Measurement Precision Sample Clauses
Measurement Precision. Measurement Precision is the extent to which a repeated measurement gives the same result. Variations may arise from inherent capabilities of the instrument, from variations of the operators use of the equipment, or from changes in operating conditions. All instruments, gages, test equipment, and inspectors/operators shall be evaluated for Repeatability and Reproductibility.
Measurement Precision. For 21 pairs of longer subtests and shortened sub- tests coming from 15 tests, we computed the relative 95% CI for both subtests. For all others tests, we lacked complete information about the scale range, coefficient alpha, and the standard deviation of the test scores. Table 5 shows descriptive statistics for the relative 95% CIs (mean K was .49). Measurement precision de- creased little, and on average the CIs covered about one-third of the test-score 240 Deviation Minimum Maximum rXXr < .80 rXXr < .70 Strategy Frequencya K¯ L S L S L S L S L S L S S 44 .52 .84 .80 .06 .08 .69 .57 .95 .92 12 18 1 4 J 3 .68 .86 .75 .05 .10 .80 .63 .89 .82 0 2 0 1 A 1 .60 .90 .89 .90 .89 .90 .89 0 0 0 0 S&J 37 .52 .80 .75 .10 .12 .67 .50 .97 .92 20 21 5 11 S&A 13 .43 .86 .74 .04 .06 .80 .68 .93 .88 0 10 0 2 J&A 0 S&J&A 13 .47 .89 .85 .03 .02 .85 .80 .94 .88 0 0 0 0 Unknown 26 .36 .89 .73 .05 .20 .77 .09 .97 .93 1 13 0 6 Total 137 .49 .84 .77 .07 .12 .67 .09 .97 .93 33 64 6 24 Notes. K¯ = mean K;L = longer test; S = shorter test. Strategies: S = statistics-driven strategy; J = judgmental strategy; A = ad-hoc strategy. a Frequency = pairs of subtests. (for 17 Pairs of Subtests) Relative 95% CI Statistic Long Short Mean .26 .32 Standard deviation .07 .11 Minimum .15 .16 Maximum .41 .54