WSDESIGN Subcommand (MANOVA: Repeated Measures command)

WSDESIGN specifies the design for within-subjects factors. Its specifications are like those of the DESIGN subcommand, but it uses the within-subjects factors rather than the between-subjects factors.

  • The default WSDESIGN is a full factorial design, which includes all main effects and all interactions for within-subjects factors. The default is in effect whenever a design is processed without a preceding WSDESIGN or when the preceding WSDESIGN subcommand has no specifications.
  • A WSDESIGN specification can include main effects, factor-by-factor interactions, nested terms (term within term), terms using the keyword MWITHIN, and pooled effects using the plus sign. The specification is the same as on the DESIGN subcommand but involves only within-subjects factors.
  • A WSDESIGN specification cannot include between-subjects factors or terms based on them, nor does it accept interval-level variables, the keywords MUPLUS or CONSTANT, or error-term definitions or references.
  • The WSDESIGN specification applies to all subsequent within-subjects designs until another WSDESIGN subcommand is encountered.

Example

MANOVA JANLO,JANHI,FEBLO,FEBHI,MARLO,MARHI BY SEX(1,2)
  /WSFACTORS MONTH(3) STIMULUS(2)
  /WSDESIGN MONTH, STIMULUS
  /WSDESIGN
  /DESIGN SEX.
  • There are six dependent variables, corresponding to three months and two different levels of stimulus.
  • The dependent variables are named on the MANOVA variable list in such an order that the level of stimulus varies more rapidly than the month. Thus, STIMULUS is named last on the WSFACTORS subcommand.
  • The first WSDESIGN subcommand specifies only the main effects for within-subjects factors. There is no MONTH by STIMULUS interaction term.
  • The second WSDESIGN subcommand has no specifications and, therefore, invokes the default within-subjects design, which includes the main effects and their interaction.