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st: panel data question (2 years and 2 sites within each year)


From   "Paul Mcgeoghan" <[email protected]>
To   <[email protected]>
Subject   st: panel data question (2 years and 2 sites within each year)
Date   Sat, 07 Apr 2007 14:45:49 +0100

Hi,
 
I have data on 70 individual companies over 2 years. The dependent is number of items reported on 2
websites (either the companies website or government website) for each company.
 
In Stata, I go to Statistics > Time Series > Setup and Utilities > Declare Data to be Time Series
and enter Year as the Time variable and Panel ID is Company.
 
So I have data like for example:
For Website 0 represents companies own website and 1 represents government central website.
 
Company   Year   WebSite  TotalItems  Indep1  Indep2
A               2005    0      40             5           10
A               2005    1      30             4           20
A               2006    0      15             3           30
A               2006    1      25             5           40
B               2005    0      10             3           15
B               2005    1      20             4           25
B               2006    0      25             6           35
B               2006    1      30             3           40
etc
 
Using Random effects regression, I would then enter:
 
xtreg TotalItems Indep1 Indep2 , re
 
How would I include WebSite in the above?
 
Using a repeated measures terminology with which I am more familiar, I have 2 within subject
factors, Year and Site.
I can specify this model easily enough via using GEE.
 
Thanks,
Paul
 

==================
Paul McGeoghan,
Application support specialist (Statistics and Databases),
University Infrastructure Group (UIG),
Information Services,
Cardiff University.
Tel. 02920 (875035).
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