lavDiag 0.1.0

• Initial CRAN release.
• Provides diagnostics and visualization tools for latent variable models fitted with lavaan or blavaan.

Core functionality

• augment() — augments fitted models with predicted values, residuals, SEs, and CIs (continuous, ordinal, or mixed indicators).
• prepare() — constructs model-based item curves and latent grids for continuous/ordinal indicators.
• lavPredict_parallel() — robust, parallel wrapper for lavaan::lavPredict() with automatic handling of ordinal data.

Item-level diagnostics

• item_data() — extracts model-based and empirical item-level information for plotting or inspection.
• item_plot() — visualizes empirical vs. model-implied item curves, including confidence intervals.

Residual diagnostics

• resid_cor() — computes residual (co)relations and z-statistics.
• resid_corrplot() — visualizes residual correlations using corrplot.
• resid_qq() — draws Q–Q plots of residual correlation z-statistics.

Model summaries and utilities

• parameter_estimates() — enhanced extraction of standardized parameter estimates with robust SEs.
• model_info() — extracts compact model metadata (grouping, variables, parameterization, etc.).
• hopper_plot() — summarizes fit indices and modification indices across multiple models.