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Re: st: RE: using loop to generate distributions with different means and standard deviations


From   Lance Wiggains <lance.wiggains@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: using loop to generate distributions with different means and standard deviations
Date   Wed, 18 May 2011 13:36:13 -0400

I've tried that but the problem is that I'm pre-calculating the means
and sd's for the variable because I'm only using the last 3-4
observations for each variable to calculate those values. I'm doing
this because I want it to reflect the changes that happen recently. My
mean function uses tssmooth, with weights (1 1<2>), to average the
last 3 weeks of sales. So if sales were 70,80,90, and 100 I get a
value of 92.5 for my mean. It also calculates a SD for the last 3-4
observations. Then I want to plug those numbers into the drawnorm
function using a loop. Any idea about how that would work?

Lance

On Wed, May 18, 2011 at 1:16 PM, Sarah Edgington <sedging@ucla.edu> wrote:
> Lance,
> Try something like this:
>
>        forv i=1/3 {
>                 drawnorm name`i', m(mean_var`i') sd(sd_var`i')
>        }
>
> You'll run into problems, though, if your data actually includes the
> variable names you list since there isn't a sd_var1.
>
> -Sarah
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Lance Wiggains
> Sent: Wednesday, May 18, 2011 10:09 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: using loop to generate distributions with different means and
> standard deviations
>
> Statalist members,
>
> I'm trying to get Stata to generate a distribution of data from variables in
> my data set.
>
> My appended data looks like this
> mean_var1=90
> standard_deviation_var1=5
> mean_var2=100
> sd_var2=10
> mean var3=110
> sd_var3=15
> and so on
>
> I'm need a loop that will take my variables and create the distributions for
> me.
> I've been using the drawnorm command
>     drawnorm name1, m(mean_var1) sd(sd_var1) but I can't get it to
> recognize more than 1 variable at a time
>
> I want it to perform the distribution command for each pair of my variables.
> I.e. (m_var1, sd_var1), (m_var2, sd_var2) , (m_var3, sd_var3)
>
> Thanks for your consideration,
>
> Lance
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