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Better decisionsunderuncertainty.

Cumulant Research

Research model

Cumulant combines human judgment, AI-assisted investigation, and deterministic analysis to study difficult questions in finance, allocation, and research reliability. The aim is not automated judgment. It is greater investigative reach without losing traceability or accountability.

Evidence fieldMultiple analytical paths remain connected to the question that produced them.

Research that leaves a record.

Cumulant studies financial inference, capital allocation, humanitarian finance, replication, and the reliability of AI-assisted research.

The question determines the method. Literature, data, code, criticism, and revision remain part of one inspectable record.

AI extends the investigation. Frozen artifacts, reproducibility checks, and human review keep responsibility with the researcher.

A painted violet boundary holds competing marks inside a deliberate field.
Boundary settingQuestions, constraints, and release rules are declared before results are interpreted.
Research methodA question moves through design, investigation, review, and preservation.

From question to inspectable result.

Cumulant does not force questions through one fixed pipeline. The question determines the method.

Across projects, a small set of disciplines recurs: trace the evidence, test alternatives, reproduce the result, and require human review before release.

Ask
01Find the puzzle

Identify the tension, anomaly, or decision that merits investigation.

02Study the field

Review prior work, competing explanations, and unresolved gaps.

Design
03State the question

Define a specific question and the boundary of the claim.

04Choose the method

Select a design that fits the question instead of forcing a standard recipe.

05Build the evidence

Acquire, validate, and preserve data and sources with provenance.

Investigate
06Analyze

Run deterministic code and save machine-readable outputs.

07Challenge

Use critical review to search for leakage, weak identification, alternative explanations, and unsupported claims.

08Stress-test

Test alternate samples, variables, models, windows, costs, assumptions, and out-of-sample behavior.

Preserve
09Verify

Trace numerical claims and citations to saved evidence.

10Reproduce

Rebuild results from preserved inputs, code, seeds, and configurations.

11Human review

Require human evaluation of the design, interpretation, limitations, and release decision.

12Release

Publish a versioned output with methods, code, data status, limitations, and correction history.

Different strengths. One accountable process.

AI extends the investigation. It does not inherit responsibility.

Human judgmentSets the question, boundaries, interpretations, and release decision.
AI-assisted investigationSearches, compares, drafts, and surfaces alternatives for review.
Deterministic recordComputes, tests, reproduces, and preserves the inspectable artifact.

Current research.

Cumulant works across five connected programs concerned with uncertainty, allocation, inference, and research reliability.

Financial inference & model risk

Statistical inference and model reliability in financial data, where limited decision counts and flexible analysis can make findings fragile.

FOCUS

Backtest inference

Decision timing

Researcher degrees of freedom

Model selection

False discovery

Robustness

Event studies

Statistical fragility

Many painted model paths diverge from one observed trace, with fragile paths fading at the edges.
Financial inference & model riskConceptual visual for Backtest inference, Decision timing, Researcher degrees of freedom. It is not an empirical result.

Selected work.

Current and completed investigations, presented with their actual status, limitations, and evidence record.

Program
Status

Financial inference & model risk

Structure-Preserving Randomization Inference

Submitted

Portfolios & capital allocation

Diminishing Marginal Risk Reduction

Research note

Humanitarian finance

Portfolio Theory for Humanitarian Organizations

Research in progress

AI-assisted research systems

AI-Assisted Research Validation

Experimental

Research systemsAssisted investigation feeds deterministic records and visible human review.

A research system built to challenge itself.

Software roles help retrieve evidence, write and test code, analyze data, surface alternative explanations, and preserve research state. Deterministic tools produce and verify estimates. External release still requires human-attested review.

Assisted investigationFunctional system diagram. Software assists the work; public release remains a human decision.
Deterministic infrastructureFunctional system diagram. Software assists the work; public release remains a human decision.
Human governanceFunctional system diagram. Software assists the work; public release remains a human decision.

Research beyond the norm.

Independent analysis of the events moving markets, the economy, and policy, one consequential question at a time.

Policy

The Senate's reported grant-rule pause still has no defensible dollar value

Senate appropriators said a funding agreement through Dec. 11 would keep OMB's proposed grant rule from taking effect, but the measure had not passed and Cumulant did not locate official Senate text before publication. Public award records can measure commitments that agencies made, not applications or existing awards that the proposed rule would have changed, so a protected-dollar total would be false precision.

