* This syntax will produce multiple multi-line graphs to illustrate the various types of ANOVA interaction.

* No main effects, no interaction.
* Note that SPSS exaggerates the Y axis by default on this graph, to imply differences.
GRAPH  /LINE(MULTIPLE)MEAN(DV1) BY IV1 BY IV2 .

* Main effect IV1, no main effect IV2, no interaction.
GRAPH  /LINE(MULTIPLE)MEAN(DV2) BY IV1 BY IV2 .

* No main effect IV1, main effect IV2, no interaction.
GRAPH /LINE(MULTIPLE)MEAN(DV3) BY IV1 BY IV2 .

* Main effect IV1, main effect IV2, interaction. 
GRAPH /LINE(MULTIPLE)MEAN(DV4) BY IV1 BY IV2 .

* No main effect IV2, no main effect IV2, interaction.
GRAPH /LINE(MULTIPLE)MEAN(DV5) BY IV1 BY IV2 .

* Main effect IV1, main effect IV2, no interaction.
GRAPH /LINE(MULTIPLE)MEAN(DV6) BY IV1 BY IV2. 

* No main effect IV1, main effect IV2, interaction.
GRAPH /LINE(MULTIPLE)MEAN(DV7) BY IV1 BY IV2 .

* Main effect IV1, no main effect IV2, interaction.
GRAPH /LINE(MULTIPLE)MEAN(DV8) BY IV1 BY IV2 .