Measures of variability are successfully used in predictive modeling in research areas outside of education. This study examined how standard deviations can be used to address research questions not easily addressed using traditional measures such as group means based on index variables. Student survey data were obtained from the Organisation for…

Adapted screening devices and teacher observation were used in a 1974 study of 1003 Finnish students (ages 6-8) in an effort to predict future learning difficulties. Six areas were assessed: gross motor skills, sensory-motor integration, perceptual-motor skills, arithmetic skills, socioemotional adjustment, and verbal ability. In a follow-up study…