Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

Re:st:panel data manipulation


From   caglar <caglar@interchange.ubc.ca>
To   statalist@hsphsun2.harvard.edu
Subject   Re:st:panel data manipulation
Date   Fri, 13 Aug 2004 23:20:38 -0700 (PDT)

Clive,
Thanks for your suggestion. Actually, I tried to create lags and leads for my explanatory variables before. When I include all the leads and lags in an equation like the one below, STATA does not even do the estimation as there is no observation.

Y_i(t)= X_i(t) +L.X_i(t)+L2.X_i(t)....+F.X_i(t)+F2.X_i(t)..F8.X_i(t)

Even if the above equation were estimated, this equation would not give me coefficients on the variables from the regression  

Y_i(t) = X_i(t) + X_i1987 + X_i1988+....+X_i1997
 
i:1...N while t:1987..1997

I wonder if there is any command in STATA that will include all past and future values of the explanatory variables for every cross section over the 1987-1997 time series? 

Thanks

Caglar Kamu
PhD Student
Strategy & Business Economics Group
Sauder School of Business
The University of British Columbia

Caglar Kamu wrote:

> I have a fairly long unbalanced panel which is set by tsset id year. I am
> trying to estimate a pooled linear model within the time period 1987-1997
> such as below.
>
> Y_i(t) = X_i(t) + X_i1987 + X_i1988+....+X_i1997
>
> i:1...N while t:1987..1997
>
> How should I manipulate the variables such that I can include all the past
> and future explanatory variables in the regression above?

Create dummy variables for your year terms if you haven't already.

For your explanatory variables, use the -l.- operator to create lagged terms

. gen lagvar=l.var

and the -f.- operator to create lead terms

. gen leadvar=f.var

I hope this helps.



*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index