The data collected came from many countries in the Australasian region, and as far away as Germany and the USA. The detection of changes or trends in prevailing infection rates in collection regions is of critical importance. This may sound straight forward however the nature of the data where there exists large numbers of cases and very few positive infection rates makes for some interesting modelling and analysis. Data Analysis Australia was asked to review current practices and provide a methodology for analysing the data.
Datasets for each country to be analysed, consisted of a large number of independent cases, each of which could record one of two outcomes - in this case a positive or negative result. The number of positives was very low relative to the number of cases. The data analysis had to be statistically sound, demonstrate best practice and follow a well-documented, repeatable process, allowing external review by regulatory bodies.