* do-file for Extra Exercise 8
version 17 /* works also with versions 13-16 */

* (a) normal distribution
clear
set seed 140919
set obs 100
generate var1=rnormal()
generate var2=rnormal()
generate var3=rnormal()
summarize, detail
histogram var1, normal
histogram var2, normal
histogram var3, normal
qnorm var1
qnorm var2
qnorm var3
swilk var1 var2 var3

* (b) uniform distribution
clear
set seed 140919
set obs 100
gen var1=uniform()
gen var2=uniform()
gen var3=uniform()
summarize, detail
histogram var1, normal
histogram var2, normal
histogram var3, normal
qnorm var1
qnorm var2
qnorm var3
swilk var1 var2 var3