wsMed (version 1.0.2)

calc_basic_contrasts: Basic Contrasts for Indirect Effects and Pre/Post Path Coefficients

Description

calc_basic_contrasts() extracts two convenient sets of contrasts from a Monte-Carlo SEM result (semmcci object):

1. All pairwise differences between indirect effects (indirect_* columns);

2. Pre-test (\(X_0\)) and post-test (\(X_1\)) coefficients for every primary \(b\) path, obtained with \(X_1 = (2b + d)/2\), \(X_0 = X_1 - d\).

Usage

calc_basic_contrasts(mc_result, ci_level = 0.95, digits = 3)

Value

A list with up to two data frames:

IE_contrasts

Pairwise contrasts of indirect effects, or NULL if fewer than two are present.

Xcoef

Rows X1_b* and X0_b* for every detected \(b\) path, or NULL if no \(b\) path is found.

Arguments

mc_result

A Monte-Carlo result of class "semmcci" (returned by MCMI2()).

ci_level

Confidence level for the CI (default 0.95).

digits

Decimal places to keep (default 3).

Details

• Indirect-effect columns are detected by the regular expression ^indirect_.

• A primary \(b\) path is any coefficient named b1, b_1_2, … Its matching \(d\) path (d1, d_1_2, …) is paired automatically.

Each contrast is summarised with its Monte-Carlo mean, SD, and a symmetric \(100(1-\alpha)\) % confidence interval. Helper functions mc_summary_pct() and fix_pct_names() ensure that the final CI columns are named, for example, 2.5%CI.Lo and 97.5%CI.Up.