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Chapter 5 Reliability Notes

by: Chris Pulcher-Coard

Chapter 5 Reliability Notes PSY 3400

Marketplace > North Carolina Central University > Psychlogy > PSY 3400 > Chapter 5 Reliability Notes
Chris Pulcher-Coard
GPA 3.904

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About this Document

Psychological Measurement with George Cliette: This complete set of notes covers Chapter 5 of the book dealing with test reliability. Includes highlighting in the document and looks at the construc...
Psychological Measurement
Dr. George Cliette
Class Notes
Reliability, test, Cliette, Psychology, psych, Psychological, measurement, Chapter, five, 5, NCCU, North, carolina, central, University
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This 2 page Class Notes was uploaded by Chris Pulcher-Coard on Sunday April 3, 2016. The Class Notes belongs to PSY 3400 at North Carolina Central University taught by Dr. George Cliette in Winter 2016. Since its upload, it has received 9 views. For similar materials see Psychological Measurement in Psychlogy at North Carolina Central University.


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Date Created: 04/03/16
Psych Measurements Reliability Chapter 5 ~Reliability – the consistency and uniformity of the measuring tool ~Errors – component of a score that doesn’t have to do w/the test taker’s abilities ~Variance is an important measure of reliability - σ² = total variance - σ²tr = true variance - σ²e = error variance - σ² = σ²tr - σ²e ~Error Variance may be a result of: - test construction - test admin - test scoring/interpretation ~Reliability Estimates: - Split Half – involves 1) dividing the test into two equivalent portions, 2) computing the Pearson r b/w the two halves, and 3) adjusting the half-test reliability using the Spearman Brown Formula  Correlates pair of scores from each half of the test - Parallel Form – various forms of the same test are created and used to test; means and variances for the tests are equal  Measured by the coefficient of equivalence - Test-Retest – correlates pairs of scores from the same ppl on two diff administrations of the test  When the retest is conducted after six months, it is measured by the coefficient of stability  Similar to the parallel form b/c it requires two administrations to the same group of ppl ~Inter-Item Consistency – degree of correlation b/w all items on one test (calculated from a single administration of a single form of the test) - Kuder-Richardson Formula – statistic of choice for determining inter- item consistency of dichotomous items (homogeneous tests); KR coefficient become extremely low on heterogeneous tests - Coefficient Alpha – determines inter-item consistency on ~Homogeneity – extent to which items on a test measure a single tr8 (how unifactoral test items are) ~Heterogeneity – extent to which items on a test measure a different or multiple factors ~Inter-Scorer Reliability – degree of consistency b/w 2or more testtakers - Measured by the coefficient of inter-scorer reliability ~True Score Theorists – estimate the portion of a test score which can be attributed to error to find the true variance ~Domain Sampling Theorists – estimate the extent to which specific sources of variation under controlled conditions are contributing to the test score - Objective measure of how precisely the test score assesses the domain from which it draws a sample ~Generalizability Theory – A person’s test scores will vary from testing to testing - Facets are what cause this change - Facet – number of items in the test; amount of training the test scores have had; purpose of the test’s administration ~Reliability Coefficient – helps the test developer build an adequate measuring instrument (assessment/test), so that the test user (or administrator) may select a suitable test


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