* do-file for Supplementary Exercises 7.143 and 7.145
version 17 /* works also with versions 13-16 */

import delimited "R:\Chapter 7\ex07_143.csv", clear
summarize oc, detail
stem oc
qnorm oc
swilk oc
ci oc

* same thing for the log-transformed values (loc)
* to generate these directly from the oc values, use
*   generate loc=ln(oc)
import delimited "R:\Chapter 7\ex07_145.csv", clear
summarize loc, detail
stem loc
qnorm loc
swilk loc
ci loc