week 9 - Factorial Anova 3

Introduction to simple effect

• after we have a significant interaction

• simple effect of one IV at one level of the other IV

Simple effect sum of squares

Simple effect in stata

• contrast IV1@IV2, effects mcompare(method)

• pwcompare IV1#IV2, effects mcompare(method)

  • compare all possible pairs of cell means

  • can

• contrast a.IV1@IV2, effects mcompare (bon) (adjacent)

• pvalues highlight if they are statistically significant

• if the CI involves 0 that makes it not significant

Follow up on a sig. main effect

• if the factor of the main effect has more than 2 levels

  • contrast IV1, effects mcompare(method)

  • pwcompare IV1 , effects mcompare(method)

    • the IV is stat sig IV at 2 levels