Dear Gabriele Rovigatti ,
I am estimating a production function on COMPUSTAT data for the U.S. and using prodest:
prodest y, method(op) free(lcogs) proxy(i) state(k) poly(3) reps(50)
y = ln(revenue)
lcogs = ln(cost of goods sold)
i =ln(investment)
k = ln(cpaital)
How is it possible that the first time I obtain: Array
And now that I had to rerun it again because I close the do file for a moment, I get this:
. prodest y, method(op) free(lcogs) proxy(i) state(k) poly(3) reps(50)
.........10.........20.........30.........40...... ...50
op productivity estimator Cobb-Douglas PF
Dependent variable: revenue Number of obs = 199521
Group variable (id): id Number of groups = 19442
Time variable (t): year
Obs per group: min = 1
avg = 10.3
max = 61
------------------------------------------------------------------------------
year | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
lcogs | -1.131983 .0763131 -14.83 0.000 -1.281554 -.9824126
k | 1.125322 . . . . .
------------------------------------------------------------------------------
Wald test on Constant returns to scale: Chi2 = 174.01
p = (0.00)
Same data, number of observations, everything, I did not touch anything. Now, I have tried more times and keep getting the same or similar coefficient values, like -1.13 for the lcogs variable. Why was it able to give me correct results once but now every time I repeat it, those are pretty similar but very bad values. Appreciate the help. Thanks.
Related Posts with prodest only estimated correctly elasticities once and now it gives only negative coefficients
Displaying all the unique categories of a variableHI all, Please consider the following data set on ocuupation Code: clear . input str4 occu …
Plotting variable around certain thresholdHi Statalist members, I am working with survey balanced panel data covering 32 waves. I am analyzin…
Replacing valuesHi all, I have a dataset containing values ranging from 1 to 3. I'd like to replace all the 1 to 3,…
Instrumental Variable with binary endogenous variable and interactions and fixed effects - please help!Hello everybody, I please need your help, since I don't know how to proceed with my research. I'm…
Generating Percentage VariablesHi, I’m new to stata and am having trouble creating percentage variable (out of 100) for the percent…
Subscribe to:
Post Comments (Atom)
0 Response to prodest only estimated correctly elasticities once and now it gives only negative coefficients
Post a Comment