st: how to express the mean of a variable in a calculation?

[jjc.li@utoronto.ca]

Dear all,

I am going to calculate sth after the the regression. I know _b[x1]  
represents the coef. of variable x1. But how to express the mean of  
variable x2, in particular just the mean of x2 from year 1 to year 5  
(let's say there are total 10 years)?

Thanks!

Crystal

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