Histogram | One-Sided Tolerance
It's easy to run a Histogram, with a One-Sided / Unilateral Tolerance, using QI Macros SPC software.
To Create a One-Sided Tolerance Histogram, follow these steps:
- Run a Histogram and select "Cancel" when asked for either the USL or LSL, depending on what aspect of your data you wish to have one-sided. You may use the default spec limits or input your own.
- Below is an example of a One-Sided Histogram, created with the LSL cancelled. Notice the Cp, CpL, Cpm, Cr, Pp, and PpL metrics are not calculated. These metrics can't be calculated with only one spec limit.
(If you select, "Cancel" on both the USL and LSL prompts, you will receive a chart with minimal metrics.)
How to create a one-sided / unilateral tolerance histogram, using QI Macros Histogram Template:
Open the histogram template under Capability Templates > Histogram with Cp Cpk. Click on the histogram tab and go to the cells in the template where the USL and LSL are defined (e.g. P1 and P2). To create a one-side histogram, delete the value in the cell and leave it blank. Do NOT put a "0" into the cell.
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