Reliability and validity of Heim's AH4 in Greece

This study investigated the reliabilities (internal consistency and split-half) and the validity of Helm's AH4 group test scores in a stratified random sample (N = 2926, 1548 girls and 1377 boys) for the age range 13-18 years. Cronbach's alphas ranged from 0.87 to 0.90 for Part I, 0.93 to 0.94 for Part II, and 0.94 to 0.95 for Total AH4; split-halves from 0.79 to 0.86 for Part I, 0.93 to 0.96 for Part II, and 0.95 for Total AH4. The correlation with Raven's Standard Progressive Matrices-in a group of 227 pupils of all ages-was 0.56 for Part I, 0.61 for Part II, and 0.60 for Total AH4. The correlation of AH4 with school marks-in a group of 186 pupils of all ages except age 18-ranged from 0.73 to 0.78. The intercorrelations between both parts ranged from 0.63 to 0.70 in all age groups. (C) 1997 Elsevier Science Ltd.