cumulative relative frequency
a running sum of the proportion of times specific scores occur compared to the total number of individual score occurrences in a set of data. For example, a teacher may find that there was just one score of F out of a total of 12 scores, such that the first cumulative relative frequency distribution value was .083 (i.e., 1/12). If there were two scores of D added to the one score of F, the second value would be .250 (i.e., 1/12 + 2/12 = 3/12); and so on up through the values to a score of A, which would equal 1.0 as all of the scores would be taken into account at that point (i.e., 12/12 = 1.0). A collection or table of cumulative relative frequencies is called a cumulative relative frequency distribution,and a plot of the values is called a cumulative relative frequency curve, cumulative relative frequency diagram, or cumulative relative frequency graph. Also called cumulative proportion.