datagen_uni: Unidimensional data generation.

In MIRES: Measurement Invariance Assessment Using Random Effects Models and Shrinkage

Description

Generates unidimensional data for testing the HMRE/MIRES approach.

Usage

datagen_uni(J, K, n, fixed, mipattern, etadist = NULL)

Arguments

J	Integer. Number of indicators.
K	Integer. Number of groups.
n	Integer. Number of observations within group.
fixed	Named List. lambda, resid_log, nu, in that order.
mipattern	List. See details.
etadist	(Default: NULL). NULL, "std", or a list of two. If NULL (Default), all groups have latent scores distributed standard normal. If "std", means are standard normal, and (log) latent SDs are also standard normal (i.e., standard log normal; product to 1). If a list, slot one provides the K means, slot two provides the K log SDs. These should have a mean of zero (sum to zero) and a mean of 1 (product to 1), respectively.

Details

mipattern is a list specifying a pattern of MI. The first entry should be a string specifying one of: constant, random, none, items, params, or custom. The other entries depend on the specification desired, as described below.

constant

(2) Numeric: All RE SDs are set to this value.

random

(2) Numeric: All RE SDs are generated between 0 and this value.

none

All RE SDs set to zero (full invariance).

items

(2) Numeric: Value of RE SDs for (3) items. E.g., "items", .4, 4 would set all parameters for items 1 to 4 to have an RE SD of .4.

params

(2) Numeric: Value of RE SD for parameter type (3), where (3) is an integer (0: Loadings, 1: Residual SDs, 2: Intercepts). E.g., "params", .4, 2 would set all RE-SDs of intercepts to be .4.

custom

(2) Numeric: Specify all 3J RE-SDs manually in order of loadings, residual log SDs, and intercepts.

Note that this is not the generative model specified by MIRES, but a convenience function for meeting the bare assumptions while generating MI or non-MI data.

Value

List of meta(data), params, data, and a data frame.

Author(s)

Stephen Martin

MIRES documentation built on Feb. 22, 2021, 5:10 p.m.