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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)
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