Repeated Anova - Within and Between factors

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Occasional Contributor
Posts: 11

Repeated Anova - Within and Between factors

Reposting this from here: https://communities.sas.com/t5/SAS-Statistical-Procedures/Anova-Analyzing-experiment-with-within-and...

 

Hi I have an experiment with one between subjects factor (Lets say FactorA) with two levels: Big and Small and one within subjects factor (FactorB - Quality) with three levels: 1, 2 and 3 - corresponding to High, Medium and Low.

 

I want to examine the effect of both the factors on the Dependent Variable measured after each of the participant was put into one of the two conditions (Big or small) and evaluate some things (High, medium and low) : Dep_Var1, Dep_Var2 and Dep_Var3.

 

I am using the following code: 

 

proc glm data = Dataset.data;
class FactorA FactorB SubjectID;
model  Dep_Var1, Dep_Var2 Dep_Var3= FactorA|FactorB /ss3;
repeated SubjectID, FactorB;

lsmeans Condition/pdiff stderr;
run;

 

However I keep on getting the following statement in the Log:

 

NOTE: The CLASS variable FactorB has only one level: '1'.
ERROR: Ambiguous level information in REPEATED statement

 

Also if I change this to the following:

 

proc glm data = Dataset.data;
class FactorA FactorB SubjectID;
model  Dep_Var1, Dep_Var2 Dep_Var3= FactorA|FactorB /ss3;
repeated SubjectID;

lsmeans Condition/pdiff stderr;
run;

 

I get the following error: 

NOTE: The CLASS variable FactorB has only one level: '1'.
NOTE: H Matrix for SubjectID*FactorB has zero d.f.


NOTE: H Matrix for SubjectID*FactorA*FactorB has zero d.f.

 

Here's a snippet of the data for easy reference:

 

SubjectID FactorA Dep_Var1 Factor_B Dep_Var2 Factor_B Dep_Var3 Factor_B
1 Big 9 1 2 2 29 3
2 Small 9 1 5 2 28 3
3 Small 12 1 2 2 27 3
4 Small 9 1 2 2 28 3
5 Big 11 1 5 2 29 3
6 Big 9 1 5 2 21 3
7 Small 9 1 2 2 26 3
8 Big 10 1 2 2 26 3
9 Big 13 1 5 2 25 3
10 Small 10 1 4 2 25 3

 

I realize that I am making a mistake in how I have input FactorB, but cannot figure out what to do here. Any help is appreciated.

 

Thanks.

Regular Contributor
Posts: 164

Re: Repeated Anova - Within and Between factors

Posted in reply to stanmarciano

you need to restructure the dataset so factorb is listed downwards, rather than being split into 3 separate variables. The dataset snippet cannot be right though: you can't have 3 variables with the same variable name 'factorb'

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