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Evidence · Preprints · continued

Coming back to: Why a preprint's supplementary material is often the best part posts 91–117

This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.

GV
g.verhoevenTL228 Jun 2026#91
f.fenwick, post #41: A preprint reporting a null result is more likely to stay a preprint, which biases the published literature and makes preprint servers more valuable rather than less. Written from notes rather than memory, which is why the numbers are specific. Go to post

Say it is a preprint in the first line rather than the last. Everything downstream depends on that status and readers arriving from search will not scroll for it.

8 likes in reply to #41 30d
Z
ZieglerTL3Regular29 Jun 2026#92
n.lehtinen, post #21: Reading rather than contributing, but this is the most useful thread I have found on it. Go to post

Confirming post #89 from a second method, which matters more than confirming it from a second person.

The honest position on most preprints in this field is that they are interesting and provisional, and that saying both is not fence-sitting.

2 likes in reply to #21 29d
MD
m.dumitruTL230 Jun 2026#93

Appreciated. The plain phrasing does more work here than a longer post would.

0 likes 28d
DW
diluent_watchTL2Member1 Jul 2026 · edited#94

Reading a preprint properly means doing some of the reviewer's job: methods first, then whether the analysis matches the plan, then the conclusion.

The conclusion is tentative; the arithmetic underneath it is not.

26 likes 26d
DN
d.ndiayeTL23 Jul 2026#95
b.vanhecke, post #53: Author track record is a weak signal and it is a signal. A group that has published carefully for years is a different prior from an unknown one. Go to post

Where I part company with post #94, and it is a narrow parting.

Author track record is a weak signal and it is a signal. A group that has published carefully for years is a different prior from an unknown one.

12 likes in reply to #53 25d
LA
l.aaltonenTL3Regular4 Jul 2026#96

Post #94 is the version of this I will quote in future. One addition.

Sample size and pre-registration are checkable in a preprint exactly as in a paper, and they carry the same weight.

I would treat the number as indicative rather than as a measurement.

4 likes 24d
CV
ca.vermeulenTL25 Jul 2026#97
HN
h.nicolaidesTL3Regular6 Jul 2026#98

Building anything durable on a preprint means committing to rebuild it. That is a reasonable trade for a fast-moving question and it should be an explicit one.

0 likes 22d
IG
in.guerreroTL27 Jul 2026#99

I read post #98 twice before replying, because I had assumed the opposite.

Where numbers change between preprint and published version, the changes are not random. They tend toward a smaller effect and a more carefully hedged claim.

I have changed my mind on this once already, so take it as current rather than settled.

2 likes 21d
EL
endpoint_lineTL3Regular8 Jul 2026#100
h.ferrari, post #44: Peer review catches some things reliably — missing methods, unsupported conclusions, statistical mistakes of the obvious kind — and misses others routinely. Knowing which is which makes preprint reading easier. On reflection I would soften that slightly. Go to post

What changes between preprint and publication: authors respond to reviewer comments, re-analyse data, correct errors found in peer review, and sometimes report different results from updated analyses. The published version is not the same as the preprint.

That has been true for the cases I have seen and I have not seen many.

0 likes in reply to #44 20d
SH
s.hartmannTL29 Jul 2026#101

Where a preprint contradicts a published trial, the prior should favour the trial. Where it extends one, the preprint can be genuinely useful.

0 likes 19d
MW
m.wanjalaTL1Member10 Jul 2026#102

A preprint that has been up for two years without appearing in a journal is telling you something, and it is not necessarily that the work is bad.

19 likes 18d
KK
k.kimaniTL211 Jul 2026#103
KAndersson, post #86: Where I part company with post #82, and it is a narrow parting. Building anything durable on a preprint means committing to rebuild it. That is a reasonable trade for a fast-moving question and it should be an explicit one. Adding this to the thread rather than to the wiki, because I am not confident enough for the wiki. Go to post

Where I part company with post #101, and it is a narrow parting.

Author track record is a weak signal and it is a signal. A group that has published carefully for years is a different prior from an unknown one.

One more caveat and then I will stop qualifying: the sample selected itself.

8 likes in reply to #86 17d
K
KForsbergTL2Member12 Jul 2026#104
buffer_sheet, post #64: Everything in post #60 holds. The case it does not cover is the one I have. Retractions and corrections do not propagate well from preprint servers. A citation that was fine when made can quietly become wrong. A partial answer, offered because a partial answer beats none. Go to post

Post #101 is the version of this I will quote in future. One addition.

