predict.gls {nlme} | R Documentation

## Predictions from a gls Object

### Description

The predictions for the linear model represented by `object` are obtained at the covariate values defined in `newdata`.

### Usage

    ## S3 method for class 'gls'
    predict(object, newdata, na.action, ...)

### Arguments

`object` | an object inheriting from class `gls`, representing a generalized least squares fitted linear model.
`newdata` | an optional data frame to be used for obtaining the predictions. All variables used in the linear model must be present in the data frame. If missing, the fitted values are returned.
`na.action` | a function that indicates what should happen when `newdata` contains `NA`s. The default action (`na.fail`) causes the function to print an error message and terminate if there are any incomplete observations.
`...` | some methods for this generic require additional arguments. None are used in this method.

### Value

a vector with the predicted values.

### Author(s)

Jose Pinheiro and Douglas Bates bates@stat.wisc.edu

### See Also

`gls`

### Examples

    fm1 <- gls(follicles ~ sin(2*pi*Time) + cos(2*pi*Time), Ovary,
               correlation = corAR1(form = ~ 1 | Mare))
    newOvary <- data.frame(Time = c(-0.75, -0.5, 0, 0.5, 0.75))
    predict(fm1, newOvary)

[Package nlme version 3.1-105 Index]