Examined Swedish children's inhibition behavior using mothers' and psychologists' ratings of inhibition at age 18 and 24 months to predict later ratings through age 16 years. Prediction was more reliable for children rated as very inhibited or very uninhibited than for those in nonextreme group through age six. Only for inhibited girls did early…

According to Cronbach's method of data analysis--which decomposes individual scores into separate components for different levels of aggregation--data collected for an investigation of the development of individual differences in ability test scores from grade 4 through grade 9 were grouped into school district, class, and individual components.…