Reliability and factorial validity of the standard progressive matrices among Kuwaiti children ages 8 to 15 years.

The Raven Standard Progressive Matrices was administered to a sample of 6,529 children in Kuwait ranging in age from 8 to 15 years. Test-retest reliability (N = 968) ranged between .69 and .85, while Cronbach coefficients alpha ranged from .88 to .93, showing from acceptable to good temporal stability and from good to high internal consistency. The loadings of the five sets of matrices on the only salient factor ranged from .73 to .89 indicating the good factorial validity of the scale. The rtest seems useful in the Kuwaiti context.