Process Capability Analysis

Process Capability Analysis

Process Capability Analysis

Description

Process Capability Analysis is a computational method for comparing the output of a manufacturing process to its engineered specification limits.

Why to use

Statistical Analysis

When to use

To compare the output of a process with its specification limits.

When not to use

 On non-normal or textual data.

Prerequisites

The data should follow a normal distribution.

Input

Numerical data

Output

  1. Process Data
  2. Process Capability Report for
    1. Overall Capability
    2. Within Capability

Statistical Methods used

  • Shapiro Wilk’s Test for Normality
  • Descriptive statistics

Limitations

It can be used only on numerical data.


The Process Capability Analysis is mainly used in the manufacturing industry to measure the performance of a process. It checks how well the given process meets a set of specification limits by comparing the observed and expected values. It also takes into consideration a Lower Specification Limit and Upper Specification Limit. The values that lie between these two are considered as acceptable values. The output of Process Capability Analysis shows various performance metrics and W Statistic, and p-Value for Shapiro Wilk’s Test for Normality.
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