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semTests 2.0.0

Breaking changes

• pvalues_nested() has a new default restriction matrix, A.method = "weighted", which does not depend on the units of the observed variables or on the factor identification. lavaan’s construction remains available as A.method = "delta", which reproduces lavTestLRT(method = "satorra.2000") but changes with the units.
• semTests requires lavaan (>= 0.7-3). Its asymptotic covariance for mixed continuous and ordinal data is now robust for the continuous variables.

New features

• semtest() computes score and criterion-difference tests of overall fit and of restrictions in nested models. The restriction tests remain valid when the larger model is misspecified. Overall fit covers complete-data ML and FIML; restriction tests also cover continuous least squares and complete, all-ordered DWLS, WLS, and ULS fits.
• pvalues() accepts semtest() results, so the usual calibrations (ALL, SB, SS, PEBA<j>, …) apply to them.
• inference_control() collects the test conventions (curvature, score covariance, fitting-weight effect) and numerical settings.
• New vignette: vignette("score-criterion", package = "semTests").

Deprecated

• fiml.convention is deprecated. Its "lavaan" option depended on the fit’s information and h1.information options; use lavaan::lavTest() or lavaan::lavTestLRT() to reproduce lavaan’s tests.

Bug fixes

• pvalues_nested(A.method = "exact") was ignored for complete-data fits.
• Nested comparisons with nonlinear equality constraints evaluated the constraint Jacobian at the starting values instead of the estimates. This affected categorical data.
• Nested FIML tests lost accuracy when the variables had very different scales.

Other changes

• Requests for several tests share their statistics and eigenvalues, and complete-data ML no longer builds the full Gamma matrix.
• The vignettes are reorganized into four: an introduction, ordinal indicators, missing data, and score and criterion tests.

semTests 1.0.0

Earlier versions marked several estimators as experimental. This release promotes them to stable.

New features

• GLS, ULS, categorical DWLS and ULS, mixed continuous and ordinal indicators, and FIML, each with one or several groups, now work for both single models and nested comparisons.
• A fiml.convention argument selects the FIML information convention. The default disagrees with lavaan but has better statistical properties; set fiml.convention = "lavaan" to reproduce lavaan’s numbers exactly.
• New vignettes cover measurement invariance with ordinal indicators and latent growth models under FIML.

Bug fixes

• The reweighted least-squares statistic was read as NULL under lavaan 0.7-2 and is now correct. semTests requires lavaan (>= 0.7-2).

Removed

• Nested method 2001 is withdrawn because of its poor performance.
• Full WLS is refused because its correction reduces to the ordinary chi-square.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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