how to create a special contrast

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lisakloft
Posts: 1
Joined: Mon Dec 12, 2011 11:34 am

how to create a special contrast

Postby lisakloft » Mon Dec 12, 2011 11:52 am

hello, I want to run a special contrast for a 2 (sacc) x 4 (cond) repeated ANOVA using SPSS 17. more specifically, I want to compare different "cond" levels between the factor "sacc" (1st comparison: hori_AS_offset vs. hori_SVS_offset, 2nd comparison: verti_AS vs. verti_SVS, 3rd comparison: transf_AS vs. trans_SVS)

this is how my syntax looks like:
GLM hori_AS_standard hori_AS_offset verti_AS transf_AS hori_SVS_standard hori_SVS_offset verti_SVS trans_SVS
/WSFACTOR=sacc 2 POLYNOMIAL cond 4 POLYNOMIAL
/CONTRAST(cond)=SPECIAL(0 1 0 0 0 -1 0 0, 0 0 1 0 0 0 -1 0, 0 0 0 1 0 0 0 -1)
/METHOD=SSTYPE(3)
/EMMEANS = TABLES(cond*sacc) COMPARE(sacc) ADJ(BONFERRONI)
/EMMEANS = TABLES(cond*sacc) COMPARE(cond) ADJ(BONFERRONI)
/PRINT=DESCRIPTIVE
/CRITERIA=ALPHA(.05).

however, SPSS says that the subcommand contrast was invald because instead of cond a factor name was expected?!

can someone please help me? thanks!

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