predict.psFit {fitPS}

S3 predict method for an object of class psFit

Description

S3 predict method for an object of class psFit

Usage

## S3 method for class 'psFit'
predict(
  object,
  newdata,
  interval = c("none", "prof", "wald"),
  level = 0.95,
  ...
)

Arguments

object

an object of class psFit, usually from fitDist or fitZIDist.

newdata

an optional vector of integers at which to calculate \Pr(X = x).

interval

either "none", "prof", or "wald" and can be abbreviated. If "prof" or "wald" AND the zeta model has been used then an interval, based on the bounds of a 100 * level confidence interval for the shape parameter, is given for each predicted probability. The interval is provided based on either a Profile Likelihood, or a Wald, confidence interval for the shape, and therefore cannot really be regarded as a confidence interval for the probabilities. The intervals might be more sensibly regarded as a measure of how sensitive the probabilities are to the choice of shape parameter. NOTE: this parameter is ignored if the Zero-inflated (ZIZ) model has been used.

level

the level of a confidence interval. Ignored if interval == "none".

...

other arguments passed to predict—not used

Value

either a named vector of fitted probabilities, or a data.frame with columns predicted, lower, and upper and the row names set to show what terms are being calculatd

Examples

data(Psurveys)
roux = Psurveys$roux
fit = fitDist(roux)
predict(fit, interval = "prof")