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Quality and Process Methods > Pareto Plots > Statistical Details for the Pareto Plot Platform
Publication date: 02/06/2025

Statistical Details for the Pareto Plot Platform

The likelihood ratio Chi-square test statistic computed in the Pareto Plot platform uses the following notation:

• nij is the count for Cause i in Group j.

• Ej is the expected count for Group j. This is the mean count of each group, across causes.

• Ei is the expected count for Cause i. This is the mean count of each cause, across groups.

Likelihood Ratio Chi-Square Test Statistic within Groups

Equation shown here

Likelihood Ratio Chi-Square Test Statistic across Groups

Equation shown here

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