Technical report: Calculation of the critical difference (February 2016)
Exploring change in the Australian version of the Early Development Instrument: The estimation of a critical difference for the developmentally "vulnerable”, “at risk” and “on track” categories. The process of calculating critical difference values involves four key stages of analysis. These stages are described briefly in this document. The results of applying the methodology to the Australian version of the Early Development Instrument data are then presented.