p: Proportions

Proportion (p) charts are used for monitoring (as the name implies) proportional data.

The p chart below shows the monthly proportion of patients that experienced a harmful event across 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 p - Proportions from the Chart Type drop-down in Data Settings.