Alex Coppock
aecoppock.bsky.social
Alex Coppock
@aecoppock.bsky.social
Associate Professor of Political Science at Northwestern University
alexandercoppock.com
Persuasion in Parallel: https://alexandercoppock.com/coppock_2022.html
Research Design: Declaration, Diagnosis, and Redesign: book.declaredesign.org
Thank you! Link fixed and page updated!
January 11, 2026 at 9:04 PM
Do we have any information about the study design? The publicly available deactivation RCTs I've seen do also show that deactivation improves well-being, e.g.

www.nber.org/papers/w33697
January 7, 2026 at 5:30 PM
They might read this one: psycnet.apa.org/doiLanding?d...

I think we have a duty to teach students that we now know that "how the field has thought" about mediation leads to theoretically convenient answers that are prone to bias.

Now we have to 'unlearn' those answers and reject that procedure.
APA PsycNet
psycnet.apa.org
December 22, 2025 at 7:14 PM
Thanks for responding; not sure if that reg. is right.
how about comparing:
1D v 1S
(1D + 1D) v (1D + 1S)
(1S + 1D) v (1S + 1S)
(2D + 1D) v (2D + 1S)
(2S + 1D) v (2S + 1S)
etc
This analysis would deal with @adamzelizer.bsky.social's good points about "bad control" and that there's just 1 effect
December 18, 2025 at 8:23 PM
If that's the design,

(2 Daughters) compared to (2 Daughters + 1 son),

it's not relying on the as-if random assignment of child sex, right?

There's obviously plenty of selection into a third child.

can we compare

(2 Daughters + 1 son) v (2 Daughters + 1 Daughter)

instead?
December 18, 2025 at 6:52 PM
seriously hit refresh like what is happening to my browser
December 15, 2025 at 8:39 PM
so well put. I esp. agree with turning off the damn in-line AI and copy-pasting like a sketchy SO answer. I like also how you talk about why the AI for advanced users is different from the AI for beginners
December 9, 2025 at 8:44 PM
what do you think your modal referee comment is in those 47 (!) reports in 2025?
December 9, 2025 at 5:34 PM
Absolutely, I often use reanalysis to estimate estimands that the original experimenters didn't consider (a different outcome, a different subset of subjects). In the probit / OLS example, I'm imagining that we're both after the same estimand (the ATE).

Definitions are hard, thanks for engaging!
December 3, 2025 at 8:56 PM
Here's a common one in my work:

Someone analyses their experiment with a probit regression. That's fine, but I prefer OLS; I reanalyze the data because I want the OLS estimate, not because I want to assess the "robustness" of the probit estimate.

(This is often on the way to meta-analysis)
December 3, 2025 at 8:47 PM
yes Matt, this is my view too. At least there's an estimand! Maybe you don't care about the value of that estimand (i.e., I think Cyrus cares most about estimands that inform policy decisions).
December 3, 2025 at 8:32 PM
I agree with you that survey exps (lists, conjoints, etc) are often used for descriptive, not causal, inference (we write about it here: book.declaredesign.org/library/expe...). Also useful.

There's no need, though, to write survey experiments for causal inference out of the "revolution."
17  Experimental : descriptive – Research Design in the Social Sciences
book.declaredesign.org
December 3, 2025 at 8:05 PM
I especially like your definitions for replication and reproduction.

One word I use that's not here is "reanalysis." I think some of its meaning is covered by "robustness testing" but sometimes (usually?) my reanalysis isn't about the "robustness" of the original.

thoughts on "reanalysis"?
December 3, 2025 at 7:58 PM
That's great to hear! Congrats on an amazing paper
December 2, 2025 at 8:01 PM
Should have read the actual paper first! Thanks for your engagement on the viz side; v. interesting example here.
December 1, 2025 at 7:29 PM
I was surprised @ 90% cis and the "predicted" values" in the viz and prefer your viz (95%CIs and the raw data) for sure.

I'll say that the viz is ironically v. useful in this case because it raises a tension between the picture and the design (wait, I thought the outcome was binary???)
December 1, 2025 at 7:17 PM
Also, friends, reviewers, editors -- please be willing to publish experimental estimates of the effects of anti-corruption messages on vote choice even if the "theory isn't novel" or "so and so already published on the effects of anti-corruption."

This is an impt. estimand; we need many estimates!
November 20, 2025 at 8:21 PM