* do-file for Exercise 27.19 of PSLS 3e
version 15 /* works also with versions 13-14 */

import delimited "R:\Chapter 27\ex27_019.csv"
summarize pctn, detail
stem pctn
* test of symmetry (skewness=0)
sktest pctn
* Wilcoxon signed rank test (1-sample)
signrank pctn=78.1
* confidence interval for the median
centile pctn, centile(50)
* sign test (1-sample)
signtest pctn=78.1