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Re: st: RE: random values
Thanks Maarten!
But I do not quite understand how this may work. How will stata know which
40 days I want it to pull the 25 from? I have just written down (after
visual examination) when the 40 days of top production occurs.
?
AC
On 6/19/07 2:08 PM, "Maarten Buis" <[email protected]> wrote:
> keep 40 top production dates:
>
> gen minusprod = - production
> bys group minusprod: keep if _n <= 40
>
> select 25 random cases:
>
> set seed 12345
> gen random = uniform()
> bys group random: keep if _n <= 25
>
> Hope this helps,
> Maarten
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting address:
> Buitenveldertselaan 3 (Metropolitan), room Z434
>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Knag Anne-Christine
> Sent: dinsdag 19 juni 2007 13:33
> To: [email protected]
> Subject: st: random values
>
> Dear Statalist-members,
> I have a question about how to pull out random values.
> The data may be summarized as this:
>
> group day daily production
> 1 42 1025200
> 1 45 52000
> 1 etc (up to day 145) etc
> 2 36 2355000
> 2 37 450003
> 2 etc(up to day 150) etc
> 3 65
> up to group 9
>
> From each of the nine groups daily production I want to pull out 25 random
> values out of the period where peak production occurs. I have decided a 40
> days interval of peak production in each of the groups. The datasheet
> contains all production days, so I need to first be able to pull out the 40
> days and then find 25 random days within this period.
> Can Stata pull out 25 production days out of the 40 days interval and
> display the results in a table? I would like to run an ANOVA between and
> within groups at these 25 random days in the 40days maximum production
> period.
> Thanks!
> AC
>
> *
> * For searches and help try:
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>
> *
> * For searches and help try:
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> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
*
* 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/
