lavaan (version 0.5-20)

lav_partable: lavaan partable functions

Description

Utility functions related to the parameter table (partable)

Usage

# extract information from a parameter table
lav_partable_df(partable, group = NULL)
lav_partable_ndat(partable, group = NULL)
lav_partable_npar(partable)
lav_partable_attributes(partable, pta = NULL)
# generate parameter labels
lav_partable_labels(partable, group.equal = "", group.partial = "",  type = "user")
# generate parameter table for specific models
lav_partable_independence(lavobject = NULL, lavdata = NULL, lavoptions = NULL,  lavsamplestats = NULL, sample.cov = NULL, sample.mean = NULL,  sample.th = NULL, sample.th.idx = NULL)
lav_partable_unrestricted(lavobject = NULL, lavdata = NULL, lavoptions = NULL,  lavsamplestats = NULL, sample.cov = NULL, sample.mean = NULL,  sample.th = NULL, sample.th.idx = NULL)
lav_partable_from_lm(object, est = FALSE, label = FALSE, as.data.frame. = FALSE)
# complete a parameter table only containing a few columns (lhs,op,rhs)
lav_partable_complete(partable = NULL, start = TRUE)
# merge two parameter tables
lav_partable_merge(pt1 = NULL, pt2 = NULL, remove.duplicated = FALSE,  fromLast = FALSE, warn = TRUE)

Arguments

partable

A parameter table. see lavParTable for more information.

group

Integer. If non-null, only consider this group.

group.equal

The same options can be used here as in the fitting functions. Parameters that are constrained to be equal across groups will be given the same label.

group.partial

A vector of character strings containing the labels of the parameters which should be free in all groups.

type

Character string. Can be either `user' or `free' to select all entries or only the free parameters from the parameter table respectively.

lavobject

An object of class `lavaan'. If this argument is provided, it should be the only argument. All the values for the other arguments are extracted from this object.

lavdata

An object of class `lavData'. The Data slot from a lavaan object.

lavoptions

A names list. The Options lsot from a lavaan object.

lavsamplestats

An object of class `lavSampleStats'. The SampleStats slot from a lavaan object.

sample.cov

Optional list of numeric matrices. Each list element contains a sample variance-covariance matrix for this group. If provided, these values will be used as starting values.

sample.mean

Optional list of numeric vectors. Each list element contains a sample mean vector for this group. If provided, these values will be used as starting values.

sample.th

Optional list of numeric vectors. Each list element contains a vector of sample thresholds for this group. If provided (and also sample.th.idx is provided), these values will be used as starting values.

sample.th.idx

Optional list of integers. Each list contains the threshold indices for this group.

est

Logical. If TRUE, include the fitted estimates in the parameter table.

label

Logical. If TRUE, include parameter labels in the parameter table.

as.data.frame.

Logical. If TRUE, return the parameter table as a data.frame.

object

An object of class lm.

start

Logical. If TRUE, include a start column, based on the simple method for generating starting values.

pta

A list containing parameter attributes.

pt1

A parameter table.

pt2

A parameter table.

remove.duplicated

Logical. If TRUE, remove duplicated elements when merging two parameter tables.

fromLast

Logical. If TRUE, duplicated elements are considered from the bottom of the merged parameter table.

warn

Logical. If codeTRUE, a warning is produced when duplicated elements are found, when merging two parameter tables.

Examples

# generate syntax for an independence model
HS.model <- ' visual  =~ x1 + x2 + x3
              textual =~ x4 + x5 + x6
              speed   =~ x7 + x8 + x9 '

fit <- cfa(HS.model, data=HolzingerSwineford1939)
lav <- lav_partable_independence(fit)
as.data.frame(lav, stringsAsFactors = FALSE)


# how many free parameters?
lav_partable_npar(lav)

# how many sample statistics?
lav_partable_ndat(lav)

# how many degrees of freedom?
lav_partable_df(lav)