Symmetry and Marginal Homogeneity test for matched samples/ TDT test - --------------------------------------------------------------------
^symmetry^ var_cases var_controls [^if^ exp] [^in^ range] [^,^ ^not^able ^con^ > trib ^ex^act]
Description - -----------
^symmetry^ performs symmetry and marginal homogeneity tests on square NxN tables where there is a 1 to 1 matching of cases and controls (non-independence). In genetics, the test is known as the Transmission/Disequilibrium test (TDT) and is used to test the association between transmitted and non-transmitted parental marker alleles to an affected child.
Options - -------
^notable^ suppresses the output of the contingency table.
^contrib^ reports the contribution of each off-diagonal cell-pair to the overall symmetry chi-square.
^exact^ performs an exact test of table symmetry. CAUTION: the exact test requires substantial amounts of time and memory for large tables.
Examples - --------
. ^symmetry cases controls^ . ^symmetry cases controls, not^ . ^symmetry cases controls, con^ . ^symmetry cases controls, not con^ . ^symmetry cases controls, ex con^
Author - ------
Mario Cleves <mcleves@@stata.com>.
Also see - --------
On-line: @epitab@