The FAMILY Procedure

The XLVAR statement identifies the variables containing either the X-linked marker alleles or, if GENOCOL is specified, genotypes. By default, the XLVAR statement should contain 2 variable names, where is the number of X-linked markers in the data set. Note that variables containing alleles for the same marker should be listed consecutively. The second allele variable for males in the data set must be nonmissing but is ignored since males have only one allele at markers on the X-chromosome. When GENOCOL is specified, there should be one variable per marker. When X-linked markers are analyzed, there must be a SEX variable in the data set indicating whether individuals are male (1 or "M") or female (2 or "F"). If this variable is named something other than SEX, the /SEX=variable option must be added to the XLVAR statement in order to indicate the name of the variable containing individuals’ sex. See X-Linked Version of Tests for more information about X-linked tests.