Hi
I have a huge panel dataset containing analyst forecasts. Each analyst is associated with an employer. Sometimes analyst change employer. I want to restrict my dataset, dropping the observations of analysts that never change employer. The dataset may look like this
forecast# analystID employer ID
1 1 1
2 1 1
3 1 1
1 2 1
2 2 1
3 2 2
4 2 2
1 3 3
2 3 4
In this case I'd nee to drop all observations by analyst 1 because he never changes employer, while keeping those of analysts 2 and 3.
I really cannot figure out the way to do it as visual inspection is just impossible with over 1.2m obs.
Thanks!
Stefano
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
