Hi anicholson - I remember reading your question when it was first posted and thinking: "That's a good question! I wonder what the answer is??"
And given the lack of responses you received so far, it appears others may be thinking the same thing! I did, however, stumble across this blog entry from Instructure employee @Katrina-Hess that may be giving you a rather unwelcome answer: New vs. Old Analytics . If you check that table, in the row for Rollup for Student Assignment Status, it says In development: number of missing, late, on time per student. Perhaps Katrina can answer your question more definitively, but it appears that Instructure is aware of this and are working on it. You may want to follow that blog entry, as well, and/or post some comments there.
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