When to Inspect!

K. Tang and J. Tang (1994, Design of screening procedures: a review. Journal of Quality Technology 26(3) p. 209-226.) list some useful rules about when to inspect during manufacturing.

1. Inspect after procedures likely to produce nonconforming items.
Rasch: After applying a scoring key, check for misfit and negative point-biserial correlations.

2. Inspect before costly procedures.
Rasch: Inspect before analyzing an enormous sample. Inspect output on screen before printing on paper.

3. Inspect before procedures where nonconforming items may jam machines.
Rasch: Misinterpretation of incorrect results "jams" the mind, vitiating analysis of correct results.

4. Inspect before procedures that cover up nonconforming items.
Rasch: Scan maps and numerical details before counting on summary statistics.

5. Inspect before assembly procedures where rework is costly.
Rasch: Inspect before using Rasch measures for statistical analysis or substantive decisions. Errant pass-fail decisions are hard to reverse.

When to inspect. Tang K, Tang J. … Rasch Measurement Transactions, 1996, 10:1 p.483

Rasch Publications
Rasch Measurement Transactions (free, online) Rasch Measurement research papers (free, online) Probabilistic Models for Some Intelligence and Attainment Tests, Georg Rasch Applying the Rasch Model 3rd. Ed., Bond & Fox Best Test Design, Wright & Stone
Rating Scale Analysis, Wright & Masters Introduction to Rasch Measurement, E. Smith & R. Smith Introduction to Many-Facet Rasch Measurement, Thomas Eckes Invariant Measurement: Using Rasch Models in the Social, Behavioral, and Health Sciences, George Engelhard, Jr. Statistical Analyses for Language Testers, Rita Green
Rasch Models: Foundations, Recent Developments, and Applications, Fischer & Molenaar Journal of Applied Measurement Rasch models for measurement, David Andrich Constructing Measures, Mark Wilson Rasch Analysis in the Human Sciences, Boone, Stave, Yale
in Spanish: Análisis de Rasch para todos, Agustín Tristán Mediciones, Posicionamientos y Diagnósticos Competitivos, Juan Ramón Oreja Rodríguez

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