Overview | Data | Descriptive plots | 1. Unidimensionality | Conditional infit MSQ | Item-restscore | CFA-based cutoffs for CFI / RMSEA and item loadings | Residual PCA | Martin-Löf test | 2. Local independence | Partial gamma LD | 3. Ordered response category thresholds | 4. Invariance / no DIF | Andersen LR-test | Partial-gamma DIF | Rasch tree (model-based recursive partitioning) | Next step | Targeting | Reliability | Summary coefficients | Conditional reliability | Item and person parameters | Ordinal-to-interval transformation | Person fit | Where to next | References

Setup | Direct equating | Analyze orbits | Equating | Bootstrap | Indirect equating

Overview | Data Preparation | Visualizing response data | Fitting the PCM | Item Fit: Conditional Infit Statistics | Item–Rest Score Association | Conditional ICC Plot | Dimensionality: Residual PCA | Local Dependence: Q3 Residual Correlations | Item Category Probabilities | Person–Item Targeting | Reliability: Relative Measurement Uncertainty | Item Parameters | Person Parameters | References