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Title: Research Methods Notes - PsyD program
Description: notes from research methods class. Doctoral Program. reliability, validity, true measurements, individual scores, group data, Watson’s stability, sampling error, reliability coefficients, sampling error, etc.
Description: notes from research methods class. Doctoral Program. reliability, validity, true measurements, individual scores, group data, Watson’s stability, sampling error, reliability coefficients, sampling error, etc.
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• Reliability: quality of test scores that suggests they are sufficiently consistent and free from
measurement error to be useful
• measurement error: any fluctuation in scores that results from factors related to
measurement process that are irrelevant to what is being measured
• individual scores
• true scores: hypothetical perfect score
• observed scores: score obtained on a particular test, includes error
• observed score = true score + error
• error: difference between true and observed scores, “noise”
• True scores in group data: deals with variance (error around mean of group)
• true variance: differences among scores of individuals within a group that reflect their
position in whatever characteristic the test assesses
• error variance: differences among test scores that reflect factors irrelevant to what
the test assesses
• evaluating score reliability: requires determining what possible sources of error may enter
into test scores, requires estimating the magnitude of those errors
• reliability coefficient: ratio of true score variance to total test score variance; if all test score
variance were true score variance, score reliability would be 1
Title: Research Methods Notes - PsyD program
Description: notes from research methods class. Doctoral Program. reliability, validity, true measurements, individual scores, group data, Watson’s stability, sampling error, reliability coefficients, sampling error, etc.
Description: notes from research methods class. Doctoral Program. reliability, validity, true measurements, individual scores, group data, Watson’s stability, sampling error, reliability coefficients, sampling error, etc.