u Chart in Excel

The purpose of a u chart is to determine stability of "counted" data (e.g., errors per bill, dents in a car door, etc.) when there can be more than one defect per unit and the sample size varies.

u chart data looks like this:

example of u chart data

Example of a u chart created using the QI Macros SPC Software for Excel.

The stair step or skyline control limits are the result of the varying sample sizes.

u chart in Excel created with the QI Macros software

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