semhelpinghands (version 0.1.14)

show_cfi: Visualize How CFI and TLI Are Computed

Description

Show how CFI and TLI are computed using a graph of model chi-square vs. model degrees of freedom.

Usage

show_cfi(fit, ...)
show_tli(fit, ...)
show_ifi(fit, fit_measures = c("cfi", "tli"), test = c("standard"))

Value

An output of ggplot2::ggplot() that can be further modified.

Arguments

fit

An output of lavaan::lavaan() or its wrappers (e.g., lavaan::cfa() and lavaan::sem()).

...

Arguments to be passed to show_ifi().

fit_measures

The fit measures to be plotted. Acceptable values are "cfi" and "tli".

test

The type of model chi-square test. It corresponds to the test argument of lavaan::lavaan() or its wrappers. Only "standard" is supported for now.

Functions

• show_cfi(): A wrapper of show_ifi() with fit_measures = "cfi".

• show_tli(): A wrapper of show_ifi() with fit_measures = "tli".

Author

Shu Fai Cheung https://orcid.org/0000-0002-9871-9448

Details

This function receives an output of lavaan::lavaan() or its wrappers (e.g., lavaan::cfa() and lavaan::sem()) and illustrates how CFI is computed.

Examples

library(lavaan)

# From the help page of lavaan::cfa().

HS.model <- '
visual  =~ x1 + x2 + x3
textual =~ x4 + x5 + x6
speed   =~ x7 + x8 + x9
'
fit <- cfa(HS.model, data = HolzingerSwineford1939)

# By default show how CFI is computed
show_ifi(fit)

# Show how TLI is computed
show_ifi(fit, fit_measures = "tli")

# Wrappers
show_cfi(fit)
show_tli(fit)