SurvFn.ku: The cumulative survival distribution function for 4-parameter vitality model
Description
Gives the cumulative survival proportions at xx
for a given set of parameter values.
Usage
SurvFn.ku(xx, r, s, k, u)
Value
cumulative survival proportions at xx
Details
Used within vitality.ku
for estimating model parameters based on the observed cumulative survival function.