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| Can I create a cumulative histogram in Grapher? |
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Grapher does not have an option for a cumulative histogram, but you can create a graph that shows the same information. To do this, follow these steps:
1. Create your histogram using the Graph | 2D Graphs | Histogram command.
2. Select your histogram data file and click Open.
3. The histogram is now displayed. Change any column or bin properties in the property inspector.
4. Click once on the histogram and choose Graph | Export Plot Data. A new worksheet is created.
5. Column A contains the Range of values for each bin. Column B contains the Count of the number of points that were in this bin. This is what was actually displayed on the histogram. Column C contains the Upper limit value of the bin. Column D contains the Cumulative Frequency. You can use column D in combination with A and C to create a cumulative histogram.
6. In the image above, the Range is 10 units. Divide your range in half (5 for this example). Now, highlight column C and choose Data | Transform. In the Transform equation, type C=C-5, where 5 is the half range value. Click OK.
7. Highlight column C and D and choose New Graph | 2D Graphs | Bar Chart. The cumulative histogram will be displayed.
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