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One of the conscious aims of the undergraduate coursera classes has been to lower the bar (in terms of assumed prerequisites, pace, and scope) in order to increase participation.

Daphne Koller's Probabilistic Graphical Models was their first graduate class and it was definitely tougher than other Coursera offerings have been.

This. The Coursera PGM class is the only free online class that I've enrolled in that felt like a similar difficult to a slightly harder than average undergrad course at Caltech (where I go to school).

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