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In Stata, how do I conduct a Chi-square test with aggregate data?

In Stata, both the .tabulate and .tabi commands conduct the Pearson's Chi-square test. The .tabulate (may be abbreviated as .tab) command produces one- or two-way frequency tables given one or two variables. The commands also can run a Chi-square test using the chi2 option:

. tab grade gender, chi2

The above command will produce a cross-table of grade and gender and its Chi-square statistic.

When you do not have individual data, but only aggregate frequencies, use the .tabi command. You must list the frequencies of each cell with a backward slash ( \ ) to separate a row of a table. Consider the following examples:

. tabi 22 44 \ 34 56, chi2 . tabi 34 45 \ 34 53 \ 34 34, chi2 . tabi 34 45 36 \ 34 64 96, chi2

The first command conducts a Chi-square test for a 2x2 table, while the second and third commands run the test for 3x2 and 2x3 tables, respectively.

If you have questions about using statistical and mathematical software at Indiana University, email UITS Research Analytics (formerly known as the Stat/Math Center). Research Analytics is located on the IU Bloomington campus at Woodburn Hall 200, and is open for consultation by appointment Monday-Friday 9am-5pm. For more, visit Research Analytics on the web, or call 812-855-4724 (IUB) or 317-278-4740 (IUPUI).

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Last modified on August 02, 2013.

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