Questionnaires inquiring about psychopathology symptoms often produce data with excess zeros or the equivalent (e.g., none, never, and not at all). This type of zero inflation is especially common in nonclinical samples in which many people do not exhibit psychopathology, and if unaccounted for, can result in biased parameter estimates when…

We investigated discrepancies between parent- and self-reported social functioning among youth with autism spectrum disorders (ASD). Three distinct samples showed discrepancies indicating that parents viewed their children as performing one standard deviation below a standardization mean, while youth viewed themselves as comparably-skilled…

The goal of the present study is to demonstrate the ways in which multilevel models can be applied to family research. We emphasize the conceptual issues in family research that this data analytic technique helps us to address. The family represents a nested, hierarchical structure in which multiple children from the same family are not…

The longitudinal relationships between depression, anxiety, conduct problems, and inattention were investigated. The present study attempted to overcome the methodological limitations of prior research on childhood co-occurring syndromes by using continuous measures of constructs, controlling for multiple symptoms at baseline, and considering the…

The longitudinal relationships between depression, anxiety, conduct problems, and inattention were investigated. The present study attempted to overcome the methodological limitations of prior research on childhood co-occurring syndromes by using continuous measures of constructs, controlling for multiple symptoms at baseline, and considering the…

A sample of child guidance clinic patients who received an adult diagnosis of schizophrenia were followed through record sources into middle adulthood. The determination of within-sample differences in long-term adult outcome provided predictive criteria. (Editor)