Pareto Analysis

Pareto Analysis identifies the "vital few" categories accounting for the majority of occurrences (the 80/20 rule). Focuses improvement efforts where they yield the greatest return.

Step 1 — Provide your data

  • Categories — names (e.g. defect types, complaint reasons)
  • Counts — frequency for each category
  • Threshold (optional, default 80%)

Supports Excel Import, Sample Data Generator, and Manual Entry.

Step 2 — Results

  • Sorted category table — count, percentage, cumulative percentage
  • Vital few — categories within threshold
  • Trivial many — remaining categories
  • Pareto chart — bars (descending) + cumulative line + threshold marker

A UniversalChatBot is available for discussion.

Statistical methods used

Algorithm:

  1. Sort categories by count descending
  2. Compute percentage and cumulative percentage
  3. Classify as "vital few" until cumulative crosses threshold

Default threshold: 80% (the classic Pareto principle).

No formal hypothesis test — Pareto is descriptive and prioritisation-oriented.

Interpretation example: "3 vital few categories (82.5% of total) out of 12 total. The top 3 should be prioritized for improvement."

The vital few categories are where improvement effort yields the greatest return.