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st: re: forvalues and bysort


From   Christopher Baum <kit.baum@bc.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: re: forvalues and bysort
Date   Mon, 6 Dec 2010 12:23:47 -0500

<>
forvalues i = 1/9 {
forvalues j = 1/9 {	
bysort urb : scalar welfare = w`i'bar*(lnp`i'bar*1.1) +
0.5*w`i'bar*_b[e`i'`j'c]*(lnp`i'bar*1.1)*(lnp`j'bar*1.1)
			}
		}
*
di welfare

This makes no sense, as you would be redefining the scalar for each value of urban, i and j. Is there only one observation for, e.g.,
w1bar? If not, the expression does not even resolve to a scalar quantity. It sounds like you want to use by urb: generate..., but in that context
you should presumably be producing 9x9 = 81 new variables: one for each value of i and j.

Kit 

Kit Baum   |   Boston College Economics & 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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