Repeated Measures ANOVA
Hi. I have conducted an experiment with 4 within subject variables. 1) Colour 2) Shape 3) Pattern 4) Movement Each of these 4 factors have 2 levels so each subject would be exposed to 16 conditions in total. However, I have made each subject do 10 replications per condition and I have 10 subjects so I have a total of 1600 data points. I have tried using SPSS repeated measures in GLM to analyse my data but I don't know how to include my replications. SPSS requires that I select 16 columns of dependant variables each representing a combination of my factors. However, I am only allowed one row per subject, so how do I input the 10 replications that each subject performed for each combination? Thanks ! Alfred Sent via Deja.com http://www.deja.com/ Before you buy. === This list is open to everyone. Occasionally, less thoughtful people send inappropriate messages. Please DO NOT COMPLAIN TO THE POSTMASTER about these messages because the postmaster has no way of controlling them, and excessive complaints will result in termination of the list. For information about this list, including information about the problem of inappropriate messages and information about how to unsubscribe, please see the web page at http://jse.stat.ncsu.edu/ ===
Re: Repeated Measures ANOVA
[EMAIL PROTECTED] wrote: Hi. I have conducted an experiment with 4 within subject variables. 1) Colour 2) Shape 3) Pattern 4) Movement Each of these 4 factors have 2 levels so each subject would be exposed to 16 conditions in total. However, I have made each subject do 10 replications per condition and I have 10 subjects so I have a total of 1600 data points. I have tried using SPSS repeated measures in GLM to analyse my data but I don't know how to include my replications. SPSS requires that I select 16 columns of dependant variables each representing a combination of my factors. However, I am only allowed one row per subject, so how do I input the 10 replications that each subject performed for each combination? You have 5 within subject variables. Include a 10 level factor "replication" or use the mean for the 10 replications as the DV (though there are problems with this). Thom === This list is open to everyone. Occasionally, less thoughtful people send inappropriate messages. Please DO NOT COMPLAIN TO THE POSTMASTER about these messages because the postmaster has no way of controlling them, and excessive complaints will result in termination of the list. For information about this list, including information about the problem of inappropriate messages and information about how to unsubscribe, please see the web page at http://jse.stat.ncsu.edu/ ===
Re: Repeated Measures ANOVA
On Tue, 13 Jun 2000 [EMAIL PROTECTED] wrote: Hi. I have conducted an experiment with 4 within subject variables. 1) Colour 2) Shape 3) Pattern 4) Movement Each of these 4 factors have 2 levels so each subject would be exposed to 16 conditions in total. However, I have made each subject do 10 replications per condition and I have 10 subjects so I have a total of 1600 data points. I have tried using SPSS repeated measures in GLM to analyse my data but I don't know how to include my replications. SPSS requires that I select 16 columns of dependant variables each representing a combination of my factors. However, I am only allowed one row per subject, so how do I input the 10 replications that each subject performed for each combination? Thanks ! Alfred Hi Alfred, You might be better off using UNIANOVA for this analysis instead of GLM. For example, here's the GLM syntax for a mixed-design (A and B as between subjects variables; C and D within-subjects): GLM c1d1 c1d2 c2d1 c2d2 c3d1 c3d2 BY a b /WSFACTOR = c 3 Polynomial d 2 Polynomial /METHOD = SSTYPE(3) /CRITERIA = ALPHA(.05) /WSDESIGN = c d c*d /DESIGN = a b a*b . This analysis required the 6 repeated meaures (3*2) to be strung out across one row for each subject. But I was able to produce exactly the same results using 6 rows per subject (one for each of the c*d combinations) and the following syntax: UNIANOVA y BY subj a b c d /RANDOM = subj /METHOD = SSTYPE(3) /INTERCEPT = INCLUDE /EMMEANS = TABLES(OVERALL) /EMMEANS = TABLES(a) /EMMEANS = TABLES(b) /EMMEANS = TABLES(c) /EMMEANS = TABLES(d) /CRITERIA = ALPHA(.05) /DESIGN = a b a*b subj(a*b) c c*a c*b c*a*b c*subj(a*b) d d*a d*b d*a*b d*subj(a*b) c*d c*d*a c*d*b c*d*a*b c*d*subj(a*b). Note that SUBJ is now listed explicitly as one of the variables. And you must explicitly list each of the error terms for within-subjects effects. If you do not list these error terms, a pooled error term is used for tests of the within-subjects effects. Finally, note as well that SUBJ appears on the /Random line; and the nesting of subjects within a*b cells is indicated as subj(a*b). I haven't tried this with a completely within-subjects design. But if you let y=DV a=colour b=shape c=pattern d=movement e = repetition (as suggested by Donald Burril), your syntax should look something like this, I think: UNIANOVA y BY subj a b c d e /RANDOM = subj e /METHOD = SSTYPE(3) /INTERCEPT = INCLUDE /EMMEANS = TABLES(a) /EMMEANS = TABLES(b) /EMMEANS = TABLES(c) /EMMEANS = TABLES(d) /EMMEANS = TABLES(d) /CRITERIA = ALPHA(.05) /DESIGN = a a*subj b b*subj c c*subj d d*subj e e*subj a*b a*b*subj a*c a*c*subj etc... a*b*c*d*e a*b*c*d*e*subj . Your data file would have 2*2*2*2*10 = 160 rows per subject with variables that code for a-e and another for the DV. Hope this helps. Cheers, Bruce -- Bruce Weaver [EMAIL PROTECTED] http://www.angelfire.com/wv/bwhomedir/ === This list is open to everyone. Occasionally, less thoughtful people send inappropriate messages. Please DO NOT COMPLAIN TO THE POSTMASTER about these messages because the postmaster has no way of controlling them, and excessive complaints will result in termination of the list. For information about this list, including information about the problem of inappropriate messages and information about how to unsubscribe, please see the web page at http://jse.stat.ncsu.edu/ ===
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Re: Repeated Measures ANOVA
In article [EMAIL PROTECTED], [EMAIL PROTECTED] (Donald Burrill) wrote: Sounds to me as though you have in fact 5 within-subject variables: the four you list plus 5) Replications (with 10 levels) Of course, this is a random factor, whereas the other four are presumably fixed factors, but presumably there's a way of telling GLM that. snip I believe you (another post comes up with the same solution). Do you have a citation for a book chapter or article that discusses the general issue of replication in repeated measures designs? I'm intrigued about the value of having subjects doing lots of replicate trials. -- Eugene D. Gallagher ECOS, UMASS/Boston -- Eugene D. Gallagher ECOS, UMASS/Boston Sent via Deja.com http://www.deja.com/ Before you buy. === This list is open to everyone. Occasionally, less thoughtful people send inappropriate messages. Please DO NOT COMPLAIN TO THE POSTMASTER about these messages because the postmaster has no way of controlling them, and excessive complaints will result in termination of the list. For information about this list, including information about the problem of inappropriate messages and information about how to unsubscribe, please see the web page at http://jse.stat.ncsu.edu/ ===
