Purpose: The purpose of this program is to show a standard
normal distribution given the probability and the number of tails (either one or
two) specified by the user. The value of z is also displayed.Download: You can download this program from within Stata by
typing search ztail (see
How can I used the search command to search for programs and get additional
help? for more information about using search).
Use of program: To use this program, type ztail # # in the Stata command window
where the first number indicates the probability (for example, .05) and the
second number indicates the number of tails (either one or two). Vertical
lines are drawn to indicate the tails.Examples: The following example uses a probability of .05
and requests a one-tailed test. The resulting z-score is 1.645 and is
indicated by the vertical line at that value of z.
. ztail .05 1
This example also uses a probability of .05 but requests a two-tailed
test. The vertical lines at -1.96 and +1.96 indicate the z-scores.
. ztail .05 2
