Using a data set of 209 countries, I have run a fixed effects regression for non-OECD countries.
When I summarize my variables, it gives me all of the variables in data set, but I only need a summary of those variables that have been used in my fixed effects regression. For instance, when I run fixed effects, the number of groups is 138. So, my total observations for a variable should be 138 multiplied by 26 years (1980-2006), which is only 3588 observations.
How can I ask Stata to generate this?