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fluwsupgelater.tk D Parallel Form Reliability: It is an estimate of consistency between two different instruments of measurement. The inter-correlation between two parallel forms of a test or scale is used as an estimate of parallel form reliability. Validity of a scale or test is ability of the instrument to measure what it purports to measure Nunnally, J. Construct validity, Content Validity, Criterion Validity are types of validity. Construct validity is estimated by convergent and discriminant validity and factor analysis.
Convergent and discriminant validity are ascertained by correlation between similar of different constructs. Content Validity: Subject matter experts evaluate content validity.
Requiring no prior training, Modern Statistics for the Social and Behavioral Sciences provides a two-semester, graduate-level introduction to basic statistical . rohynadispu.cf: Modern Statistics for the Social and Behavioral Sciences: A Practical Introduction (): Rand Wilcox: Books.
Criterion Validity is correlation between the test and a criterion variable or variables of the construct. Regression analysis , Multiple regression analysis , Logistic regression is used as an estimate of criterion validity. The modern test theory is based on latent trait model. Every item estimates the ability of the test taker. The difficulty parameter is called b.