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GR&R Analysis Tool — Wiki

Open-source Gauge Repeatability & Reproducibility analysis tool following AIAG MSA 4th Edition. Produces audit-ready PDF reports and interactive HTML dashboards. Free, no license required.

Repository: LSaiko/grr-analysis-tool

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Wiki Contents

Page	Contents
Methodology and Calculations	AIAG math, K-constants, variance decomposition, CI
CLI Reference	Every flag documented with examples
Data Format	CSV format, validation rules, study design tips
Understanding Your Report	How to read the PDF and HTML dashboard
Customizing the Tool	Thresholds, constants, tolerances, branding, scripting
Industry Study Design Guide	Red flags and guidance for 8 industries
Competitive Comparison	vs. Minitab, JMP, SigmaXL, QI Macros
Regulatory References	Full standards index across all industries

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Quick start

pip install -r requirements.txt

python grr_tool.py \
  --generate-sample --input sample.csv \
  --output report.pdf --dashboard dashboard.html \
  --equipment "Mitutoyo 293-340-30" --operator "J. Martinez"

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Acceptance criteria

%GR&R	Verdict	Action
<= 10%	Acceptable	Gage approved for product acceptance
10-30%	Marginal	Investigate dominant source (EV vs AV)
> 30%	Unacceptable	Do not use — identify and correct root cause

ndc >= 5 required in all cases.