Extract the trajectories

Source: R/generics.R, R/trajectories.R, R/model.R

Transform or extract the trajectories from the given object to a standardized format.

The standardized data format is for method estimation by latrend, and for plotting functions.

trajectories(
  object,
  id = idVariable(object),
  time = timeVariable(object),
  response = responseVariable(object),
  ...
)

# S4 method for data.frame
trajectories(
  object,
  id = idVariable(object),
  time = timeVariable(object),
  response = responseVariable(object),
  ...
)

# S4 method for matrix
trajectories(
  object,
  id = idVariable(object),
  time = timeVariable(object),
  response = responseVariable(object),
  ...
)

# S4 method for call
trajectories(object, ..., envir)

# S4 method for lcModel
trajectories(
  object,
  id = idVariable(object),
  time = timeVariable(object),
  response = responseVariable(object),
  ...
)

Arguments

object

The data or model or extract the trajectories from.

id

The identifier variable name, see idVariable.

time

The time variable name, see timeVariable.

response

The response variable name, see responseVariable.

...

Not used.

envir

The environment used to evaluate the data object in (e.g., in case object is of type call).

Value

A data.frame with columns matching the id, time, and response name arguments.

Details

The generic function removes unused factor levels in the Id column, and any trajectories which are only comprised of NAs in the response.