Geopolitics

Brent was down at least 5% after four of five Iran pauses. Shipping data cannot tell us why

Donald Trump said on August 1 that he would hold off planned US strikes if a deal were reached quickly, but Iran said reopening the Strait of Hormuz was not under discussion and a mediator said no agreement existed. In five completed event windows, Brent's EIA spot price was lower on the tenth subsequent observation every time and at least 5% lower four times, but incompatible shipping snapshots and multiple competing influences prevent a causal conclusion.

Tech

The EU can now fine general-purpose AI providers. We put the one-year odds of a first decision at 35%

The European Commission's power to impose fines under Article 101 began applying on 2 August 2026, although the detailed procedural regulation takes effect on 10 August. After tracing the required legal steps and correcting the closest DSA precedent to 833 days, we estimate a 35% chance of a first fine decision by 2 August 2027. [AI Office FAQ](https://ai-act-service-desk.ec.europa.eu/en/faq?faq_category_id=69) [Implementing Regulation 2026/1755](https://eur-lex.europa.eu/eli/reg_impl/2026/1755/oj/eng)

Aerial photograph of large circular oil-storage tanks at the Ras Markaz Oil Storage Park in the desert of Oman.
Energy

Seven OPEC+ producers' June shortfall to IEA targets was 38 times their September adjustment

On 2 August, [seven OPEC+ producers approved a combined 188,000-barrel-a-day production adjustment for September](https://www.opec.org/pr-detail/611-2-august-2026.html). Our reconstruction of the [IEA's June estimates](https://www.iea.org/reports/oil-market-report-july-2026) found a 7.20 million-barrel-a-day shortfall to its implied targets, but that comparison measures scale, not compliance, future production or price impact.

Aug 2, 2:22 PM · 9 min

An old tractor beside rows of corn under a blue sky near Lyons, Georgia.
Banking

The CRA proposal's 85.4% asset figure cannot establish LMI farm-loan coverage

On July 31, the OCC and FDIC proposed limiting mandatory detailed loan reporting largely to banks above $10 billion. Their 85.4% asset statistic does not measure loan-data coverage, which matters because nonmetropolitan places supplied 55.0% of reported small-farm dollars in low- and moderate-income tracts in 2024.

Aug 1, 4:17 PM · 9 min

An empty modern hospital bed beside medical equipment in a private patient room.
Healthcare

Removing ulcer-coded claims still leaves about $4.11 more Medicare spending per hospice day

Medicare payments for services outside hospice increased by $1.536 billion from FY2020 to FY2024. After mechanically removing the approximately $696 million increase in pressure-ulcer-coded carrier claims, CMS data indicate that the remaining spending rose by about $4.11 per hospice day, although the exact figure is unavailable because CMS has not published an unrounded FY2020 denominator matched to the final-rule data.

Aug 1, 1:04 PM · 14 min

Cumulant Research

Operating standard

Every numerical claim is required to trace to a re-derivable artifact. Replication must rebuild reported results. Nulls and failures remain part of the record. Nothing goes public without human-attested review.

Lavender research trajectories move from one question through evidence and review.
Cumulant research modelQuestions branch into evidence, critique, and reproduction before a public record is released.

Built to make research more inspectable.

Cumulant is a developing, independent research initiative founded by Aryan Patel. It studies finance, allocation, and research reliability while keeping verification, judgment, and responsibility visible.

Learn about Cumulant

The rules behind the work.

READ THE PRINCIPLES
01

Evidence before narrative

A compelling explanation is not a substitute for valid evidence.

02

The question determines the method

Methods should fit the question rather than force every project through one recipe.

03

Uncertainty is part of the result

Research should show ranges, instability, and unresolved questions rather than hide them behind one estimate.

04

Null findings belong in the record

A hypothesis that fails still contains information.

05

Reproducibility before persuasion

A result should be inspectable and rerunnable.

06

Criticism improves the work

Alternative explanations and adversarial review reveal where a claim is fragile.

07

AI assists; humans are responsible

Software supports the work. Human researchers approve the design, interpretation, and release.

08

Corrections remain visible

Changes, errors, and revisions stay attached to the record.

09

Claims should match evidence

The language of a conclusion should never exceed the strength of the design.

Bring a question worth understanding.

Cumulant welcomes researchers, statisticians, domain experts, nonprofit practitioners, engineers, independent reviewers, and data contributors.

Collaboration types

Research collaboration

Statistical review

Domain expertise

Nonprofit partnership

Replication

Data contribution

Systems engineering

External criticism

Start a collaboration

Share the question, the evidence available, and where outside scrutiny would help.

THE QUESTION DETERMINES THE METHOD.

EVIDENCE BEFORE NARRATIVE.

UNCERTAINTY IS PART OF THE RESULT.

HUMANS REMAIN RESPONSIBLE.

CUMULANT RESEARCH