cumulative percentage
a running total of the percentage values occurring across a set of responses. The total will either remain the same or increase, reaching the highest value of 100% after totaling all of the previous percentages. For example, if the percentage of freshmen, sophomores, juniors, and seniors among all of the students at a college were 40%, 25%, 20%, and 15%, respectively, the cumulative percentage values would be 40%, 65%, 85%, and 100% when summing from the percentage of freshman up to the percentage of seniors.