update.mplusObject {MplusAutomation}

Update an Mplus model object

Description

This is a method for updating an Mplus model object. It takes an Mplus model object as the first argument, and then optionally any sections to update. There are two ways to update a section using a formula interface. ~ "new stuff" will replace a given section with the new text. Alternately, you can add additional text using ~ + "additional stuff". Combined these let you replace or add to a section.

Usage

## S3 method for class 'mplusObject'
update(object, quiet = TRUE, ...)

Arguments

object

An object of class mplusObject

quiet

optional. If TRUE, show status messages in the console.

...

Additional arguments to pass on

Value

An (updated) Mplus model object

Author(s)

Joshua F. Wiley <[e-mail]>

Examples

example1 <- mplusObject(MODEL = "mpg ON wt;",
  usevariables = c("mpg", "hp"), rdata = mtcars)
x <- ~ "ESTIMATOR = ML;"
str(update(example1, rdata = iris))
str(update(example1, ANALYSIS = x))
str(update(example1, MODEL = ~ "wt ON hp;"))
str(update(example1, MODEL = ~ . + "wt ON hp;"))
str(update(example1, ANALYSIS = x, MODEL = ~ . + "wt ON hp;"))

## check that use variables can be updated & overridden
str(update(example1, usevariables = c("mpg", "hp", "cyl")))

# test to make sure . in Mplus code does not cause problems
str(update(example1, ANALYSIS = x, MODEL = ~ . + "wt ON hp*.5;"))
rm(example1, x)