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

[kchanp01]

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!

[ChrisHemedinger]

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.

[kchanp01]

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

[TomKari]

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

[kchanp01]

Thank you!