Radar Perene / Archive / science

What is a preprint — and where ours live

◦ Index methodology v2.2 (working papers with DOI). See the methodology.

Science

In January 2020, while medical journals were still organizing their review queues, the first descriptions of the new coronavirus circulated among scientists within days. The channel was not a journal: it was a preprint repository. The whole world watched, perhaps without knowing the name, the parallel circuit through which science talks to itself before any formal stamp.

A preprint is the complete version of a scientific study made public by its own author, in an open repository with a dated record, before undergoing peer review. It is not an informal draft: it is the full text, citable and dated — merely without a journal's seal yet.

The word inherits from the age when publishing literally meant printing. What survived of the etymology is the idea of precedence: the study exists, circulates and can be criticized before the formal rite is over.

Why make public what no one has validated

The question is legitimate: what is the value of a text no independent referee has approved? The scientific community's answer has three layers.

The first is priority. Science has an old chronology problem: who got to an idea first? The preprint solves it by public record — the deposit date is verifiable by anyone, and the author does not depend on the speed of an editorial committee to mark a place in line. It works as a notary of ideas: it does not certify that the idea is good, it certifies when it was declared.

The second is early criticism. A public study attracts readers, and readers find flaws. A good share of preprints changes version after circulating — the repository keeps every version, each with its own date, and the text's evolution stays visible. Formal peer review examines a study two or three times; the open world examines it as many times as it wants.

The third is access. A preprint is free by definition, in a system where the final article often sits behind expensive subscriptions.

The cost of that openness is known and worth stating plainly: a preprint can be wrong, and some are. The mature reading treats the genre neither as provisional truth nor as unvalidated waste — it treats it as what it is: a study at a declared stage, whose strength depends on the method it exhibits, not on the seal it does not yet have. On what the seal adds, the house has written in what is peer review.

Preprint, working paper, article: three stages, not three qualities

The terms blur because the borders are matters of tradition, not essence. Working paper is the preferred name in economics and finance for the same object — a complete, public study prior to formal review — with one nuance: the working-paper tradition (the American NBER's, the Central Bank of Brazil's) treats the document as part of a numbered institutional series. The preprint is the genus; the working paper, the dialect economics speaks. The refereed article is the next stage of both — when and if the author chooses to walk it.

A Brazilian detail deserves the record: in Portuguese, search engines answer "working paper" with accounting-audit material ("papéis de trabalho") — a different object, with no kinship. That confusion has already been dismantled in what is a working paper.

Where ours live

This house's production follows exactly that circuit. Radar Perene's studies are published as working papers on Zenodo — the open repository operated by CERN, the European physics laboratory — where each deposit receives a DOI, the permanent identifier that keeps a document citable and traceable even if web addresses change. In numbers: six working papers are online, each with an active DOI and public versioning — from The Perene Risk Index, which documents the concept behind the house's risk-appetite index, to The Brazilian Macro Regime Score, the only one in the series with fully open weights — plus a data package with integrity verification. The complete list, with every identifier, lives on the site's research page.

The versioning deserves its own sentence: several studies in the series are on their second or third public version, and the earlier versions remain accessible in the repository. The reader can see what changed — including where the new version revised findings of the old one. It is the part of the open circuit that says the most about method: the record of the road, not just of the destination.

Frequently asked questions

Does a preprint have scientific validity?

It has the value of the method it exhibits. It has not passed independent review, and careful reading discounts that; in exchange, it is public, dated and citable, and open criticism has taken down fragile preprints faster than many formal committees.

Can a preprint be cited?

Yes, and the practice is common — with the stage identified. A repository DOI makes the citation stable and verifiable.

Does a preprint become an article later?

Frequently. The classic circuit is preprint → criticism → new version → formal review. But there is no obligation: part of the economics literature circulates for decades as working papers, cited and influential, without ever changing stage.

What is the difference between depositing on Zenodo and publishing on one's own site?

The record. A repository with DOI guarantees a verifiable date, preserved versions and a permanent address, maintained by an institution independent of the author. One's own site proves no precedence and does not prevent silent editing of the past.

A public, dated study still has to answer the hardest question in applied statistics: is a detectable result a result that matters? That is the subject of statistical significance is not economic relevance →

House readings: today's note, in the Daily · the archive of episodes, in the Atlas.

Walking through the house's complete working-paper series, version by version, is open reading for anyone — and talking about what it teaches is something the house does gladly.