tlstyer/dominionstats — comment on commit 281b1ccc7bc191f8eaf3196b19bad0fe69289a03
File: optimal_card_ratios.py line 62
By rrenaud:

I think by swapping (rather than using an if like in the __init__ simplication) you are double counting this card ratio event. I guess it doesn't matter as is, since you eventually divide the total win points by the total frequency (and both get double counted and cancelled), but it will throw off the variance estimate if you move to using the MeanVarStat.