* do-file for Extra Exercise 21
version 17 /* works also with versions 13-16 */

import delimited R:\Extra\anscombe.csv
* regressions
regress y1 x1_3
regress y2 x1_3
regress y3 x1_3
regress y4 x4
* correlations
pwcorr x1_3 y1 y2 y3 x4 y4
* scatterplots
twoway (scatter y1 x1_3) (lfit y1 x1_3)
twoway (scatter y2 x1_3) (lfit y2 x1_3)
twoway (scatter y3 x1_3) (lfit y3 x1_3)
twoway (scatter y4 x4) (lfit y4 x4)