version 10.0
log using chap01, replace
use cps_small, clear
*--------------------------------------------------------------
* this is a comment

* these commands presume you have changed to the working 
* directory

* use the clear option if previous work in memory can be erased
*--------------------------------------------------------------
summarize
summarize wage, detail
summarize if exper >= 10
summarize in 1/50
summarize wage in 1/50, detail
summarize wage if female == 1 in 1/500, detail
histogram wage, percent title(Histogram of wage data)
more

*------------------------------------------------------
* the above command -more- causes execution of
* the Do-file to pause so that the histogram can
* be inspected before the next command is carried out
* Press the space bar to continue
*------------------------------------------------------

* Computing normal probabilities
scalar phi = normal(1.27)
di phi
display phi
display "Prob (Z <= 1.27) = " phi
di "Prob (Z <= 1.27) = " phi
di "Prob (Z <= 1.27) = " normal(1.27)

* Computing p-values
scalar p = ttail(20,1.27)
di "Prob (t(20) > 1.27) = " p
di "Prob (t(20) > 1.27) = " ttail(20,1.27)

* Computing critical values
scalar z = invnormal(.90)
di "90th percentile value of standard normal " z
scalar t = invttail(20,.10)
di "90th percentile value of t(20) distribution " t

log close