Statalist The Stata Listserver


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

Re: st: interaction between two continuous variables


From   Jeffrey Simons <[email protected]>
To   [email protected]
Subject   Re: st: interaction between two continuous variables
Date   Thu, 21 Sep 2006 07:17:46 -0500

The sslope routine which is available in the ssc archives will calculate simple slopes, their significance, and plot them.



Subject: st: interaction between two continuous variables


Hi,

I have the following model y continuous , x1 x2 continuous

I do a regression with

reg y cx1 cx2 cx1*cx2

with
cx1= x1 -mean (x1)
cx2= x2 -mean (x2)

both the paramters of cx1 and cx2 are signficants , which mean that the
slope of x2 is signficant for x1=mean (x1)

the paramter of cx1*cx2 is also signficant

How to interpret the parameter of cx1*cx2 ?

My first interpretation is that there are at least two values of x1 ,
where

the slopes of x2 are not parallels

but how to know, that the slope of x2 for a given value of x1=a is
signficant?

like using a lincom command

Any comments, please

Thanks

Sami

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