logitnnr | R Documentation |
Link function for logistic regression models with a (fixed/known) natural non-response parameter.
logitnnr(nnrp = 0)
nnrp |
Natural non-response parameter in [0,1). |
The logit link function with a natural non-response parameter is defined as log[E(Y) / (1 - \pi - E(Y))]
and inverse link function E(Y) = (1 - \pi)/(1 + exp(-\eta))
, where 0 \le \pi < 1
is the natural non-response parameter. Note that the usual logit link function is a special case where \pi = 0
. The link function implies an upper asymptote of 1 - \pi
for E(Y)
as \eta
approaches infinity.
User-specified starting values for the regression parameters may be required in cases where \pi
is substantially larger than zero. One strategy is to obtain these from a model with a smaller value of \pi
logitnr
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