Duke has produced a report on their Bioelectricity MOOC Fall 2012
From the report, I get these ratios:
Input Hours:Content Hours = 620:11.2 = 55.4
(# Completed*Content Hours):Input Hours = 313*11.2:620 = 5.7
How do these ratios compare to other examples? to face-to-face teaching of 313 students?
It would appear the MOOC approach was inefficient in this case given the "high" input:content ratio relative to the "low" completed:input ratio.
The approach potentially gains efficiency if 1) authoring time is reduced or crowd-sourced and/or 2) a course remains on-line, accumulating student completions beyond the course "end date".
Another way to look at this is in salaries versus fees.
Pick a rate, say $27.59/hour.
Input Hours*Rate = 620*$27.59 = $17,105.
Divide by # Completed and you get $17,105/313 = $54.65.
The cost per credit hour at Duke is $1,271.
Do you see the potential for a 95.7% cost reduction here?