st: question about calculating frequencies

[Ekaterina Hertog <ekaterina.hertog@sociology.ox.ac.uk>]

Dear Maarten,
Thank you very much for the advice!
I slightly modified your suggestion as I needed to separate variables 
representing the number of men and the number of women expressing 
interest level 1 for a given activity.
so I extended your code as follows and it worked perfectly well!

foreach var of varlist int_* {
   bys sex `var' : gen N`var' = _N if `var' == 1
   bys sex (`var') : replace N`var' = N`var'[1]
   replace N`var' = 0 if N`var' == .
}

foreach var1 of varlist Nint_* {
   gen wom`var1' = `var1' if sex==2
   replace wom`var1' = wom`var1'[_N]
   gen men`var1' = `var1' if sex==1
   replace men`var1' = men`var1'[1]
}

foreach var of varlist Nint_* {   
   drop `var'
}   
  
thanks a lot!
sincerely yours,
katya
> --- On Sat, 27/3/10, Ekaterina Hertog wrote:
>   
> > I have a dataset containing individuals and about 40
> > variables representing their interest in various activities.
> > Each interest variable has a value of 1, 2 or 3 depending on
> > the strength of interest expressed. I need to calculate
> > numbers of men and women who expressed interest level 1 for
> > each activity and then incorporate them as constants into my
> > dataset.
> >     
>
> *----------------- begin example -------------------
> clear
> input id sex int_baseball int_music int_cinema
> 1    1           1        2    1
> 2    1           1        3    1
> 3    2           3        1    2
> 4    1           2        1    2
> 5    2           2        2    1
> end
>
> foreach var of varlist int_* {
> 	bys sex `var' : gen N`var' = _N if `var' == 1
> 	bys sex (`var') : replace N`var' = N`var'[1]
> 	replace N`var' = 0 if N`var' == .
> }
>
> list
> *------------------ end example ------------------------
>
> Hope this helps,
> Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
> http://www.maartenbuis.nl
> --------------------------
>
>
>
>
>       
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>   


--
Ekaterina Hertog (née Korobtseva)
Career Development Fellow
Department of Sociology and Nissan Institute of Japanese Studies
University of Oxford

27 Winchester Road
Oxford
OX2 6NA
United Kingdom


*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/