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Repeated Measures ANOVA

This study examines the effect of Minoxidil (Rogaine) on hair growth in women with androgenetic alopecia. Measurements were taken at various time periods to analyze the treatment's efficacy. The results indicate no significant treatment or time effects, possibly due to subject-to-subject variation and a small sample size.

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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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