How did you specify that IV? If you put it in the factor box, it's being treated as categorical, just as if you specified it as a class variable in SAS. If you specify it as a covariate, it won't be treated that way. If you're using command syntax, you put it after a WITH on the GLM command, not after a BY, e.g., GLM V1 TO VK WITH IV, etc.

David Nichols Principal Support Statistician and Manager of Statistical Support SPSS Inc.

> -----Original Message----- > From: Annette Towler [SMTP:towleraj@RUF.RICE.EDU] > Sent: Wednesday, June 30, 1999 7:38 AM > To: SPSSX-L@LISTSERV.UGA.EDU > Subject: GLM > > Hi there > > SAS users tell me that PROC GLM allows analysis of a factorial design that > includes a continuous variable as an IV. Previously, I was running > Regression so as not to perform a dichotomous split on my continuous > variable. I have an old version of SPSS, which does not have GLM. > > Having been given this advice, I ran my data using SPSS's GLM function > (repeated measures) and discovered that it is treating the continuous > variable as categorical. I think that is what is happening because this > variable is eating up 21 degrees of freedom. As a result I have lost some > findings I obtained using the regression. > > Is there any way around this or will I need to revert back to using > regression? Sorry this seems like a stupid question. > > Thanks in advance. > > > > > Annette Towler > Psychology Department > Rice University > 466 Sewall Hall, MS 25 > 6100 Main > Houston, Texas 77005-1892