2-WAY Repeated measures ANOVA-POST HOC ANALYSIS IN SPSS

[Valerie Guille-2]

Hey all,

I am hoping that someone will be able to help me here.

1st a brief info about my dataset: I have 2 groups of independent
subjects (1st group receive Placebo and 2nd group receive a treatment)
in which 3  response from 3 different types of stimuli are measured.

I believed I need to run a repeated measures ANOVA with the 3 response
the RM. I run a the following analysis in SPSS:

GLM
  PPI4 PPI8 PPI16 BY TTT_Code
  /WSFACTOR = PPI 3 Polynomial
  /CONTRAST (TTT_Code)=Simple(1)
  /METHOD = SSTYPE(3)
  /POSTHOC = TTT_Code ( LSD BONFERRONI )
  /EMMEANS = TABLES(TTT_Code) COMPARE ADJ(BONFERRONI)
  /EMMEANS = TABLES(PPI) COMPARE ADJ(BONFERRONI)
  /EMMEANS = TABLES(TTT_Code*PPI)
  /PRINT = DESCRIPTIVE ETASQ OPOWER HOMOGENEITY
  /CRITERIA = ALPHA(.05)
  /WSDESIGN = PPI
  /DESIGN = TTT_Code .

SPSS does not run the posthoc analysis on these data because I only have
2 groups. I would like to be able to compare my groups within each of my
responses (i.e. PPI4, PPI8 and PPI16).
I would greatly appreciate, if someone could help me with the commande I
need to add in the above syntax in order to do this.


Thanks in advance.
Valerie

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[Zdaniuk, Bozena-2]

Hello, you need to change your syntax a bit. Change your
  /EMMEANS = TABLES(TTT_Code) COMPARE ADJ(BONFERRONI)
  /EMMEANS = TABLES(PPI) COMPARE ADJ(BONFERRONI)
  /EMMEANS = TABLES(TTT_Code*PPI)

to
  /EMMEANS = TABLES(TTT_Code) COMPARE (TTT_Code) ADJ(BONFERRONI)
  /EMMEANS = TABLES(PPI) COMPARE (PPI)  ADJ(BONFERRONI)
  /EMMEANS = TABLES(TTT_Code*PPI) COMPARE (TTT_Code)
  /EMMEANS = TABLES(TTT_Code*PPI) COMPARE (PPI)

This will give you all the comparisons you want. And I would not bother with ADJ subcommand - it does not work in SPSS (at least I never saw it making any adjustments).
Also, you may want to think whether you really have a RM design or just a multivariate ANOVA. Repeated measures analysis usually means that you measured people on the same thing multiple times. But arent' you saing that you have three measures of responses to three DIFFERENT stimuli?
Just a thought.
Bozena Zdaniuk



________________________________________
From: SPSSX(r) Discussion [[hidden email]] On Behalf Of Valerie Guille [[hidden email]]
Sent: Sunday, June 29, 2008 10:07 PM
To: [hidden email]
Subject: 2-WAY Repeated measures ANOVA-POST HOC ANALYSIS IN SPSS

Hey all,

I am hoping that someone will be able to help me here.

1st a brief info about my dataset: I have 2 groups of independent
subjects (1st group receive Placebo and 2nd group receive a treatment)
in which 3  response from 3 different types of stimuli are measured.

I believed I need to run a repeated measures ANOVA with the 3 response
the RM. I run a the following analysis in SPSS:

GLM
  PPI4 PPI8 PPI16 BY TTT_Code
  /WSFACTOR = PPI 3 Polynomial
  /CONTRAST (TTT_Code)=Simple(1)
  /METHOD = SSTYPE(3)
  /POSTHOC = TTT_Code ( LSD BONFERRONI )
  /EMMEANS = TABLES(TTT_Code) COMPARE ADJ(BONFERRONI)
  /EMMEANS = TABLES(PPI) COMPARE ADJ(BONFERRONI)
  /EMMEANS = TABLES(TTT_Code*PPI)
  /PRINT = DESCRIPTIVE ETASQ OPOWER HOMOGENEITY
  /CRITERIA = ALPHA(.05)
  /WSDESIGN = PPI
  /DESIGN = TTT_Code .

SPSS does not run the posthoc analysis on these data because I only have
2 groups. I would like to be able to compare my groups within each of my
responses (i.e. PPI4, PPI8 and PPI16).
I would greatly appreciate, if someone could help me with the commande I
need to add in the above syntax in order to do this.


Thanks in advance.
Valerie

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