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Submitted by Dave on

A colleague asked how the results on cost-effectiveness change when we look at learning gain per dollar (as opposed to cost per learning gain, as I've done above). I re-did the estimates that way and found almost precisely the same results. The five cheapest interventions are still indistinguishable within 95% confidence bounds. Because you don't have the effect of near-zero denominators blowing up confidence intervals, the Kenya teacher incentives and the India computer-assisted instruction are distinguishable, but we still haven't factored in errors in cost measurement across interventions, which are likely to be sizeable and should also be factored in.