Purpose: The purpose of these four programs is to display the critical values from the chi-squared, f-, t- and z-distributions. The critical values are given for a variety of alpha levels.

Download: You can download this program from within Stata by typingsearch probtabl(see How can I use the search command to search for programs and get additional help? for more information about usingsearch).

Use of program: To use these programs, type one of the following commands in the Stata command window:chitableftablettableztable. A number indicating the desired degrees of freedom can be placed after thechitableandttablecommands. The optionalpha(#)can be added to theftablecommand. There are no options available for theztablecommand.

Examples: The following shows the output from issuing thechitablecommand, which gives the critical values of chi-square for a variety of degrees of freedom and alpha levels.

The following shows the output from issuing the

ftablecommand, which gives the critical values of F for a variety of degrees of freedom at the .05 alpha level.

The following shows the output from issuing the

ttablecommand, which gives the critical values of t for a variety of degrees of freedom at various levels of alpha for both a one- and a two-tailed test.

The following shows the output from issuing the

ztablecommand, which gives the critical values of z.