4/22/2020

Problem Session

• Please volunteer by expressing interest in the chat window
• Chapter 15 Exercises - 15.3, 15.6, 15. 7, 15.12, 15.15, and 15.17

Chapter 15 Nonparametric Statistics

• Wilcoxon Rank Sum Statistic
  • wilcox.test(x,y) in RStudio
• Mann-Whitney U Statistic
  • Equivalent to Wilcoxon rank sum statistic
  • You can also use wilcox_test(x, y) #Need the coin package, provides exact conditional test
• Kruskal-Wallis Test for One-Way ANOVA
  • kruskal.test(x, g) #g is a grouping variable, so you need to put the data into long form

Problem session exercises for next time

• Chapter 15 Exercises - 15.22, 15.25, 15.27, 15.32, and 15.33

Please read Sections 15.5 - 15.7 for class on Friday.