st: Re: Macro syntax help

["Michael Blasnik" <michael.blasnik@verizon.net>]

I'm not sure where the problem is, but I have some suggestions.  First, you 
don't need to create the indic and blah variables since regress returns the 
number of observations in e(N) and, even if it didn't, you could just use a 
count command and r(N).  It also isn't clear why you issue the same regress 
command twice and place the same result into two different variables.

Michael Blasnik


----- Original Message ----- 
"Meryle Weinstein" <meryle.weinstein@nyu.edu> wrote:

> I'm using the following syntax to run a regression analysis on a
> subset of cases that fall within a range of values (above/below the
> cutoff).  For some reason it's running the analysis on a random
> selection of cases that fall all over the place -- some are within the
> range, while others are way out of the range.  Any help in finding a
> bug in the program is appreciated.
>
> Meryle Weinstein
> Research Scientist
> Institute for Education and Social Policy
> New York University
>
> gen below = .
> gen above = .
> gen observ = .
> gen window = .
>
> gen treatfx_m4_2 = .
> gen se_m4_2 = .
> gen diff_m4_2 = .
>
> local counter = 0
>
> forvalues temp=0.25(0.05)10 {
> replace below = cutoff - `temp'
> replace above = cutoff + `temp'
>
> local counter = `counter' + 1
>
> regress p34mg4 ppov bor1t1 if ppov > below & ppov < above
> replace diff_m4_2 = _b[bor1t1] in `counter'
>
> regress p34mg4 ppov bor1t1 if ppov > below & ppov < above
> replace treatfx_m4_2  = _b[bor1t1] in `counter'
> replace se_m4_2 = _se[bor1t1] in `counter'
> gen indic = 1 if ppov > below & ppov < above
> egen blah = sum(indic)
> replace observ = blah in `counter'
>
> drop blah indic
>
> replace window = `temp' in `counter'
> }
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/