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st: RE: RE: Fixed value - time series


From   Graeme Inglis <Graeme.Inglis@cancervic.org.au>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: Fixed value - time series
Date   Fri, 5 Jul 2002 09:28:23 +1000

Thanks Nick
I need to be more specific.
x is a categorical variable and can take the values 1,2,3,4.
x is taken at periods 0(baseline),1 ,2 ,3,.. and varies over time.
Values of x at these periods is x0, x1, x2, x3,....
I want to generate a newvar y = x0, value at baseline, such that
y0=y1=y2=y3=...

If I do 'gen y = x if period==0' I only get values for y in period '0'.

I hope this clarifies my question.
Thanks for your response.
Graeme

-----Original Message-----
From: Nick Cox [mailto:n.j.cox@durham.ac.uk]
Sent: Thursday, 4 July 2002 9:30 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: RE: Fixed value - time series


Graeme Inglis
> 
> I would appreciate some advice on how to do the following please.
> I want to generate a new variable which takes the baseline value 
> of another
> variable and it has this baseline value in each time period - it 
> is constant
> over time.

There is nothing to stop you going 

gen newvar = <constant> 

If that doesn't help, please give an example of what you 
mean by "baseline value". 

Nick 
n.j.cox@durham.ac.uk 
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