Purpose: The purpose of this program is to display a
t-distribution and a standard normal distribution for the number of degrees of
freedom specified by the user.Download: You can download this program from within Stata by
typing search tdemo (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 tdemo in the
Stata command window. This opens a Stata graph window showing a
t-distribution with one degree of freedom in red and a normal distribution in
blue. If a number is typed after the tdemo command, a
t-distribution with that number of degrees of freedom will be displayed.Examples: The following shows the output from issuing the tdemo
command with degrees of freedom value of 5.
. tdemo 5
The following shows the output from issuing the tdemo command with a
degrees of freedom value of 5 and 1-tail rejection region.
. tdemo 5 1
The next example shows the output from issuing the tdemo command with a
degrees of freedom of 5, a 1-tail rejection region wit alpha at .01.
. tdemo 5 2 .01
