A cumulative histogram counts the number of observations in all bins. Unlike a traditional histogram in which bin values are totaled separately, each bin on a cumulative histogram is the sum of the values in a bin and all previous bins. Using a cumulative histogram is a good way to summarize your data.
Creating a cumulative histogram:
- Create your histogram by clicking the Home | New Graph | Statistical | Vertical Histogram () command.
- Select the histogram data file and click Open.
- Click on the Histogram object in the Object Manager to select it.
- Click on the Plot tab in the Property Manager.
- Click the next to Bins.
- Check the box next to the Display as cumulative plot option. The counts are automatically added to the previous bin to create each new bin.
- To display cumulative frequencies, check the box next to the Display as relative frequency option, as well. When finished, your cumulative histogram will look like the graph below.
A normal counts histogram is on the left. The cumulative counts histogram is on the right.
Updated May 2023