opreg Y, exit(Exit) state(K) proxy(I) free(L) cvars(Year) vce(bootstrap, seed(1) rep(5))
Note: ignoring 2 observations with missing value for proxy variable
(running opreg on estimation sample)
Bootstrap replications (5)
----+--- 1 ---+--- 2 ---+--- 3 ---+--- 4 ---+--- 5
.....
Olley-Pakes productivity estimator Number of obs = 30318
Group variable (i): Stkcd Number of groups = 4914
Time variable (t): Year
Obs per group: min = 1
avg = 6.2
max = 11
(Replications based on 4,914 clusters in Stkcd)
------------------------------------------------------------------------------
| Observed Bootstrap Normal-based
| coefficient std. err. z P>|z| [95% conf. interval]
-------------+----------------------------------------------------------------
Y |
K | .0112469 .0262279 0.43 0.668 -.0401588 .0626526
L | .6383019 .0170709 37.39 0.000 .6048436 .6717602
Year | .0301264 .0026188 11.50 0.000 .0249936 .0352592
------------------------------------------------------------------------------
State: K
Free: L
Control: Year
Proxy: I
. gen OP1=Y-_b[L]*L-_b[K]*K
(8 missing values generated)
. sum lp1_1 OP1
Variable | Obs Mean Std. dev. Min Max
-------------+---------------------------------------------------------
lp1_1 | 30,312 17.10338 1.073605 14.43997 21.44722
OP1 | 30,312 16.45872 .9151992 13.80934 20.81245