ltgsmd-package: ltgsmd: Latent True-Score and Target-Population Anchored...

In ltgsmd: Latent True-Score and Target-Population Anchored Geometric SMD

ltgsmd: Latent True-Score and Target-Population Anchored Geometric SMD

Description

Implements the LTG-SMD framework for two-group effect-size analysis. The LTG-SMD is a standardized mean difference whose denominator is the geometric mean of group-specific true-score standard deviations in an explicitly chosen target reference population. The package supports single-study analyses with internal holdout references, analyses with external norm samples, and multi-site coordinated-replication analyses with cross-site pooled references.

Core functions

compute_ltg_smd()

Compute the LTG-SMD and four conventional comparators (Hedges's g, Welch-type SMD, observed geometric SMD, external observed SMD) from study and reference data.

ltg_smd_ci()

Analytic delta-method and bias-corrected (BC) or BCa nonparametric bootstrap confidence intervals.

denominator_diagnostics()

Table F.1 diagnostics for reporting (Section 8.3 of the paper).

denominator_sensitivity()

Profile across six symmetric denominators (Simulation D; Section 5.3 of the paper).

sensitivity_reference()

Sensitivity to the choice of target reference.

multisite_ltg_smd()

Multi-site analysis with cross-site pooled reference and meta-analytic comparison.

export_supplementary()

Bundle diagnostics, CIs, and sensitivity profiles for a supplementary appendix.

Companion paper

Nakamura, D. (2026). The denominator chooses the estimand: A target-population true-score framework for standardized mean differences. Psychological Methods. Advance online publication. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1037/met0000875")}

Run citation("ltgsmd") for this reference in text and BibTeX form. See the package vignette vignette("getting-started", package = "ltgsmd") for worked examples corresponding to Sections 6.1, 6.2, and 6.3 of the paper.

Author(s)

Maintainer: Daiki Nakamura [e-mail] (ORCID)

Authors:

• Daiki Nakamura [e-mail] (ORCID)

See Also

Useful links:

• \Sexpr[results=rd]{tools:::Rd_expr_doi("10.17605/OSF.IO/KW9R6")}

ltgsmd documentation built on Sept. 27, 2026, 5:07 p.m.