# Special Designs in Manova - PowerPoint PPT Presentation

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## Special Designs in Manova

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### Univariate (if single DV or two-level w/s factor) Both SINGLEDF and ... But do not use simple effects as 'follow-ups' to interactions; use them instead. 33 ... – PowerPoint PPT presentation

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Title: Special Designs in Manova

1
Special Designs in Manova
• Contrasts
• Simple Effects
• Doubly Multivariate Designs

2
Contrasts
• Between-subjects contrasts can be
• Univariate (if single DV or two-level w/s factor)
• Both SINGLEDF and PARAM(ESTIM) show them
• Multivariate (if 2 DVs or more-level w/s
factor)
• Only SINGLEDF shows the discriminant functions
• Within-subject contrasts are either univariate
differences (k 2) or single discriminant
functions of multivariate contrasts analyzed
simultaneously (e.g., LIN, QUAD).

3
Simple Effects
• When the hypothesis requires it
• When the meaning of a factor discourages
averaging across levels of that factor
• E.g., no-caffeine control vs. experimental groups
receiving caffeine random sample of controls vs.
criminal sociopaths
• What kind of population would that generalize to?
• When n-way interaction is too difficult to
interpret
• But do not use simple effects as follow-ups to
interactions use them instead.

4
Interactions
1_23 x LIN, 1_23 x QUAD,2_3 x LIN, 2_3 x QUAD
MANOVA DV by G(1,3) T(1,3)
5
Simple Effects
G1 x LIN, G1 x QUAD,G2 x LIN, G2 x QUAD, G3 x
LIN, G3 x QUAD

6
SPSS Rules
• Simple effects are requested in the /DESIGN (b/s)
or /WSDESIGN (w/s) command
• Only one type (b/s vs. w/s) can be requested at
one time, though multiple versions. Effects of
the other type are crossed with the specified
simple effects)
• MWITHIN A(k) defines levels within which effects
of the other type are run
• A WITHIN B(k) defines one factor within levels of
another
• /DESIGN commands are considered exhaustive no
other effects are tested. /WSDESIGN tests are
automatically crossed with any between-subjects
factor.

L15.html
7
Doubly Multivariate Designs
• Two sources of multivariateness
• W/S factors with 2 levels
• More than one DV (measure) per W/S cell
• Example RTs and errors across 3 trials

TRIAL1 TRIAL2 TRIAL3
L15.html
8
Multiple-Measure W/S Designs
• W/S factors with 2 levels (univariate), but
multivariateness due to more than one DV
(measure) per W/S cell
• Example HR and SC within a 2 x 2 design

L15.html
9
Covariates
• MANOVA DV by G(1,3) WITH COV
• /METHOD SEQU
• L12_covariates.html

COMPUTE C2 C MANOVA X1 X2 by G(1,3) WITH C C2
/WSFACT RETEST(2) /METHOD SEQU
10
(No Transcript)