version 10
clear

cd c:\data\stata
use http://www.learneconometrics.com/class/stata/caschool, clear
describe
summarize
label variable str "Student to teacher ratio"
summarize str if testscr>=650
scalar mean1 = r(mean)
di "average str above testscr=650 is " mean1
summarize str if testscr<650
scalar mean2 = r(mean)
di "average str below testscr=650 is " mean2

histogram testscr, normal

use http://www.learneconometrics.com/class/stata/macro_2e, clear
tsset time
gen lp = log(punew)
gen infl = D.lp
summarize
tsline infl
summarize infl, detail
di "Inflation peak"
list time infl if (infl == r(max))
di "Inflation trough"
list time infl if (infl == r(min))

use http://www.learneconometrics.com/class/stata/fatality, clear
summarize
xtset state year
histogram vmiles, normal
more
histogram vmiles, normal kdensity
more 
by year, sort : summarize beertax