LISTSERV at the University of Georgia
Menubar Imagemap
Home Browse Manage Request Manuals Register
Previous messageNext messagePrevious in topicNext in topicPrevious by same authorNext by same authorPrevious page (September 1998, week 3)Back to main SAS-L pageJoin or leave SAS-L (or change settings)ReplyPost a new messageSearchProportional fontNon-proportional font
Date:         Wed, 16 Sep 1998 15:13:39 -0500
Reply-To:     Melinda MayField <Melinda_MayField@MGMT.PURDUE.EDU>
Sender:       "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
From:         Melinda MayField <Melinda_MayField@MGMT.PURDUE.EDU>
Organization: Krannert School of Management, Purdue University
Subject:      repeated measures anova problem
Content-Type: text/plain; charset=us-ascii

If you can help, please email privately at

I need help figuring out how to analyze this data in SAS. I distributed 4 forms of a research survey. Form 1 contains (1) first a competency statement; (2) then task statements. Form 2 contains (1) first task statements; (2) then a competency statement. Form 3 contains (1) first a competency statement; (2) then KSA statements. Form 4 contains (1) first KSA statements; (2) then a competency statement. The competency statements are always identical in all 4 forms, the task statements are identical in forms 1 and 2, and the KSA statements are identical in forms 3 and 4.

I want to analyze the effect of (1) order of competency statement (beginning or end) and (2) question type on subject ratings on our scales (task, KSA, or competency). I created scales by averaging the ratings on the task items and KSA items within a form. The competency statement has its own rating. So I have 3 variables: "TASKFREQ," "KSAFREQ," and "COMPFREQ." The complication is that I want to compare 3 levels of question type: task, KSA, and *competency*. How to do this confuses me, since the competency statements were on the same surveys as the task and KSA statements (i.e., I have 4 forms with competency statements, but only two with task statements and two with KSA statements). I can't name the competency and KSA/task scales the same since they are in the same dataset, and the same respondents filled out both task and competency statements OR both KSA and competency statements. How do I set up the ANOVA to look for differences in all 3 question type responses? I've tried using repeated measures ANOVA (using TASKFREQ, KSAFREQ, and COMPFREQ as the repeated measures), but I keep getting an error message that one of the variables is missing or has a freq of zero. I presume this is because "TASKFREQ" only appears in Forms 1 and 2, and "KSAFREQ" only appears in Forms 3 and 4. In case it helps, below I've pasted the SAS code I used for the unsuccessful repeated measures ANOVA. How do I handle this?

Please email me privately at


Back to: Top of message | Previous page | Main SAS-L page