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14 Cards in this Set
- Front
- Back
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What is the name for the way to measure reliability that uses 2 trials test retest?
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interclass Reliability Pearson Product Moment
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What score would indicate good reliability?
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.80 or higher
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What measure would you use if you were to have 3/+ trials?
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Intraclass Reliability ANovA model, "Cronbach's Alpha Coefficient"
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what is the index of reliability
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√rxx' The theoretical correlation between observed scores and true scores
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SEM has to do with ________?
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reliability
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SEP has to do with __________?
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Validity
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What does the SEM represent?
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Reflects the degree to which a person's observed score fluctuates as a result of errors of measurement.
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What does the observed score =?
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tre score + error score
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What is the mathematical definition of reliability?
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the proportion of observed score variance that is true score variance
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What 2 types are reliability coefficients classified into?
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Interclass coefficients (based on the PPM correlation coefficient) and intraclass coefficients (based on analysis of variance, or ANOVA models)
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What are the 3 interclass reliability methods? When would you use them?
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Test-retest: 2 tests and correlate the 2 sets of observations using the PPM correlation coefficient, equivalence: Teacher uses 2 forms on tests and uses the PPM to correlate the variables. Split halves reliability: correlation between 2 halves of the test. Use the Spearman-Brown Prhophecy formula,
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When would you use the Spearman-Brown Prophecy Formula?
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Used to estimate the reliability of a test wehn the test length is changed.
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what is the purpose of the separman Brown Prophecy Formula?
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Tries to establish internal stability of a test.
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In the spearman Brown Prophecy Formula, what does k=?
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the number of items I WANT to estimate the reliability for divided by the number of items I HAVE reliability for.
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