Chapter 7: One way independent measures ANOVA

  • MS condition=experimental variance

  • MS error= random variance

  • f= MS con/MS error

non-parametric equivalent of ANOVA- Kruskal Wallis (contrast = 3 Mann Whitney U tests)

planned contrasts/post-hoc tests- figuring out which groups differ and how (significance of main effect inferred from ANOVA)

post hoc contrasts

  • assumption of homogeneity violated (Levene’s test=sig)- Games-Howel post hoc test

  • assumption of homogeneity no violated (Levene’s test= not sig)- Bonferroni post hoc test

planned contrasts

  1. deviation

  2. simple (first)

  3. difference

  4. Helmert

  5. Repeated

polynomial contrasts

  • looks for trend of changing scores

  • exists on continuum

    1. linear

    2. quadratic

    3. cubic