u: Rates

Similar to a p chart, the u Chart is used for monitoring a rate of events over time. With these kinds of data, the numerator may exceed the denominator

The u chart below shows the rate of adverse events per patient day over an 18-month period.

To construct this chart, you provide the numerator variable (number of events) in the ‘Outcome/Numerator’ field, the denominator variable (number of opportunities) in the ‘Denominator’ field, and the date variable (Month) in the ‘ID Key’ field (depicted below). Then, select u - Rates from the Chart Type drop-down in Data Settings.