Comparing measures year on year is normally a trivial task. Drop your years into the columns of a matrix and months into the rows and there you go. This all works so long as the dates in the years you’re comparing don’t “overlap”. How can they overlap? An example is the best way to illustrate this issue. Say we’re comparing student withdrawals between academic years which run SEP to AUG. But withdrawals from an academic year may be recorded with a date after the end the actual end of the academic year. Continue reading “Handling Overlapping Academic Years”