Linganisha mbinu

	Uchambuzi Imara wa Kipengele	Uundaji wa Kipimo
Nyanja	Saikometriki	Saikometriki
Familia	Latent structure	Latent structure
Mwaka wa asili	1980s–2000s	1991–1995
Mwanzilishi	Robust methods tradition (Huber, Hampel, Tukey); applied to item analysis by Wilcox and colleagues	Multiple contributors; codified by Robert DeVellis and Lee Anna Clark & David Watson
Aina	Diagnostic / item-level evaluation	Multi-step methodological framework
Chanzo asilia	Wilcox, R. R. (2012). Introduction to Robust Estimation and Hypothesis Testing (3rd ed.). Academic Press. ISBN: 978-0123869838	DeVellis, R. F. (2016). Scale Development: Theory and Applications (4th ed.). SAGE Publications. ISBN: 978-1506341569
Majina mbadala	robust item statistics, outlier-resistant item analysis, robust classical item analysis	questionnaire construction, instrument development, measurement scale construction, psychometric scale building
Zinazohusiana	5	5
Muhtasari	Robust item analysis applies outlier-resistant statistical methods to the evaluation of individual test or scale items. Instead of classical means and Pearson correlations — both sensitive to extreme scores — it uses trimmed means, Winsorized correlations, or M-estimators to obtain item difficulty and item-total discrimination indices that remain stable when respondent distributions are skewed or contaminated by outliers.	Scale development is a structured, multi-step process for creating psychometrically sound measurement instruments that capture latent psychological constructs. It encompasses construct definition, item generation, expert review, exploratory and confirmatory factor analysis, reliability estimation, and validity evidence collection — producing a final set of items suitable for quantitative research.