# What we measure, dated and re-measured.

> Numbers we measure ourselves. Each page says how it was measured, when each figure was last true, and what changed since the last reading, so a figure you quote carries its date.

Canonical: https://heddle.pro/statistics

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## AI answer citations

How often ChatGPT and Perplexity cite ranking pages, Reddit, YouTube and Wikipedia when asked 36 buying questions in six categories, measured weekly.

## What the numbers are for

If you sell to people who ask an assistant who to hire or what to buy, these figures show what that assistant reads before it answers. Today the answer is mostly ranking and comparison pages written by someone else, so the lists your category appears on matter alongside your own site.

## How they are measured

The same questions go to the same engines every week, and we read the logged-out answers a buyer would see.

A failed answer is left out of every figure instead of being counted as citing nothing. A figure measured over fewer than ten answers isn't published at all, because a share of five answers moves twenty points on one change, and a reader quoting it would be quoting noise.

## Questions

### Where do these numbers come from?

Our own measurement. Each week Heddle puts the same buying questions to ChatGPT and Perplexity and records what every answer cites; each page names the questions, the engines and how each figure is counted, so you can repeat it.

### Can I quote them?

Yes, with the date beside it in the table and a link to the page.

### What can't they tell you?

How assistants answer the questions your own buyers ask. Buyers phrase things their own way, and those answers can lean on different sites. Heddle runs the same measurement on your buyers' questions and shows which answers name you and which lists they cite.

### How often do they change?

They are measured every Monday. A figure changes on the page when it moves by a point or more; a move of more than ten points waits for a person to check it first.

## Ready to get found? Check your site, talk to us, or see the plans.

Tell us about your business and who buys from you. On a short call we'll show you the searches your buyers make where you don't show up yet, and what the agents would do about them in their first month.