predict.izip: Model Predictions for a 'iZIP' Object

In thomas-fung/izipr: Interpretable Zero-Inflated Poisson Models in R

Description

This is a function for obtaining predictions and optionally estimates standard errors of those prediction from a fitted iZIP regression object.

Usage

## S3 method for class 'izip'
predict(
  object,
  newdata = NULL,
  se.fit = FALSE,
  type = c("link", "response"),
  ...
)

Arguments

object	an object class 'izip', obtained from a call to glm.izip.
newdata	optionally, a data frame in which to look for variables with which to predict. If omitted, the fitted linear predictors are used.
se.fit	logical; indicating if standard errors are required.
type	the type of prediction required. The default is 'link' which is the scale of the linear predictor i.e., a log scale; the alternative 'response' is on the scale of the response variable. The value of this argument can be abbreviated.
...	other arguments passed to or from other methods (currently unused).

Details

If newdata is omitted the predictions are based on the data used for the fit.

Value

If se.fit = FALSE, a vector of predictions.

If se.fit = TRUE, a list with components

fit	Predictions, as for se.fit = FALSE.
se.fit	Estimated standard errors.

Examples

data(bioChemists)
M_bioChem <- glm.izip(art ~ ., data = bioChemists)

predict(M_bioChem)
predict(M_bioChem, type = "response")
predict(M_bioChem, se.fit = TRUE, type = "response")

newdataframe <- data.frame(
  fem = "Women", mar = "Married", kid5 = 2,
  phd = 3, ment = 8
)
predict(M_bioChem, se.fit = TRUE, newdata = newdataframe, type = "response")

thomas-fung/izipr documentation built on Dec. 23, 2021, 9:57 a.m.