Retractions and corrections do not propagate well from preprint servers. A citation that was fine when made can quietly become wrong.

Take it as a starting point and not as a specification.

2 likes in reply to #64 16d
SR
s.radichTL213 Jul 2026#105

Good question, well framed, and I would like to see it answered properly.

0 likes 14d
W
WoodhouseTL2Member14 Jul 2026 · edited#106

The honest position on most preprints in this field is that they are interesting and provisional, and that saying both is not fence-sitting.

27 likes 13d
ON
o.nybergTL216 Jul 2026#107
s.hartmann, post #101: Where a preprint contradicts a published trial, the prior should favour the trial. Where it extends one, the preprint can be genuinely useful. Go to post

Server repositories: medRxiv for medicine, bioRxiv for biology. Preprints on these servers are time-stamped and have DOIs even if they are later published elsewhere. Citing the preprint with its DOI is appropriate while noting it is unpublished.

That is the shape of it. The detail is where I would expect to be corrected.

13 likes in reply to #101 12d
M
MakinenTL2Member17 Jul 2026#108

Building on post #106 rather than restating it.

Where a preprint's numbers are the basis of a claim being repeated here, someone should check whether the published version exists yet. That check is nearly always overdue.

I keep a log of this specifically because memory is unreliable about it.

4 likes 11d
BA
b.aaltoTL218 Jul 2026#109

Worth separating two things that post #106 runs together.

Author track record is a weak signal and it is a signal. A group that has published carefully for years is a different prior from an unknown one.

That has held every time I have looked, which is not the same as always.

0 likes 10d
EL
e.lehtinenTL219 Jul 2026#110
diluent_watch, post #94: Reading a preprint properly means doing some of the reviewer's job: methods first, then whether the analysis matches the plan, then the conclusion. The conclusion is tentative; the arithmetic underneath it is not. Go to post

This follows post #109 rather than contradicting it.

How to cite a preprint: author last name, first initial, et al. Title. Server name [preprint]. Posted date. Doi. Include the server name and note that it is a preprint.

I would call that likely rather than established.

0 likes in reply to #94 9d
BT
baseline_tableTL2Member20 Jul 2026#111
r.danquah, post #46: Where a preprint's numbers are the basis of a claim being repeated here, someone should check whether the published version exists yet. That check is nearly always overdue. Small point, but it is the one that usually catches people. Go to post

Screening on a preprint server is minimal and is not review. It filters obvious problems and nothing more, which is what it is designed to do.

0 likes in reply to #46 8d
TB
t.brandtTL221 Jul 2026#112

Always label it as a preprint in any discussion. A preprint is not a published trial and it is not settled knowledge. Use it for hypothesis generation and for understanding emerging evidence, not for drawing definitive conclusions.

2 likes 7d
D
DSakamotoTL3Regular22 Jul 2026#113

Building on post #112 rather than restating it.

Do not build anything on a preprint that you would mind rebuilding: if the preprint later changes substantially in revision or shows different results when published, your reasoning based on the preprint needs to be revised.

One of those cases where knowing the mechanism does not help the decision.

9 likes 6d
EK
ew.kuuselaTL223 Jul 2026#114

Version numbers on a preprint server matter. Citing version one of something now on version four is citing a document that has been superseded by its own authors.

Caveat: everything above assumes the paperwork is what it says it is.

21 likes 5d
CW
cohort_watchTL2Member24 Jul 2026#115
j.nwosu, post #60: Post #57 is right about the mechanism and I think understates the practical bit. Building anything durable on a preprint means committing to rebuild it. That is a reasonable trade for a fast-moving question and it should be an explicit one. Go to post

The honest position on most preprints in this field is that they are interesting and provisional, and that saying both is not fence-sitting.

Noting that the question and the thing people usually mean by it are different.

0 likes in reply to #60 4d
FL
f.laurentTL225 Jul 2026#116

Check whether it was later published: searching for the preprint's first author and keywords in PubMed might find a published version. The published version is the stronger citation if it exists.

5 likes 3d
KB
k.bettencourtTL2Member26 Jul 2026#117

Thank you for taking the time. That was more work than a reply usually is.

14 likes 2d

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