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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 an annual fee charged to all shareholders of a particular mutual fund. It's expressed as a percentage of assets. For example, if a fund has an expense ratio of 1.1 percent, then $11 of every $1,000 is taken out every year by the fund company to pay for various operating expenses.