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A comment on Why Education Startups Do Not Succeed (2011). Parent comment

Re:Why Education Startups Do Not Succeed (2011) by ivan_ah on Thursday November 16, 2017 @12:07AM (#15710379)
This seems relevant: https://en.wikipedia.org/wiki/Bloom%27s_2_Sigma_Problem

I haven't read the paper myself and don't vouch for it, but I've heard two-sigma mentioned a lot.

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Re:Why Education Startups Do Not Succeed (2011) by rahimnathwani on Thursday November 16, 2017 @05:58AM (#15711727)
The paper's here: http://web.mit.edu/5.95/readings/bloom-two-sigma.pdf

It's not relevant to my specific question, as the three groups in the test had student:teacher ratios of (1) 30:1, (2) 30:1, (3) between 1:1 and 3:1

I'm interested in variation between the students within group 3, not the difference between the three groups.

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