Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: Comparing "almost similar" variables across regression equations


From   "Christer Thrane" <ch-thran@online.no>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Comparing "almost similar" variables across regression equations
Date   Thu, 16 Jun 2005 19:53:51 +0200

Hi,

I have three regression models with the same dependent variable, i.e.

Y = a + b1x + control variables
Y = a + b2y + control variables
Y = a + b3z + control variables

where Y is the demand for a product type (i.e. money spent), x, y, and z are product quality ratings from three different raters (on a scale from 1 to 5) and the controls are a number of objectice product attributes.

I want to examine if the effects of x, y, and z are statistically different from each other. Since the ratings are highly correlated, I cannot include them in the same regression and use the test command.

Can this be done? If so, how?

Any help is appriciated!

Christer Thrane
Lillehammer University College

*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/




© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index