functional form of the model can be set to determine age-specific effects and/or age-independent effects, and use age-invariant and/or age-dependent covariates. A weighted model was employed to enable the use of all members of multi-member families (See section 6.1 for a more complete discussion of the DTSA model, and section 6.2 for a detailed description of the method for calculating the weights). The output of a DTSA calculation is the same as the output from a logistic regression calculation.
