Statalist The Stata Listserver

[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: concitional means in regression

From   Blau Blau <>
Subject   st: concitional means in regression
Date   Fri, 27 Oct 2006 13:00:34 +0200 (CEST)


by definition the regression line should go through the conditional means of Y-variable in each X-variable. But when I compute conditional means of Y in each category of X the regression line does not go through these conditional means.

In statistical literature concerning regression I have found this explanation: we  work with sample and therefore we do not have all observations of Y variable in each X-variable, and this is the reason why we do not observe the correspondence among measured conditional means of Y variable and predicted conditional means given by regression line.   

Is this explanation correct and just one possible?

Thanks. Tomas  
*   For searches and help try:

© Copyright 1996–2017 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index