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

 From jjc.li@utoronto.ca To statalist@hsphsun2.harvard.edu Subject Re: st: re: Could Stata give the variance of the parameter estimates? Date Tue, 07 Jul 2009 17:34:35 -0400

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"?
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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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