topic Re: How to add a blocking factor in ANCOVA model in SAS EG in SAS Enterprise Guide

How to add a blocking factor in ANCOVA model in SAS EG

kchanp01 — Tue, 16 Feb 2016 21:54:39 GMT

Hi,

I am analyzing data from a randomized block design study. We have two independent variables, two covariate and one blocking factor (categorical). As I use a block design, I wonder what is a proper way to set up an ANCOVA model (Linear Model function) in SAS EG to take into account the blocking factor? Do I just add one more factor in the classification variable option in Linear Model and turn off (set to "False") the "class effects to use" in the Post Hoc Tests - Least Squares tab?

Thank you!

Re: How to add a blocking factor in ANCOVA model in SAS EG

ChrisHemedinger — Thu, 18 Feb 2016 00:35:55 GMT

I'm not a statistician but I'm told that our Linear Models task doesn't completely support ANCOVA out of the box. You might be able to use custom code in the task (use the Code Preview and you can add items at certain points) to add the options/statements you need.

As far as ANCOVA approach, you might want to ask in the Statistical Procedures board.

Re: How to add a blocking factor in ANCOVA model in SAS EG

TomKari — Thu, 18 Feb 2016 02:57:22 GMT

As an extension to Chris's note, it's really easy to add custom code to EG tasks. Don't hesitate to give it a try, and post questions if you have problems!

Tom

Re: How to add a blocking factor in ANCOVA model in SAS EG

kchanp01 — Thu, 18 Feb 2016 14:18:40 GMT

Thank you so much! Will post a question in another board.

Re: How to add a blocking factor in ANCOVA model in SAS EG

kchanp01 — Thu, 18 Feb 2016 14:19:10 GMT

Thank you!