Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

RE: st: Re: egen mean function


From   James Avery <macavery@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   RE: st: Re: egen mean function
Date   Thu, 18 Aug 2005 13:53:40 -0700 (PDT)

Nick,

I have a survey that was conducted over many days
(390) with many interviews each day (58,373 cases
total). So I have a numeric variable "day" (which runs
from 1 to 390) and another numeric variable - campaign
statements (st) - that is daily (see below). I want to
create a new variable (st_7) that is the mean
statements for the prior 7 days. Of course, I want
values for all cases.

Thanks!

James

           day         st
25014. |   237        154 |
25015. |   237        154 |
       |------------------|
25016. |   237        154 |
25017. |   237        154 |
25018. |   237        154 |
25019. |   238     162.67 |
25020. |   238     162.67 |
       |------------------|
25021. |   238     162.67 |
25022. |   238     162.67 |


--- Nick Cox <n.j.cox@durham.ac.uk> wrote:

> This really is in your court. Why do you 
> have these multiples? 
> 
> It seems that your data are not appropriate for
> -tssmooth-, 
> given what you said in a prior -tsset- (did you
> declare
> the panel variable?). I don't think there is 
> any question of a work-around until the data 
> set-up is clear. 
> 
> Nick 
> n.j.cox@durham.ac.uk 
> 
> James Avery
>  
> > Nick, Kit,
> > 
> > Thanks. But when I use tssmooth, I am told there
> are
> > repeated time values in sample:
> > 
> > tssmooth ma st_7 = st, window(7 1)
> > repeated time values in sample
> > 
> > I have a number of cases for each time period. Any
> way
> > to get around this?
>  
> n j cox 
> 
> > > Kit is referring to a function in the -egenmore-
> > > package on SSC.
> > > 
> > > In official Stata, see -tssmooth-.
> 
> Kit Baum
>  
> > > egen filter
>  
> James
>  
> > > I am using a rolling cross-sectional survey. So
> I
> > > have
> > > individual-level data. There are many days and
> many
> > > individuals interviewed each day. I have a
> variable
> > > for day and another variable for campaign news
> > > volume
> > > (CNV). I would like to create a new variable,
> prior
> > > week campaign news volume (PWCNV) that is the
> mean
> > > CNV
> > > for the prior 7 days. Is it possible to do this
> with
> > > the egen mean function or with another egen
> > > function?
> 
> *
> *   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/
> 


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 
*
*   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/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index