AI visibility
AI Share of Voice: Check the Data Before You Read It
A share-of-voice figure only means something when you know the sample behind it, how citations were counted, and which engines were observed. Here is the order to check them in.
Before you read a share of voice on AI answers, ask what data you need in order to interpret it: the sample the figure is calculated on, the formula used to count citations, and the coverage of the engines observed. Picture opening a report on your brand's citations on ChatGPT and finding a percentage next to the name. Without knowing how many answers were observed, how a link or a mention was defined, and which engines are included, that number cannot be compared with anything. RankAI starts here: a share of voice is readable only when those three elements are explicit.
Why sample, formula and coverage change what the share means
A share of voice is a ratio. If the denominator changes, the result changes even when the citations stay the same. If the formula treats a text mention and a link the same way, the ratio measures something different from a formula that separates the two. If coverage includes only some engines, the share describes those engines, not the whole landscape of AI answers. That is why RankAI does not present the share as an absolute value: it pairs it with the conditions under which it was calculated.
The RankAI checklist: three things to verify before you read the share
What follows is an operational proposal from RankAI, not a universal standard. It is meant to help you decide whether a share of voice is readable and comparable.
- Sample. Verifiable criterion: the report must state how many answers the share is calculated on and the period in which they were collected. If the number of answers is missing, the share cannot be verified and should be treated as indicative, not as a measurement.
- Formula. Verifiable criterion: the formula is adequately declared when it specifies whether a link counts as a citation, whether a mention without a link counts, and whether multiple citations in the same answer count once or more than once. Without those three details, two shares with the same label can measure different things.
- Coverage. Verifiable criterion: the report must list the engines included. RankAI names ChatGPT, Perplexity, Gemini, Grok and Google AI; Claude and Grok are measured only after you connect them. Gemini and Google AI Overviews are not the same observation and must be read separately.
A qualitative comparison
Take two shares labelled the same way for your brand on ChatGPT. The first is calculated on a declared sample, with a formula that separates links and mentions, and with the list of engines covered. The second is calculated on an undeclared sample, with a formula that adds links and mentions together, and with coverage left unspecified. The two shares are not comparable: the difference does not come from the brand but from the conditions of measurement. Before you read which one is higher, check whether the sample is declared, whether the formula separates the cases, and whether coverage is explicit.
What this piece contributes is an order of reading, not a list of prohibitions. RankAI suggests checking the three items in the order sample, formula, coverage, because each step changes how you interpret the next. If the sample is not declared, the formula cannot be verified in its effect: you do not know how many answers it applies to. If the formula is not declared, coverage is not enough: knowing which engines are included does not clarify how citations are counted. If coverage is not declared, the share holds only for the engines actually observed, not for all of them. This order keeps you from blaming coverage for a difference that comes from the sample or the formula. It is an operational proposal from RankAI, not a universal standard: it makes the reading path explicit, it does not replace the report's documentation.
What to do when a measurement is missing
When a visibility measurement is not available, RankAI shows it as N/A, never as zero. Zero means the measurement was taken and the result was null; N/A means the measurement is not available. Confusing the two leads you to read a missing data point as an absence of citations. Before comparing two shares, check that both are actual measurements and not N/A.
A limit you can verify
This checklist does not set a minimum sample size or a preferred formula: it only sets out which information must be present for a share to be readable. If the report does not declare sample, formula and coverage, the share can be read as an indication, not as a comparable measurement. For the full picture on AI visibility measurement, see the in-depth page.