"Essentials of Stanford-Binet Intelligence Scales (SB5) assessment", by Gale H. Roid and R. Andrew Barram, says on page 59, "The two routing subtests in Item Book 1-- Object Series/Matrices and Vocabulary-- can be combined to form an estimated IQ, called the Abbreviated Battery IQ (ABIQ)." It goes on to say that the basis of the estimate is the combination of fluid reasoning (matrices) with crystallized knowledge (vocabulary).
In "
Use of the SB5 in the Assessment of High Abilities", Deborah Ruf cautions against the use of the ABIQ in assessing high-ability children ("Although the ABIQ does provide a good screening indicator of general ability and correlates highly with FSIQ, it nevertheless incorporates only two subtests. A low (or high) score on one of the subtests may give a very different impression of overall ability than would be the case if more diverse subtests were included in the assessment").
