# Rectifies

> Rectifies measures AI search visibility using statistically rigorous
> methodology. We track citation share across ChatGPT, Perplexity,
> Claude, and Google AI Mode using bootstrap confidence intervals and
> mixed-effects logistic regression. We treat AI citation data the way
> an epidemiologist treats a survey: with appropriate uncertainty,
> platform-specific sampling, and explicit methodology transparency.
>
> Methodology v1.0. Last updated 12 May 2026.
> Code: github.com/rectifies. Data: huggingface.co/rectifies.

## Methodology
- [Methodology v1.0](/methodology): Full statistical methodology document
- [Changelog](/changelog): Methodology and engine drift change log
- [What we don't measure and why](/methodology#exclusions): Anti-vanity-metric positioning

## Research
- [Cross-Platform Citation Overlap](/research/cross-platform-overlap-2026)
- [ChatGPT Weekly Domain Rotation](/research/chatgpt-weekly-rotation)
- [Perplexity Freshness Premium](/research/perplexity-freshness-premium)

## Case Studies
- [Amvia — B2B Telecoms](/case-studies/amvia)
- [Comparefibre — B2C Fibre Comparison](/case-studies/comparefibre)
- [Surfaceloop — EASM Cybersecurity](/case-studies/surfaceloop)

## Crawler
- [Rectifies Citation Research Crawler](/crawler): User-Agent, robots.txt, IP ranges, opt-out