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KABC-II Subtests as Measures of g

Adapted from Table 8.14 in the KABC-II Manual

Good measure of g

Fair measure of g

Poor measure of g

Subtest

Average loading of g

Proportion of variance attributed to g (%)

Subtest

Average loading of g

Proportion of variance attributed to g (%)

Subtest

Average loading of g

Proportion of variance attributed to g (%)

Riddles

.76

58

Pattern Reasoning

.68

46

Number Recall

.49

24

 

Verbal Knowledge

.76

58

Word Order

.65

42

Hand Movements

.48

24

 

Expressive Vocabulary

.73

53

Story Completion

.64

40

Gestalt Closure

.49

24

 

 

 

 

Triangles

.60

36

Face Recognition

.32

10

 

 

 

 

Conceptual Thinking

.59

34

 

 

 

 

 

 

 

Atlantis

.57

32

 

 

 

 

 

 

 

Rebus

.54

29

 

 

 

 

 

 

 

Rover

.52

27

 

 

 

 

 

 

 

Block Counting

.50

25

 

 

 

 

 Subtests as Measure of g

The loadings on the first unrotated factor provide information about g, or general intelligence. The KABC-II subtests form three g-related clusters :
 
               Riddles, Verbal Knowledge, and Expressive Vocabulary are good measures of g.
               Pattern Reasoning, Word Order, Story Completion, Triangles, Conceptual Thinking, Atlantis, Rebus, Rover, and Block Counting are fair measures of g.
               Number Recall, Hand Movements, Gestalt Closure, and Face Recognition are poor measures of g.
               
The Knowledge/Gc subtests have the highest g loadings in the test. On average, the proportion of variance attributed to g is 56% for the Knowledge/Gc  subtests, 43% for the Planning/Gf subtests, 31% for the Learning/Glr subtests, 30% for the Sequential/Gsm subtests, and 26% for the Simultaneous/Gv subtests. Subtests with the highest proportion of variance attributed to g are Riddles, Verbal Knowledge, and Expressive Vocabulary, all subtests of the Knowledge/Gc Scale Index. None of the Planning/Gf, Learning/Glr subtests, Sequential/Gsm subtests, or Simultaneous/Gv subtests are good measures of g.