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B Tables Summarizing GATB Reliabilities TABLE B-1 Effect Sizes for GATB Aptitude Scores, from Initial Testing to Retestinga for GATB Cognitive Aptitudes: Studies with Same-Form Retesting Form Number of Study Administered Interval Samples G V N Buckner (1962) 4 years 214 0.91 0.83 0.53 USES Manual (1970) A 2 weeks 276 males 0.43 0.32 0.34 A 2 weeks 246 females 0.48 0.43 0.45 B 2 weeks 168 males 0.46 0.34 0.41 B 2 weeks 155 females 0.40 0.35 0.41 B 2 weeks 212 males 0.43 0.28 0.29 B 2 weeks 231 females 0.42 0.29 0.36 A 3 weeks 605 males 0.48 0.33 0.37 A 3 weeks 554 females 0.50 0.35 0.41 aMean changes expressed in standard deviations of the initial-testing distribution. 325

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326 APPENDIX B TABLE B-2 Effect Sizes for GATB Aptitude Scores, from Initial Testing to Retestinga for GATB Cognitive Aptitudes: Studies with Alternate-Form Retesting Form Administration Number of Study Order Interval Samples G V N USES Manual (1970) A,B I week 95 males 0.26 0.17 0.20 A,B 1 week 85 females 0.19 0.24 0.22 USES Manual Addendum (1986) A,C I week 562 0.24 0.05 0.19 A,D 1 week 562 0.20 0.07 0.10 C,A 1 week 563 0.19 0.14 0.13 C,D 1 week 544 0.19 0.12 0.08 D,A 1 week 556 0.27 0.16 0.24 D,C 1 week 543 0.25 0.07 0.21 Showler and Droege (1969) A,B I day 409 0.24 0.17 0.26 A,B 2 weeks 354 0.15 0.14 0.16 A,B 6 weeks 324 0.02 0.03 0.06 A,B 13 weeks 325 0.15 0.14 0.16 A,B 26 weeks 293 0.09 0.05 0.04 A,B 1 year 302 0.21 0.19 0.21 A,B 2 year 288 0.21. 0.18 0.20 A,B 3 years 306 0.23 0.30 0.18 aMean changes expressed in standard deviations of the initial-testing distribution. TABLE B-3 Effect Sizes for GATB Aptitude Scores, from Initial Testing to Retestinga for GATB Perceptual Aptitudes: Studies with Same-Form Retesting Form Number of Study Administered Interval Samples S P Q Buckner (1962) USES Manual ( 1970) A B B B B B 4 years 214 0.85 0.73 1.00 2 weeks 276 males 0.55 0.46 0.64 2 weeks 246 females 0.63 0.59 0.72 2 weeks 168 males 0.52 0.48 0.62 2 weeks 155 females 0.60 0.60 0.73 2 weeks 212 males 0.67 0.55 0.76 2 weeks 231 females 0.60 0.64 0.83 3 weeks 605 males 0.56 0.51 0.80 3 weeks 554 females 0.67 0.55 0.77 aMean changes expressed in standard deviations of the initial-testing distribution.

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APPENDIX B 327 TABLE B-4 Effect Sizes for GATB Aptitude Scores, from Initial Testing to Retestinga for GATB Perceptual Aptitudes: Studies with Alternate-Form Retesting Form Administration Number of Study Order Interval Samples S P Q A,B A,B USES Manual Addendum (1986) A,C A,D C,A C,D D,A D,C A,B A,B A,B A,B A,B A,B A,B A,B USES Manual (1970) Showler and Droege (1969) 1 week 95 males 0.40 0.33 0.44 1 week 85 females 0.28 0.36 0.49 1 week 562 0.39 0.41 0.35 1 week 562 0.39 0.24 0.38 1 week 563 0.41 0.18 0.48 1 week 544 0.46 0.30 0.41 1 week 556 0.38 0.25 0.44 1 week 543 0.36 0.34 0.35 0.38 0.53 0.55 0.32 0.40 0.54 0.21 0.27 0.43 0.29 0.34 0.46 0.17 0.30 0.36 0.23 0.13 0.38 0.21 0.17 0.29 0.19 0.20 0.23 1 day 409 2 weeks 354 6 weeks 324 13 weeks 325 26 weeks 293 I year 302 2 year 288 3 years 306 aMean changes expressed in standard deviations of the initial-testing distribution. TABLE B-5 Effect Sizes for GATB Aptitude Scores, from Initial Testing to Retestinga for GATB Psychomotor Aptitudes: Studies with Same-Form Retesting Form Number of Study Administered Interval Samples K F M Buckner (1962) 4 years 214 1.08 Rotman (1963) (Mentally 4.6 days 40 0.94 0.43 1.23 retarded subjects with an (avg.) average of 4.55 days' practice) Rotman (1963) (Mentally 4.6 days 40 0.52 0.38 0.04 retarded subjects retested (avg.) without practice) USES Manual (1970) A 2 weeks 276 males 0.43 A 2 weeks 246 females 0.57 B 2 weeks 168 males 0.51 B 2 weeks 155 females 0.63 B 2 weeks 212 males 0.83 B 2 weeks 231 females 0.85 A 3 weeks 605 males 0.60 0.80 0.92 A 3 weeks 554 females 0.56 0.86 0.96 aMean changes expressed in standard deviations of the initial-testing distribution.

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328 APPENDIX B TABLE B-6 Effect Sizes for GATE Aptitude Scores, from initial Testing to Retestinga for GATE Psychomotor Aptitudes: Studies with Alternate-Form Retesting Form Administration Number of Study Order Interval Samples K F M Showier and Droege (1969) A,B 1 day 409 0.44 0.64 0.61 A,B 2 weeks 354 0.42 0.53 0.52 A,B 6 weeks 324 0.42 0.62 0.44 A,B 13 weeks 325 0.31 0.41 0.31 A,B 26 weeks 293 0.26 0.36 0.34 A,B 1 year 302 0.41 0.40 0.28 A,B 2 year 288 0.38 0.44 0.50 A,B 3 years 306 0.23 0.27 0.34 USES Manual Addendum (1986) A,C 1 week 273 -.26 -.13 A,D 1 week 260 -.19 0.64 A,C 1 week 562 0.08 A,D 1 week 562 0.33 C,A 1 week 563 0.22 C,D 1 week 544 0.17 D,A 1 week 556 0.34 D,C 1 week 543 0.09 aMean changes expressed in standard deviations of the initial-testing distribution.