Outliers are typically regarded as data anomalies that should be discarded. However, dynamic or "innovative" outliers can be appropriately utilized to capture unusual but substantively meaningful shifts in a system's dynamics. We extend De Jong and Penzer's 1998 approach for representing outliers in single-subject state-space models to a…

Results in this study suggest that it is possible to use performance on a moderator or predictability scale to select a subgroup for whom correspondence between two predictors and the criterion is much greater than that of a subgroup whose scores on the moderator indicate a lesser degree of correspondence. (Author/ES)

This study stems from attempts to develop prediction equations for freshman grade point average for two demographic classifications of students at a southwestern university. Although the particular results are probably of interest only to that university, certain aspects of the study should be of general interest, because, of the 3,237 students…

If any one fact has emerged consistently in the International Project for the Evaluation of Educational Achievement (IEA) studies of educational achievements, it is that achievement is related to a variety of factors in the home background of children. This is true so far as differences in the achievements of single students within a country are…

Validation of an Air Force vocational interest inventory in the enlisted force was conducted to develop improved job placement techniques with a view toward practical application of results during initial counseling and job placement of enlisted personnel. The Vocational Interest-Career Examination (VOICE) was administered to 18,000 recruits…