PChart Class

public sealed class PChart : ControlChart<PChart>

Public NotInheritable Class PChart
	Inherits ControlChart(Of PChart)

public ref class PChart sealed : public ControlChart<PChart^>

[<SealedAttribute>]
type PChart = 
    class
        inherit ControlChart<PChart>
    end

Inheritance

Object  →  ControlChart  →  ControlChart<PChart>  →  PChart

The P chart is used when the fraction of nonconforming items per subgroup is being monitored. When sample sizes vary, each subgroup has its own control limits; when the sample size is constant, the limits are identical across all subgroups.

Use the Series property to access the result series. It returns a PointwiseLimitSeries when variable sample sizes produce per-point limits, or a FixedLimitSeries when a constant sample size was used.

Typical usage (variable sizes):

double[] counts = { 2, 3, 1, 4, 2 };
double[] sizes  = { 50, 60, 40, 55, 45 };

// Phase I — establish limits
PChart chart = new PChart(Vector.Create(counts), Vector.Create(sizes));
chart.Analyze();

// Deploy for production monitoring
PChart deployed = (PChart)chart.Deploy();

// Phase II — apply to new data with new sample sizes
double[] newCounts = { 1, 2, 3 };
double[] newSizes  = { 50, 55, 60 };
PChart applied = deployed.Apply(
    Vector.Create(newCounts), Vector.Create(newSizes));

Reference