| Convert Raw Scores
to Cumulative Percentages
Step 4: Compute the Cumulative Percentage.
Now
it is time to compute the cumulative percentage for each raw
score
(i.e., each X value). Each cumulative percentage gives the
percent of individuals at or below its corresponding X value.
First, find the sum of f, which is the total number of scores
in the population (N). Then find the cumulative percentage
by dividing the cumulative frequency (cf) by N. Finally, multiply
by 1, or 100%. Here are the formulas.
- C% = cf/N (100%)
- C% = cumulative percentage
- cf = cumulative frequency
- N = total number of scores in
the population; N=∑f
Copyright 2005 by the Academic Center and the
University of Houston-Victoria.
Created 2004 by Maranda Koenig. Content Reviewed by Hari
Damodaran. Edited by Sandra Heinold. |
