About Validity and Reliability - Atrium

Construct Validity:Test-Retest Reliability:A complex validity measure, first identifiedby Lee J. Cronbach and Paul E. Meehl in1995, construct validity evaluates whetheryour proposed measure correlates with allconcepts related to the theory underinvestigation.The most common form of reliabilitymeasure, test-retest reliability refers tocorrelating multiple applications of a singlemeasure, conducted at different times.Multiple Forms Reliability: Similar to test-retest reliability, multipleforms reliability refers to the application ofequivalent forms of a measure (e.g. the samemeasure, with differently worded questions),and their correlation.Split-half Reliability:refers to a single administration of ameasure, correlated with itself.Spearman-Brown Formula: adjusts the correlation coefficient,preventing a decrease in the observedreliability of a measure when that measure issplit into multiple parts.Cronbach's alpha:Internal Validity:External Validity:another internal consistency approach, usedto overcome disadvantages seen with thesplit-half reliability approach, which is, inessence, the average of all possible split-halfcorrelations within a measure.If the observed effect is determined to bedue to the stimulus, then the measure is saidto be internally valid.This form of validity is concerned with thegeneralizability of observed results.10