in that CMSA-year investingfundfar--distinct funds from outside that CMSA that invested in that CMSA-year deals--number of deals neardeals--number of deals inside a CMSA fardeals--number of deals from outside a CMSA --some of these deals might count in both categories, because of syndicate members being both inside and outside the CMSA earlystagedeals--deals with earlystage companies laterstagedeals--deals with later stage companies startupseeddeals--deals with startup/seed companies otherstagedeals--deals with companies in other stages newportcosfunded--number of portfolio companies to receive their first investment in that yearjoined table is '''new_merged_ctrials'''.
It contains:*city*state*city_state_id*city_state_year*year*noctrials*seedamtm*earlyamtm*lateramtm*selamtm*numseeds*numearly*numlater*numsel All the values of noctrials with missing values for years 1999-2017 are set equal to 0. ==Population Data==Data is in: Z:\Hubs E:\McNair\Projects\Hubs\Summer 2017 Database is '''cities''' SQL script is: '''population.sql'''The source files are: *pop2000_2009.xlsx*pop2010_2016.xlsx They contain:*State*City name *Year *Population Estimates Date from 2000-2016 ===Joined population table=== Data by is in: Z:\Hubs\2017\clean dataThe file names are 1_population.txt - contains data on population estimates from 2000-2009 2_population.txt - contains data on population estimates from 2010-2016  Database is '''cities'''SQL script is: '''new_population.sql''', located in Z:\Hubs\2017\sql scripts The population table is joined on VC table. The table is called '''new_merged_population'''. They contain:*City*State*city_state_id to uniquely identify each city*city_state_year to uniquely identify each city in each year*Population estimates*Year*Code from the state code and Fips code*State full name ==Income Data== Raw data was obtained from Census data, American Communities Survey. Raw Data is in: E:\McNair\Projects\Hubs\Summer 2017\MSA Income_raw.zip   Date from 2005-2015 The master list with MSAs and principal cities is titled '''list2.xls'''. It is located at: Z:\Hubs\2017 This master list includes:*MSA code*MSA name*Principal City*State*Place code (city code)*State Code This master list was edited to associate each principal city with a unique state. E.g. if New York is the principal city located in New York-New Jersey MSA, it was associated with state NY-NJ. So '''list''' was edited to put New York with NY.   Cleaned Income data files are in Z:\Hubs\2017\merging_on_ID  They contain:*MSA code*MSA*Year *Total Household Income  The MSA-City-State look up file is titled '''msa_city_state_wcode.txt'''. It is located in Z:\Hubs\2017\merging_on_ID  The SQL file that merges income data from ACS (by MSA - Year) with the MSA-City file is titled '''income.sql'''. It is located here: Z:\Hubs\2017\sql scripts The final income table is in db '''cities''' titled '''merged_income'''. It includes:*MSA*City*State*Year*Total Household Income  The table includes 8780 observations ===Joined income table===1Data is in: Z:\Hubs\clean dataThe file names are: INC_05. Population data txt - INC_15.txt  Database is '''cities'''SQL script is: merged_income.sql  They contain:*City*State*city_state_id to uniquely identify each city*Income*Year*Code from the state code and Fips code ==Employment Data== Data on employment was obtained from American Communities Survey, US Census Bureau.httpsRaw Data is in: E://www2\McNair\Projects\Hubs\Summer 2017\Employment Data by MSACleaned files are in Z:\Hubs\2017\clean data They contain:*MSA code*MSA*Year *Employment rate of individuals 16 years or older*Unemployment rate of individuals 16 years or older Date from 2005-2015 The SQL file that merges employment data from ACS (by MSA - Year) with the MSA-City file is titled '''Employment.censussql'''.gov/programsThe file is located in: Z:\Hubs\2017 The final table is in db '''cities''' titled '''merged_employment'''. It includes:*MSA*City*Year*Employment rate*Unemployment rate ===Joined employment table=== Data is in: Z:\Hubs\clean data The file names are: EMP_05.txt -surveys/popest/datasets/EMP_15.txt  Database is '''cities'''SQL script is: '''new_employment.sql''' and it is located in Z:\Hubs\2017\sql scripts2The final table which is joined on VC is in db cities titled '''new_merged_employment'''. Income  They contain:*City*State*Code from the state code and Fips code*city_state_id