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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.
Expense ratio. An expense ratio is the percentage of a mutual fund's or variable annuity's total assets deducted to cover operating and management expenses.xpense ratio. An expense ratio is the percentage of a mutual fund's or variable annuity's total assets deducted to cover operating and management expenses.