Thank you very much Martin for your response. I might have not been
clear. I am so sorry.
The mean that I would like to create is the mean of frequency (in
percentage actually not in absolute value) of just category 1 to start
with.
I am trying to find a data that could be used to make it easier
because I cannot send files on this list. Now I get confused also with
the data you created.
On Wed, Oct 21, 2009 at 6:16 PM, Martin Weiss <[email protected]> wrote:
>
> <>
>
> The - forv y=1952/1998- should probably run as - forv y=1953/1997- for a
> three year window so no window gets "chopped"...
>
>
> HTH
> Martin
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Martin Weiss
> Sent: Mittwoch, 21. Oktober 2009 23:52
> To: [email protected]
> Subject: st: RE: How to generate this variable please?
>
>
> <>
>
> Try this with no warranty :-)
> I do have a feeling there is some command, like moving average or -rolling-,
> that can make this a little more elegant...
>
> **
> clear*
> set obs 51
>
> gen year=_n+1949
> expand 100
>
> gen byte category=irecode(runiform(), /*
> */ 0, .08, .16, .24, .32, .4, .48, /*
> */ .54, .62, .68, .78, .89 )
>
> compress
>
> capture erase info.dta
> tempname hdle
> postfile `hdle' year /*
> */ category mean /*
> */ using info
>
> levelsof category, local(mycats)
>
> qui forv y=1952/1998{
> foreach cat of local mycats{
> cou if inrange(year, `y'-3, `y'+3) & /*
> */ category==`cat'
> post `hdle' (`y') (`cat') (`r(N)')
> }
> }
>
> postclose `hdle'
>
> u info, clear
> gen lb=y-3
> gen ub=y+3
> order lb year ub /*
> */ category mean
>
> l, noobs sepby(year) h(30)
>
> **
>
>
> HTH
> Martin
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Nirina F
> Sent: Mittwoch, 21. Oktober 2009 23:05
> To: [email protected]
> Subject: st: How to generate this variable please?
>
> Dear all,
>
> I am not even sure how to search in the help for this so I thought I
> would ask you.
>
> I have two variables year (1950 to 2000) and field. Field has
> different categories 1 for accounting, 2 for art 3 for biochemistry
> etc....until 12.
>
> I would like to have a variable that shows the mean of the frequency
> in accounting (category 1) for year -3 and +3. To be more explicit:
> for example, I studied in 1955. I would like to attribute to myself
> the average frequency of people who did accounting between 1952 and
> 1958 so that it will be an indicator for me on how popular accounting
> was around 1955. For year 1950, we can just look at +3, for year 2000,
> we can just look at -3 years.
> I am confused myself so I hope you understand what I mean.
> then I would like to do it for category 5 and 6 together of variable Field.
>
> Thank you so very much in advance for your help,
> Nirina
> *
> * 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/
>
> *
> * 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/
>
> *
> * 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/
>
*
* 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/
