Sib-pair Command: set prevalence

Class	Analysis and data manipulation command
Name	set prevalence
Arguments	<prevalence> | off

Sets (or unsets) the "population prevalence" of a binary trait. This is currently used by the assoc command to calculate penetrances, attributable risks and sibling recurrence risks for each marker locus versus a binary trait.

Obviously, to calculate stratified results, for age as an example, one has to create traits encoding the binary trait in each stratum, and reset the prevalence appropriately for each subanalysis.

Example:

>> include frenchad.in
>> set prev 0.05

Binary trait model prevalence = 0.050000

>> set ple 1
>> association ad genotypic

See also:

assoc

allelic/genotypic association with a trait