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repeated measures in SPSS

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Matt

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Jan 17, 2008, 10:32:16 PM1/17/08
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I have a query about the repeated measures GLM in SPSS

data are thus

r1 duration
r2 duration
r3 duration
r4 duration
r5 duration

each person completes each round (r_) and I want to see if there has
been any effect of round on the recorded duration.

so I do a repeated measures ANOVA with duration as the within subjects
variable.

which says that there is a significant main effect of round

I then want to see if gender exerts any differential effect on the
round by round improvement so in SPSS add gender as a between subjects
factor.

When this happens the previously significant main effect for round is
not significant an longer, and then the round by gender interaction is
also not significant.

can anyone explain why this is occurring? Am I doing this incorrectly

Many thanks in advance

syntax is below

This is for the round effect

GLM
LgDr.0 LgDr.1 LgDr.2 LgDr.3 LgDr.4
/WSFACTOR = duration 5 Polynomial
/METHOD = SSTYPE(3)
/CRITERIA = ALPHA(.05)
/WSDESIGN = duration .

This is to look at the effect of gender

GLM
LgDr.0 LgDr.1 LgDr.2 LgDr.3 LgDr.4 BY Sex
/WSFACTOR = duration 5 Polynomial
/METHOD = SSTYPE(3)
/PLOT = PROFILE( duration*Sex )
/CRITERIA = ALPHA(.05)
/WSDESIGN = duration
/DESIGN = Sex .

Matt

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Jan 17, 2008, 11:56:32 PM1/17/08
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Please disregard this post

The problem has been sorted

Thanks

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