Results: The data revealed interval sorting and kappa to be a suitable method for examining reliability of occurrence and duration of ongoing social communication behavioral dimensions. Further, interval size and total observation length were manipulated to determine their influence on reliability.
Data were analyzed for interobserver and intraobserver agreements using time-interval sorting and Cohen's kappa. Data were collected from 20 different 2-min video segments of children in kindergarten through 3rd-grade classrooms. The technology allowed for coding frequency and duration for each entered code. The dimensions were mutually exclusive and accounted for all verbal and nonverbal productions during a specified time frame. They observed and independently coded 6 social communication behavioral dimensions using handheld computers. Method: Four coders participated in this study. Of particular interest was finding a method for determining whether independent observers could reliably judge both occurrence and duration of ongoing behavioral dimensions for describing social communication performance. Purpose: To explore the utility of time-interval analysis for documenting the reliability of coding social communication performance of children in classroom settings.
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