Difference between revisions of "MatchingLBO.do"
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− | Error invalid syntax | + | Error invalid syntax |
+ | Possible reasons: 1. use of _n and x 2. if loop |
Latest revision as of 17:45, 25 October 2016
This do file aims to match companies with the closest propensity score based on industry, year, and number of patents from STATApredictLBO.dta.
Attempt 1
use STATApredictLBO.dta, clear
rename nopatents case_nopatents
rename logitpw case_logitpw
rename gvkey case_gvkey
/*industry, year, and no. of patents*/
joinby industrygroup3 year using STATApredictLBO.dta
gen a = nopatents*0.95
gen b = nopatents*1.05
gen delta=abs(logitpw-case_logitpw)
drop if case_nopatents > b | case_nopatents < a
// GENERATE SOME RANDOM NUMBERS TO RANDOMLY BREAK ANY TIES
// ON CLOSENESS OF MATCH OF MARKET VALUE
set seed 0.5
gen double shuffle1 = runiform()
gen double shuffle2 = runiform()
by case_gvkey (delta shuffle1 shuffle2), sort: keep if _n == 1
drop delta shuffle1 shuffle2
Error op. sys. refuses to provide memory
Attempt 2
foreach x of varlish matchfilter{
if x==1{ foreach matchfilter[_n]==0{ if year[_n]==year[_x] & industrygroup3[_n]==industrygroup3[_x]{ if nopatents[_n]/nopatents[_x]<1.1 | nopatents[_n]/nopatents[_x]>1/1.1{ gen delta=abs(logitpw[_n]-logitpw[_x] m=gvkey[_min(delta)]} } } }
Error invalid syntax
Possible reasons: 1. use of _n and x 2. if loop