What is c chart?

A c chart is a type of control chart used in statistical quality control to monitor the number of defects or nonconformities in a sample or process over time. It is typically used when the number of defects can vary from sample to sample, rather than being fixed at a certain value.

The c chart plots the number of defects in each sample or subgroup, with the centerline representing the average number of defects and control limits indicating the acceptable variation in the number of defects. The chart helps identify patterns, trends, and outliers in the data, allowing for early detection of issues in the process.

C charts are often used in industries such as manufacturing, healthcare, and service sectors to monitor and improve quality by identifying and addressing the root causes of defects. They are a valuable tool for ensuring consistent and reliable performance in processes that produce discrete items or outcomes.