create_ad_group: Generate an artifact distribution object for a dichotomous...

In psychmeta: Psychometric Meta-Analysis Toolkit

Generate an artifact distribution object for a dichotomous grouping variable.

Description

This function generates artifact-distribution objects containing either interactive or Taylor series artifact distributions for dichotomous group-membership variables. Use this to create objects that can be supplied to the ma_r_ad and ma_d_ad functions to apply psychometric corrections to barebones meta-analysis objects via artifact distribution methods.

Allows consolidation of observed and estimated artifact information by cross-correcting artifact distributions and forming weighted artifact summaries.

Usage

create_ad_group(
  ad_type = c("tsa", "int"),
  rGg = NULL,
  n_rGg = NULL,
  wt_rGg = n_rGg,
  pi = NULL,
  pa = NULL,
  n_pi = NULL,
  n_pa = NULL,
  wt_p = n_pi,
  mean_rGg = NULL,
  var_rGg = NULL,
  k_rGg = NULL,
  mean_n_rGg = NULL,
  var_unbiased = TRUE,
  ...
)

Arguments

ad_type	Type of artifact distribution to be computed: Either "tsa" for Taylor series approximation or "int" for interactive.
rGg	Vector of incumbent reliability estimates.
n_rGg	Vector of sample sizes associated with the elements of rGg.
wt_rGg	Vector of weights associated with the elements of rGg (by default, sample sizes will be used as weights if provided).
pi	Vector of incumbent/sample proportions of members in one of the two groups being compared (one or both of pi/pa can be vectors - if both are vectors, they must be of equal length).
pa	Vector of applicant/population proportions of members in one of the two groups being compared (one or both of pi/pa can be vectors - if both are vectors, they must be of equal length).
n_pi	Vector of sample sizes associated with the elements in pi.
n_pa	Vector of sample sizes associated with the elements in pa.
wt_p	Vector of weights associated with the collective element pairs in pi and pa.
mean_rGg	Vector that can be used to supply the means of externally computed distributions of correlations between observed and latent group membership.
var_rGg	Vector that can be used to supply the variances of externally computed distributions of correlations between observed and latent group membership.
k_rGg	Vector that can be used to supply the number of studies included in externally computed distributions of correlations between observed and latent group membership.
mean_n_rGg	Vector that can be used to supply the mean sample sizes of externally computed distributions of correlations between observed and latent group membership.
var_unbiased	Logical scalar determining whether variance should be unbiased (TRUE) or maximum-likelihood (FALSE).
...	Further arguments.

Value

Artifact distribution object (matrix of artifact-distribution means and variances) for use in artifact-distribution meta-analyses.

Examples

## Example artifact distribution for a dichotomous grouping variable:
create_ad_group(rGg = c(.8, .9, .95), n_rGg = c(100, 200, 250),
                mean_rGg = .9, var_rGg = .05,
                k_rGg = 5, mean_n_rGg = 100,
                pi = c(.6, .55, .3), pa = .5, n_pi = c(100, 200, 250), n_pa = c(300, 300, 300),
                var_unbiased = TRUE)
                
create_ad_group(ad_type = "int", rGg = c(.8, .9, .95), n_rGg = c(100, 200, 250),
                mean_rGg = .9, var_rGg = .05,
                k_rGg = 5, mean_n_rGg = 100,
                pi = c(.6, .55, .3), pa = .5, n_pi = c(100, 200, 250), n_pa = c(300, 300, 300),
                var_unbiased = TRUE)

psychmeta documentation built on June 22, 2024, 6:52 p.m.