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Pareto Chart Generator

Read a CSV of issues and produce a ranked Pareto chart (bars + cumulative % line) as a self-contained SVG.

Type: Script Domain: Operations Vertical: LSS Version: v1.0.0 Last tested: 2026-06-03 Cost per run: Free (Python stdlib only)

:material-github: Source on GitHub · Drive canon · CHANGELOG

Trigger prompts

Generate a Pareto chart from issues.csv, count the "Defect" column, output to pareto.svg.

Use skill-pareto on the attached Q2 defect log, top 10 only.

Build a Pareto for "Equipment failure modes" — count column, output to chart.svg.

What it produces

A self-contained SVG (no JS, no external fonts) with:

  • Bars sorted by count, descending
  • Cumulative % line (blue) with markers
  • 80/20 line (subtle)
  • Y-axis: count (left) and cumulative % (right)
  • X-axis: category labels (truncated to 18 chars, rotated 30°)
  • Title + total count

Plus an ASCII summary to stdout for quick review.

Sample ASCII output — Q2 2026 pipeline defects

Pipeline Defects — Q2 2026 — top categories:
      6   24.0%  ██████████████████████████████ Valve leak
      4   40.0%  ████████████████████ Weld porosity
      2   48.0%  ██████████ Surface corrosion
      2   56.0%  ██████████ Pipe dent
      2   64.0%  ██████████ Coating failure
      2   72.0%  ██████████ Improper torque
      2   80.0%  ██████████ Operator error
      2   88.0%  ██████████ Material defect
      1   92.0%  █████ Misalignment
      1   96.0%  █████ Thread damage

Inputs

Defect,Date,Location
Weld porosity,2026-05-01,Block 4
Valve leak,2026-05-02,Block 5
...

The --column flag specifies which column to count. Use --top N to limit categories.

Install

python3 canon/operations/lss/pareto-script/pareto.py \
  --input canon/operations/lss/pareto-script/issues.example.csv \
  --column "Defect" \
  --output pareto.svg \
  --title "Pipeline Defects — Q2 2026"

No installs needed.

Source files

File Path Version
Source CSV spec drive/00-canon/operations/lss/pareto-script/00-pareto-v1.0.0-2026-06-03.csv v1.0.0
Canonical script canon/operations/lss/pareto-script/pareto.py v1.0.0
Example CSV canon/operations/lss/pareto-script/issues.example.csv v1.0.0
CHANGELOG canon/operations/lss/pareto-script/CHANGELOG.md v1.0.0

Version + last tested

  • v1.0.0 — released 2026-06-03
  • Last tested: 2026-06-03 against the Q2 2026 example CSV (25 defects, 11 categories). Result: 6.4 KB SVG, Valve leak = #1 (24% of all defects), Weld porosity = #2 (40% cumulative).

Known limitations

  • SVG only (no PNG export built-in; use rsvg-convert or Inkscape to convert).
  • No date-range filtering (filter the CSV first).

Pairs with

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