|Date: ||Wed, 22 Nov 2006 12:04:14 -0500|
|Reply-To: ||Peter Flom <Flom@NDRI.ORG>|
|Sender: ||"SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>|
|From: ||Peter Flom <Flom@NDRI.ORG>|
|Subject: ||Re: Proc reg test not consistent|
|Content-Type: ||text/plain; charset=US-ASCII|
>>> BruceBrad <BruceBrad@INAME.COM> 11/21/2006 9:05:46 pm >>> wrote
I have the following code. I want to test for the significance of the
different transforms of income as a group.
income2 = income*income;
incomelog = log(income+1);
model alrndom = income income2 incomelog /corrb collin;
test income, income2, incomelog;
I get an error message:
ERROR: The TEST is not consistent or has redundant column.
What's going on here? There doesn't seem to be undue collinearity as
far as I can see. The incomelog variable is not significant, and is
thus correlated with the intercept, but not extremely so.
The regression output is below.
I am not sure exactly what is going on, as I don't often use the TEST
statement. However, have you tried centering or possibly standardizing
the income variable before transforming it?
I have often found this helpful with similar problems
HTH and Happy Thanksgiving