Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, is already up and running.

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

st: xtreg main effect and interaction

From   Ricardo Ovaldia <>
Subject   st: xtreg main effect and interaction
Date   Mon, 15 Aug 2011 05:33:24 -0700 (PDT)

I used -xtreg- to fit a random effect model on longitudinal data.

The model is of the form:

xi:xtreg Y*time x1 x2 ...

The group has three levels. I get a significant group effect (p=0.023) and a significant interaction (p<0.001). -time is also significant (p<0.001) . My questions are:
1. How to interpret the main group effect in the presence of the interaction? and 
2. how do I estimate the size of the effect?

Thank you in advance,

Ricardo Ovaldia, MS
Oklahoma City, OK

*   For searches and help try:

© Copyright 1996–2015 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index