4/20/2020

Problem Session

• Please volunteer by expressing interest in the chat window
• Chapter 14 Exercises - 14.5, 14.9, 14.11, 14.14, 14.15, 14.17, 14.21, and 14.35

Chapter 15 Nonparametric Statistics

• Two sample shift model - Xs and Ys are simply shifted one direction or the other
• Sign Test - based on the number of positive differences in a matched pairs setting
  • Use SIGN.test(x, md=0) in RStudio #Need BSDA package
  • What distribution does the sign test statistic follow under the null hypothesis?
• Wilcoxon signed-rank test - based on the sum of the ranks of the positive differences
  • Use wilcox.test(x) in RStudio
  • You can also get cumulative probabilities for the signed rank statistic with psignrank(x, n)

Problem session exercises for next time

• Chapter 15 Exercises - 15.3, 15.6, 15. 7, 15.12, 15.15, and 15.17

Please read Sections 15.1 - 15.4 for class on Wednesday.