Table 2.
Descriptive statistics for the WJ IV.
| Low | Average | High | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N | M (SD) | Skew | Kurt | N | M (SD) | Skew | Kurt | N | M (SD) | Skew | Kurt | |
| WJ IV Elementary | ||||||||||||
| Gc | 400 | 86.27 (13.22) | 0.07 | −0.26 | 801 | 100.14 (12.09) | −0.12 | 0.69 | 412 | 111.83 (12.38) | 0.11 | −0.03 |
| Gf | 401 | 83.95 (11.56) | −0.40 | 0.70 | 801 | 100.39 (9.93) | 0.07 | −0.02 | 412 | 115.16 (11.57) | 0.25 | 0.10 |
| Gwm | 400 | 86.03 (12.50) | −0.38 | 0.79 | 801 | 100.62 (11.03) | −0.09 | 0.20 | 412 | 114.27 (11.69) | 0.00 | 0.78 |
| Gs | 399 | 89.15 (14.33) | 0.16 | 0.69 | 799 | 100.53 (13.05) | −0.01 | 0.42 | 412 | 110.04 (13.34) | 0.26 | 0.36 |
| Ga | 401 | 84.43 (12.26) | −0.07 | 0.88 | 801 | 99.85 (11.94) | 0.13 | 0.17 | 412 | 114.03 (11.29) | 0.07 | 0.19 |
| Glr | 401 | 86.13 (12.67) | −0.13 | 0.04 | 801 | 100.69 (12.43) | −0.21 | 0.20 | 412 | 112.55 (12.36) | 0.13 | 0.20 |
| Gv | 401 | 87.91 (14.01) | −0.30 | 0.39 | 801 | 101.13 (12.87) | 0.11 | 0.69 | 412 | 111.95 (13.97) | 0.23 | 0.20 |
| BRS | 401 | 85.93 (13.24) | −0.41 | 0.20 | 801 | 100.74 (11.70) | 0.05 | 0.36 | 412 | 112.51 (11.99) | 0.23 | 0.29 |
| RC | 396 | 85.96 (14.43) | −0.79 | 1.39 | 800 | 101.26 (11.79) | −0.07 | 0.54 | 412 | 113.71 (12.55) | 0.33 | 0.22 |
| GIA | 401 | 80.14 (9.57) | −1.06 | 1.49 | 801 | 100.39 (6.45) | 0.13 | −0.34 | 412 | 118.37 (7.62) | 1.23 | 2.48 |
| WJ IV Secondary | ||||||||||||
| Gc | 466 | 86.43 (12.77) | −0.01 | 0.48 | 997 | 99.72 (11.66) | 0.11 | 0.19 | 492 | 115.14 (12.71) | 0.42 | 0.18 |
| Gf | 466 | 82.82 (11.68) | −0.33 | 0.21 | 997 | 99.81 (11.32) | 0.00 | 0.28 | 492 | 114.04 (10.91) | 0.08 | −0.16 |
| Gwm | 466 | 85.97 (11.31) | −0.09 | 0.24 | 997 | 100.54 (11.99) | 0.04 | 0.00 | 492 | 115.16 (11.73) | 0.22 | −0.06 |
| Gs | 466 | 87.59 (14.95) | −0.40 | 0.66 | 997 | 99.60 (12.81) | −0.10 | 0.13 | 492 | 110.45 (12.69) | −0.10 | −0.22 |
| Ga | 466 | 84.55 (11.85) | −0.09 | 0.18 | 997 | 100.47 (11.46) | 0.18 | −0.26 | 492 | 114.14 (12.62) | 0.20 | −0.01 |
| Glr | 466 | 87.11 (13.97) | −0.12 | 0.16 | 997 | 100.35 (12.34) | 0.17 | 0.06 | 492 | 112.35 (13.18) | 0.15 | −0.13 |
| Gv | 466 | 88.71 (14.34) | −0.05 | 0.51 | 997 | 101.07 (13.03) | 0.17 | 0.34 | 492 | 111.13 (14.02) | 0.31 | 0.07 |
| BRS | 466 | 86.04 (13.62) | −0.47 | 1.01 | 997 | 100.22 (12.29) | 0.24 | 0.82 | 492 | 113.71 (13.69) | 0.26 | 0.29 |
| RC | 466 | 83.87 (14.84) | −0.58 | 0.81 | 997 | 100.09 (12.49) | 0.04 | 0.32 | 492 | 112.32 (13.48) | −0.05 | 0.35 |
| GIA | 466 | 79.28 (9.57) | −1.24 | 2.22 | 997 | 99.52 (6.90) | 0.02 | −0.54 | 492 | 118.21 (7.66) | 0.67 | 0.27 |
Note. Gc = Comprehension–Knowledge, Gf = Fluid Reasoning, Gwm = Short-Term Working Memory, Gs = Processing Speed, Ga = Auditory Processing, Glr = Long-Term Retrieval, Gv = Visual Processing, BRS = Basic Reading Skills, RC = Reading Comprehension, GIA = General Intellectual Ability.