File this under "you read it first on e-Literate".
In previous posts from spring 2013 I provided a graphical view on MOOC student patterns based on observed retention over time as well as differing student types. This graphic was based on anecdotal observations of multiple MOOCs, mostly through Coursera.
Based on a recent study of the edX Circuits and Electronics MOOC, there is this interesting chart of student patterns based on actual data analysis of the 155k students from the spring 2012 offering of this course. The full report is worth reading, by the way, with some real student pattern insights.
I took this chart and overlaid it on the MOOC student patterns graphic, scaling for 0% / 100% of enrollment vertically and start / stop of course horizontally.
It's good to see this validation of the overall retention pattern based on real data analysis to augment the original graphic's model.