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# 3900Chp5 - Chapter 5 Reliability Concepts Definition of...

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Chapter 5: Reliability Concepts Definition of Reliability Test consistency Classical Test Theory X = T + E Obtained True Random Score Score Error Estimation of Reliability Correlation coefficients (r) are used to estimate reliability The proportion of variance attributable to individual differences Directly interpretable Reliability of .90 accounts for what % of the variance? Conceptual True Score Variance Fine for true score variance T = X - E Convert formula to variances ( σ 2 ) Partial out the ratio of obtained score variance and error variance Substitute the ratio of obtained score variance for 1 Reliability is the ratio of error variance to obtained score variance subtracted from 1 Types of Reliability Test-retest Alternate Forms Split-Half Inter-item consistency Interscorer Test-Retest Reliability Coefficient of stability is the correlation of the two sets of test scores Alternate (Equivalent) Forms Reliability Coefficient of equivalence is the correlation of the two sets of test scores Split-half Reliability Coefficient of internal consistency is the correlation of the two equal halves of the test. Reliability tends to decrease when test length decreases

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3900Chp5 - Chapter 5 Reliability Concepts Definition of...

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