Re: st: re: Could Stata give the variance of the parameter estimates?

[jjc.li@utoronto.ca]

Thanks Kit! -nlcom- works in my case. I just know _b[x1] expresses the  
coef. of x1, but how to express the mean value of a variable? Like if  
I want to compute _b[x1]*"mean of x2"?

Thank you so much!

Crystal

Quoting Christopher Baum <baum@bc.edu>:

> <>
> Crystal said
>
> There is another question. I am going to use these var and covar to
> calculate the standard error for other factor (let's say SE(Mij)),
> according to a given fomular. But how could I tell if the Mij is
> significant at the 5% level, according to the calculated SE(Mij)?
>
> If you mean a linear combination of the coefficients, -help lincom-
> If you mean a nonlinear " " ", -help nlcom-
> Both will give you an S.E. and confidence interval for an expression
> involving the coefficients' values.
>
> Kit Baum   |   Boston College Economics and DIW Berlin   |
> http://ideas.repec.org/e/pba1.html
> An Introduction to Stata Programming   |
> http://www.stata-press.com/books/isp.html
> An Introduction to Modern Econometrics Using Stata   |
> http://www.stata-press.com/books/imeus.html
>
> *
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