R for Industrial Engineers

Six Sigma Process with R

Analyzing Process Capabilities

Image by Bill Oxford available at Unsplash

Six Sigma Process

A Six Sigma process is one in which 6 standards deviations are located between its mean and the nearest specification limit. It yields 99.999998% of its population within the lower and upper specification limits and is considered a world-class industry process due to the complexity and efforts to reach it.

Its distribution is represented as follows (assuming a mean of 10 and a standard deviation of 1):

Relevant Concepts to Understand

• Target: desired value of a measurement.
• USL (Upper Specification Limit): maximum tolerance for a specific measurement accepted by a customer.
• LSL (Lower Specification Limit): minimum tolerance for a specific measure accepted by a customer.