A statistical term describing the total number of trials or observations within a given interval or frequency bin. The frequency bins can be of any size, but they must be mutually exclusive, exhaustive and the data must be grouped.
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The absolute frequency is simply the total number of observations or trials within a given range. For example, assume there is a collection of grouped data for the percentage returns for a particular stock, which is ranged from lowest to highest. If there are 56 observations within the 5-7% frequency bin, then the absolute frequency of this bin is 56.
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