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OpenTrainPhD

Statistician & Experimentation Expert

You will create and evaluate AI training data focused on causal inference and A/B testing. Your work will test whether AI models can reason correctly about study design, statistical analysis, and results.

Field
Math & statistics
Where
United States, Albania, Algeria, Antigua and Barbuda, Armenia, Australia +89 more
Hours
up to 10/week
Asks for
PhD
Posted
4 days ago

Pay data for your profession: Math AI trainer jobs · PhD AI trainer jobs

How this pay compares

At $115/hr (the midpoint of $80 to $150), this role pays more than 70% of the 54 open math & statistics roles with a listed pay range, above the median of $83.

Open math & statistics roles that ask for a PhD have a median of $83/hr (17 roles).

Among platforms with 10 or more priced math & statistics roles, Alignerr has the highest median ($185/hr across 23 roles) and OpenTrain AI the lowest ($49/hr across 26).

OpenTrain AI roles that closed since late October stayed listed a median of 31 days (122 roles). OpenTrain AI posted this one 4 days ago.

Computed from 2,746 open roles we track across Mercor, micro1, Handshake AI, Alignerr, Appen and OpenTrain AI, refreshed daily. Midpoints of listed ranges; “up to” ceilings are left out of medians.

What you would earn at this rate

Per week, before tax

$1,150

Per month, if the work is steady

$4,983

Tax
Contract pay arrives with no tax withheld. A US contractor at this rate and these hours would set aside about $1,260 a month for self-employment tax plus federal income tax at the 12% bracket (25%, before state tax). Outside the US, your own country's rules apply.

Assumes paid hours only; unpaid assessments, onboarding and gaps between projects lower the real figure. Full take-home calculator · Track what you actually earn

Open math & statistics roles on each platform

The same kind of work, priced on every platform we track, with the best-paid open role on each.

PlatformOpenMedianBest-paid open role
Alignerr23$185/hrApplied Formal Methods Researcher (Lean 4)$170-200/hr
Mercor4$88/hr4 pricedMathematics Domain Expert$90-140/hr
OpenTrain AIthis role26$49/hrResearch Scientist: Formal Methods, Computational Science$135/hr
Handshake AI6up to $75/hrMath ExpertUp to $75/hr

“Up to” rows list only ceilings, so their median is a maximum, not comparable with the range midpoints above them.

All 60 open math & statistics roles →

The full listing

As posted on OpenTrain AI. See the original

The work

You will create and evaluate AI training data focused on causal inference and A/B testing. Your work will test whether AI models can reason correctly about study design, statistical analysis, and results.

  • Write realistic statistics scenarios covering study design, analysis, and interpretation.
  • Create reference answers that explain the reasoning behind modeling choices.
  • Review AI model outputs for sound methods and correct interpretation.
  • Identify analyses that look rigorous but lead to invalid conclusions.
  • Apply expert judgment in experimental design, causal inference, and A/B testing.

What it pays and takes

This is an ongoing, independent contractor role. The work is fully remote and asynchronous, with flexibility to change your schedule from week to week.

  • Pay: $80 to $150 per hour, paid weekly through Stripe.
  • Hours: At least 10 hours per week, with no maximum.
  • Location: Remote, open to candidates in the countries specified for this role.
  • Language: Fluent English.
  • Education: An advanced degree in statistics, biostatistics, or a closely related quantitative field.
  • Experience: At least two years of applied statistics or experimentation experience.
  • Skills: Strong knowledge of experimental design, causal inference, or A/B testing.
  • Technical skills: Fluency in R or Python for statistical analysis.
  • Communication: Ability to document and explain modeling decisions clearly.
  • Helpful background: Large-scale experimentation platforms, Bayesian methods, instrumental variables, synthetic control methods, or a PhD in statistics, biostatistics, or econometrics.

How it works

Apply on OpenTrain with your resume, then complete the application on the hiring site.

About AI training work

AI training is the human work behind systems that learn from examples, including writing and rating model responses and checking whether outputs are accurate and well reasoned. People with advanced statistical expertise are paid to create difficult examples and judge model quality in specialized areas.

From applying to your first payment on OpenTrain AI

  1. 1

    Create a profile

    Create a free OpenTrain profile with your domains, languages and hourly rate.

  2. 2

    Apply

    Apply to the listing. Some listings hire through OpenTrain; others send you to the hiring platform.

  3. 3

    Funded milestones

    The client funds each milestone before work starts.

  4. 4

    First payment

    OpenTrain pays out to your connected payout method when the client approves the milestone. It doesn't publish a fixed payout schedule.

Sources: OpenTrain: AI training careers, OpenTrain docs: invoicing and payouts

Full OpenTrain AI profile: watch-outs and the public record →

Pay history

OpenTrain AI has listed this role at $80-150/hr since Nov 10, 2026 with no change.

Across OpenTrain AI's math & statistics roles, the median listed pay was $25/hr on Nov 1, 2026 (18 roles) and is $49/hr as of Nov 11, 2026 (26 roles).

What workers report about OpenTrain AI

Anonymous reports from people who applied or worked there: whether they got work, what they were paid and how fast.

Other math & statistics roles

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