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Balancing for small control group #40

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shaddyab opened this issue Jan 13, 2020 · 0 comments
Open

Balancing for small control group #40

shaddyab opened this issue Jan 13, 2020 · 0 comments

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@shaddyab
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If I have a control group which is ~2% of the overall data compared to ~98% treatment group (i.e., p=0.98), should the training data be balance such that it will have a 50/50 split between control and treatment?
Otherwise, the negative Inverse probability weight Multiplier for the control group (-1/(1-p) = -50) will be much larger than the positive Inverse probability weight Multiplier for the treatment group (1/p = 1.02).

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