Data Analyst · Runs on ChatGPT GPT-5.5 · 5 cr./message

AI assistant: what the numbers say and what they do not

Working through tables and metrics: how to count, what to compare with and why a pretty correlation proves nothing.

What Data Analyst returns

The shape of the answer is fixed in advance: gaps, duplicates, outliers, methodology changes, seasonality. Two conversations about the same task therefore end in the same form: the answer can be compared with the previous one and passed on without asking for a rewrite.

“Check data fitness before conclusions: gaps, duplicates, outliers, methodology changes, seasonality, survivorship.”

What Data Analyst will not do

The role has 7 rules, one of them an outright prohibition. We quote them as written rather than paraphrase: promising “it can do anything” is cheaper, but then people meet the limit only after paying for a message. Here it is visible beforehand, and a neighbouring role can be picked straight away.

“Never invent numbers, data rows, industry benchmarks or study results; if data is missing, say exactly what is missing and how to obtain it.”

How Data Analyst runs the review

The rules describe the role as “data analyst”. Below is how it holds the review, in the same words it is given before your first message — and manner is exactly what separates one companion from another.

“Compute step by step and show the formula, not just the result.”

“Separate observation, hypothesis and conclusion; never present correlation as causation and name alternative explanations explicitly.”

“Finish with a one-sentence answer to the original question and, next to it, what that answer does not prove.”

What a message to the “What the numbers say and what they do not” role costs

You are charged per message sent, not per month of access: a role needed once a quarter costs nothing in between, and it needs no line of its own in the budget.

5 credits per messageThe price is the same for a short and a long message: what counts is the send, not the length.No subscription feeTen messages a month cost the price of ten messages: you pay for what happened, not for a plan.

What Data Analyst flags for checking

The danger is not a gap in knowledge but a confident tone over a guess: people act on such answers, and the cost of the mistake lands on the person, not the program. So the rules say separately what to flag, what to warn about and when to ask for a source.

“First establish the question behind the numbers, the data source, period, units and how the data was collected: without this any figure is decoration.”

“Flag small samples and short periods explicitly and do not build confident forecasts on them.”

Three questions Data Analyst offers first

A click opens the chat with the message already typed. These are not our examples but the role’s own suggestion: the same three lines stand in the empty conversation window.

Work through my table

How to compare two periods properly

Is this a trend or noise?

Questions about this assistant

Quick answers

Yes: the send is charged, not the quality of the answer — 5 credits per message. That is exactly why the role starts with clarifying questions: one precise question costs less than three vague ones.

ChatGPT GPT-5.5. A role is character and rules, but a model executes them, so the model is fixed for this assistant: a weaker one would turn analysis into paraphrase, an unnecessarily strong one into overpaying. You can switch models inside the chat.

Both roles sit on the “Code and technology” shelf but answer by different rules: the rules of Data Analyst are quoted in full on this page, and those of “Prompt Engineer” on its own. The full shelf is listed at the end of this page.

Yes, the conversation stays in your account history: you can return to it, continue from the same point or start over.

An assistant is AI, not a person: it helps with a task but does not replace a doctor, therapist, lawyer or other qualified professional. Verify important decisions and facts against a primary source.

How Data Analyst differs from a plain chat

In a plain chat the framing is on you: the order of questions, the limits, the requirements for the answer — from scratch in every new window. Here it is already written: 7 rules, 1 prohibition of them, all quoted on this page. You never have to restate them.

✓ Rules: 7, prohibitions: 1
✓ Catalogue shelf: Code and technology
✓ A program answers, not a person: it replaces no doctor, lawyer or therapist