README.md

In nietsnel/psindex: Parameter Stability Index

Overview

psindex is a wrapper package for lavaan that evaluates parameter estimate stability. The psindex allows for a comparison between model maximum likelihood estimates and other alternative estimates that similarly describe the model (i.e., fungible estimates). The ranges of these alternative estimates allow for an examination of uncertainty in ones results.

Installation

# Install from GitHub
# install.packages("devtools")
devtools::install_github("nietsnel/psindex")

Usage

To start using psindex, the following example allows for the examination of uncertainty in the Political Democracy dataset referenced in Bollen's 1989 text (p. 324)

library(psindex)
model_original <-
'# measurement model
ind60 =~x1 + x2 + x3
dem60 =~y1 + y2 + y3 + y4
dem65 =~y5 + y6 + y7 + y8
# regressions
dem60∼ind60
dem65∼ind60 + dem60
# residual correlations
y1~~y5
y2~~y4 + y6
y3~~y7
y4~~ y8
y6~~y8
'

ps_index(model = model_original, data_set = PoliticalDemocracy,
         RMSEA_pert = .005,
         plot_fpe =  TRUE, output_long = FALSE,
         frac_plot = .3, iterations_bin = 100000,
         control_genSA = list(threshold.stop = 1e-13, max.time = 600))

Reference

Prendez, J. Y., & Harring, J. R. (2019). Measuring Parameter Uncertainty by Identifying &nbsp Fungible Estimates in SEM. Structural Equation Modeling: A Multidisciplinary Journal, 0(0), 1–12. https://doi.org/10.1080/10705511.2019.1608550

nietsnel/psindex documentation built on June 22, 2019, 10:56 p.m.