Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

st: panel normalisation before xtgee


From   [email protected]
To   "[email protected]" <[email protected]>
Subject   st: panel normalisation before xtgee
Date   Tue, 31 Mar 2009 16:59:23 +1000

Dear Statalist,

I am using xtgee (xtgee, f(nb) corr(ar1) vce(r)) to analyze an unbalanced panel data set (with 73 countries, 1980-2006). Someone suggested that I normalize my variables by subtracting the mean from each of my observations. 
e.g. 
YEAR        VARIABLE ONE
year 1980  observation 1 for variable 1 - mean of observation of variable 1
year 1981  observation 2 for variable 1 - mean of observation of variable 1
year 1982  observation 3 for variable 1 - mean of observation of variable 1

Is this necessary?  
Any opinions on this subject would be great.
Allison
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2024 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index