|Date: ||Tue, 15 Feb 2005 19:31:36 -0500|
|Reply-To: ||Heather Norton <hln109@PSU.EDU>|
|Sender: ||"SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>|
|From: ||Heather Norton <hln109@PSU.EDU>|
|Subject: ||losing degrees of freedom in proc glm|
I'm trying to run a proc glm using 3 classes (Phylum, Island Neighborhood).
However, neighborhood has a large # of levels while island and phylum have
Although I can analyze the main effects of phylum, island, and neighborhood
separately, when I try to use them all in the same model I run out of
degrees of freedom for both phylum and neighborhood. Is there any way to
get around this, or should I just be content with looking at each one
separately? Proc glms using just island and phylum, or island and
neighborhood work okay (although I run into the same problem when testing
for an interaction effect for island and neighborhood).
Many thanks for any help you can provide,