Statistic Sigma Proportion Count Binomial p-chart np-chart Poisson u-chart c-chart
The CCB makes a few decisions for you based on the variable selected. For example, if there is no X variable, a c-chart is originally created because there is no way to estimate the binomial distributions. Upon adding an X variable (or lot size), the platform switches to a np-chart if the count per subgroup is less than the subgroup sample size. Once the basic chart is created, you can use the menus and other options to change the type, the statistic, and the format of the chart.
 • p-charts display the proportion of nonconforming (defective) items in subgroup samples, which can vary in size. Because each subgroup for a p-chart consists of Ni items, and an item is judged as either conforming or nonconforming, the maximum number of nonconforming items in a subgroup is Ni.
 • np-charts display the number of nonconforming (defective) items in subgroup samples. Because each subgroup for a np-chart consists of Ni items, and an item is judged as either conforming or nonconforming, the maximum number of nonconforming items in subgroup i is Ni.
 • c-charts display the number of nonconformities (defects) in a subgroup sample that usually, but does not necessarily, consists of one inspection unit.
 • u-charts display the number of nonconformities (defects) per unit in subgroup samples that can have a varying number of inspection units.

Help created on 9/19/2017