Np Chart Calculations
Plotted statistic for the Np Attribute Control Chart
the number of items in a sample meeting a criteria of interest
Center Line
where m is the number of groups included in the analysis.
UCL , LCL (Upper and Lower Control Limit)
where n is the sample size, np-bar is the Average count , and p-bar is calculated with the following Np chart formula:
The Np chart formula are easily calculated for you using our SPC software.
See also:
