****syntax fpr 1 within factor repeated measures****************.
DATASET ACTIVATE DataSet1.
GLM forward backward unrelate nonword
  /WSFACTOR=prime 4 Polynomial 
  /METHOD=SSTYPE(3)
  /PRINT=DESCRIPTIVE ETASQ OPOWER 
  /CRITERIA=ALPHA(.05)
  /WSDESIGN=prime.


GLM forward backward unrelate nonword
  /WSFACTOR=prime 4 special (1 1 1 1
-1 -1 1 1
-1 1 0 0
0 0 -1 1) 
  /METHOD=SSTYPE(3)
  /PRINT=DESCRIPTIVE ETASQ OPOWER 
  /CRITERIA=ALPHA(.05)
  /WSDESIGN=prime.