Interpretation & Calculations
Plotted statistic for the C Attribute Control Chart
the count of occurrences of a criteria of interest in a sample of items
where m is the number of groups included in the analysis.
UCL , LCL (Upper and Lower Control Limit)
where n is the sample size and c-bar is the Average count
The C chart formula are easily calculated for you using our SPC software.
Learn more about the SPC principles and tools for process improvement in Statistical Process Control Demystified (2011, McGraw-Hill) by Paul Keller, in his online SPC Concepts short course (only $39), or his online SPC certification course ($350) or online Green Belt certification course ($499).