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Repeated Measures ANOVA

Repeated Measures ANOVA. Rogaine for Hair Growth in Women V.H. Price and E. Menefee (1990). “Quantitative Estimation of Hair Growth I. Androgenic Alopecia in Women: Effect of Minoxidil,” The journal of Investigative Dermatology , Vol.95, pp.683-687. Data Description.

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Repeated Measures ANOVA

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  1. Repeated Measures ANOVA Rogaine for Hair Growth in Women V.H. Price and E. Menefee (1990). “Quantitative Estimation of Hair Growth I. Androgenic Alopecia in Women: Effect of Minoxidil,” The journal of Investigative Dermatology, Vol.95, pp.683-687

  2. Data Description • Subjects: 8 Women with Androgenetic Alopecia • Treatments: Minoxidil (Rogaine) and Placebo (4 Women per treatment) • Time Periods: Measurements made Pre-treatment (0 weeks), 8, 16, 24, and 32 weeks (will only consider post-treatment measures)

  3. Data

  4. Statistical Model

  5. Sums of Squares

  6. ANOVA Table/F-Tests Note: We cannot conclude any treatment or time effects or interaction at the 0.05 significance level. The subject-to-subject variation is very large, which makes finding a treatment effect very difficult in this setting (and very few subjects as well)

  7. Post-Hoc comparisons* * Bonferroni’s method for illustration only (no significant effects found from Analysis of Variance)

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