to uniquely identify each city*city_state_year to uniquely identify each city in each year*Employment rates of individuals of 16 years or older*Unemployment rates of individuals of 16 years or older*Year ==Schooling Data== Data on schooling was obtained from American Communities Survey, US Census Bureau. Raw Data is in: E:\McNair\Projects\Hubs\Summer 2017\School Enrollment Data by MSACleaned files are in Z:\Hubs\2017\clean data They contain:*MSA code*MSA*Year *Total number of population 3 years and over enrolled in school*Percent of population 3 years and over enrolled in public school*Percent of population 3 years and over enrolled in private school  Date from 2005-2015 The SQL file that merges schooling data from ACS (by MSA - Year) with the MSA-City file is titled '''schooling.sql'''. The Internal Revenue Servicefile is located in:https Z://www\Hubs\2017 The final table is in db '''cities''' titled '''merged_schooling'''.irs It includes:*MSA*City*Year*Total*Percent_public_schooling*Percent_private_schooling ===Joined schooling table=== Data is in: Z:\Hubs\clean dataThe file names are: SCH_05.gov/uac/abouttxt -irsSCH_15.txt  Database is '''cities'''3SQL script which joins this table with VC table is: '''new_merged_schooling.sql'''The final table is in db '''cities''' titled '''new_merged_schooling'''. DCI index,  It contains:*City*State*city_state_id to uniquely identify each city*city_state_year to assess uniquely identify each city in each year*Total number of school enrollment*Percentage enrolled in public schools*Percentage enrolled in private schools*Year*Code from the economic wellstate code and Fips code ==VC Data==   Raw Data is in: Z:\VentureCapitalData\SDCVCData\vcdb2 The file name is roundleveloutput2.txt It contains:*city*state*year*seedamtm - seed, amount in millions*earlyamtm - early, amount in millions*lateramtm - late, amount in millions*selamtm -being seed early late, amount in millions*numseeds - number of communitiesseeds*numearly *numlater*numsel*numdeals*numalive  Date from 1948-2017  The table is in db '''cities''' titled '''new_vc'''.httpIt includes://eig*city*state*city_state_id*city_state_year*seedamtm*earlyamtm*lateramtm*selamtm*numseeds*numearly*numlater*numsel*numdeals*numalive*year ==Final Joined Data set ==  The final data set is in file '''final.org/dci/interactivetxt''' and is located here: Z:\Hubs\2017 It includes:*city*state*city_state_year - (ID that data is merged on)*year*seedamtm - Seed Amount*earlyamtm - Early Investment Amount*lateramtm -maps/uLate Investment Amount*selamtm -sSeed early or late amount*numseeds -zipNumber of seed investments *numearly - Number of early investments*numlater - Number of late investments*numsel *numdeals - Number of deals (first contracts)*numalive - Number of start ups alive*income - Income per capita in each city-year*sbir_nogrants - Number of SBIR grants*sbir_valuegrant - Value of SBIR grants*emp - Employment stats of each city-year*unemp - Rate of unemployment*popestimate - Population estimate of each city-year*private - Enrollment in private schools*public - Enrollment in public schools*total - *numfirms - Number of publicly traded firms*randd - R&D expenditure of publicly traded firms*revenue - Revenue of PTF*totalassets *nsf_nogrants - Number of NSF grants*valuegrant - Value of NSF grants*nih_nogrants - Number of NIH grants*nih_valuegrant - Value of NIH grants*noctrials - NUmber of clinical trials == Defining Hubs == '''Summer 2016''' - Last year a master list of 125 "potential" hubs was used. A scorecard was developed which filtered these 125 candidate hubs to determine which of these should be included in the study sample. This method resulted in a sample size of ~ 30. The master list and the final hubs list is titled '''Hubs Data v2_'16'''. It is located here: Z:\Hubs\2017\hubs_data '''Summer 2017''' - In order to obtain a more statistically significant sample of hubs, we developed 5 criteria which produce a more relaxed definition of hubs than last year. These include *Availability of co-codesworking space*Coding classes or tech events*Some focus on the tech sector (this is important as our dependent variable is VC funding)*Presence of an accelerator*Availability of mentorship for members. We will review the 125 candidate hubs and select those which satisfy a subset or all of these characteristics.   [[category:Internal]]

Navigation menu