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Allocation ratio-The ratio of intended numbers of participants in each of the comparison groups. For two group trials, the allocation ratio is usually 1:1, but unequal allocation (such as 1:2) is sometimes used.
The nifty thing about the expense ratio is that it wraps all these various costs and expenses into one number so that you don't have to do a lot of math. Currently the typical expense ratio for an actively managed mutual fund is about 1.5%, and that number has been going up lately. With an expense ratio of 1.5%, a mutual fund is cutting itself in on 1.5% of the total money in the fund every year. That's whether there's a good year or a bad year for the fund.