# Data Analysis

$$\ C_p = {USL - LSL \over 3\sigma}$$ $$\ C_{pk} = Min \ \left[ {(USL- mean) \over 3\sigma} \ , \ {(mean - LSL) \over 3\sigma} \right]$$ \ \begin{align} USL& = Upper \ Spec \ Limit \\ LSL& = Lower \ Spec \ Limit \\ \sigma& = Standard Deviation \\ C_p& = Process \ Capability \\ C_{pk}& = Process \ Capability \ Index \end{align}

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