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ERIC Number: ED132206
Record Type: RIE
Publication Date: 1976-Sep
Reference Count: 0
Three Approximations of Standard Error of Measurement: An Empirical Approach.
Garvin, Alfred D.
Three successively simpler formulas for approximating the standard error of measurement were derived by applying successively more simplifying assumptions to the standard formula based on the standard deviation and the Kuder-Richardson formula 20 estimate of reliability. The accuracy of each of these three formulas, with respect to the standard formula, was assessed empirically in a sample of 60 sets of test results, representing a wide variety of test characteristics. It was found that all three formulas provided an essentially unbiased approximation of the value given by the standard formula: the mean error was +.04 of a score point for each formula. The standard deviations of these errors were .09, .10, and .25 of a score point for the three formulas respectively. It was concluded that any of these three formulas was accurate enough for most practical purposes. (Author/RC)
Publication Type: Reports - Research
Education Level: N/A
Authoring Institution: N/A
Note: Paper presented at the Annual Meeting of the American Psychological Association (84th, Washington, D.C., September 1976)