Design of Experiments Guide > Prospective Sample Size and Power > Sigma Quality Level Calculator > Statistical Details for the Sigma Quality Calculator
Publication date: 08/13/2020

Statistical Details for the Sigma Quality Calculator

Calculations for the sigma quality calculator are based on the definition of sigma quality level σq for d defects in n opportunities:

From this definition, d and n can be calculated as follows:

where Φ() is the standard normal cumulative distribution function and Z1-d/n is the (1 - d/n)th quantile from the standard normal distribution.

Want more information? Have questions? Get answers in the JMP User Community (community.jmp.com).
.