| Class | Data Declaration command |
| Name | set sex marker |
| Arguments | <locus name> |
Declares a sex-informative marker, such as Amelogenin. This command previously created a quantitative indicator of sex, but this is superceded by the female and male functions.
Example:
>> set locus MID0448z marker . (chr 26) >> set sex marker MID0448z
| << (read plink) | Up to index | >> (set twin) |