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If you have two measures of the same confounder, you can just include both of them in your regression model

October 13, 2025 Julia Rohrer 3 Comments

Corrigendum: There was an embarrassing mistake in the SEM part of the original version of this blog post which has…

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Posted in: Causal inference, Measurement, Statistics, Teaching

What’s in a correlation?

July 28, 2025 Julia Rohrer 2 Comments

Correlation may not imply causation, but let’s just ignore that for a second. Correlations are standardized effect size metrics and…

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Posted in: Metrics, Statistics, Teaching
Iceberg with text superimposed, from top to bottom: (1) Yes, you probably do want those random intercepts (2) Time-varying confounding (3) The "correct" time lag (4) It's only prediction! Why you heff to be mad.

Reviewer notes: So you’re interested in “lagged effects.”

June 25, 2025 Julia Rohrer Leave a comment

In some fields, researchers who end up with time series of two variables of interest (X and Y) like to…

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Posted in: Causal inference, Reviewer notes, Statistics

Reviewer notes: That’s a very nice mediation analysis you have there. It would be a shame if something happened to it.

March 20, 2025 Julia Rohrer 15 Comments

Mediation analysis has gotten a lot of flak, including classic titles such as “Yes, but what’s the mechanism? (Don’t expect…

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Posted in: Causal inference, Statistics, Teaching

Controlling for careless responding requires causal justification

February 18, 2025 Taym Alsalti Leave a comment

Guest post by Taym Alsalti. If you want a citable version, see this preprint with Jamie Cummins & Ruben Arslan.…

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Posted in: Uncategorized
Inspirational quote: A goal is not always meant to be reached, it often serves simply as something to aim at. Bruce Lee (or maybe somebody else)

Reviewer notes: Avoid any ambiguity about analysis aims

February 17, 2025 Julia Rohrer Leave a comment

For any central statistical analysis that you report in your manuscript, it should be absolutely clear for readers why the…

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Posted in: Causal inference, Reviewer notes, Teaching Filed under: peer review

Reviewer notes: In a randomized experiment, the pre-post differences are not effect estimates

January 22, 2025 Julia Rohrer 4 Comments

Reviewer notes are a new short format with brief explanations of basic ideas that might come in handy during (for…

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Posted in: Causal inference, Reviewer notes, Statistics, Teaching

The Untold Mystery of Rogue RA

December 18, 2024 Malte Elson 1 Comment

The 100% CI unravels serial cases of mysterious research misconduct by a single villain: Rogue RA

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Posted in: Shitposting
Funny Bunny/Lotti Karotti

The Hare-Brained Generation: Teen mental health crisis or lacklustre record keeping?

December 10, 2024 Ruben Arslan Leave a comment

In The Anxious Generation, Jon Haidt argues that social media is driving a mental health crisis among teens. It’s a…

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Posted in: Causal inference, Error culture, Measurement Filed under: error culture, mistakes, peer review, social media
Sampling distribution of the mean with an observed mean and the resulting confidence interval indicated by a shruggie emoji

Why you are not allowed to say that your 95% confidence interval contains the true parameter with a probability of 95%

December 5, 2024 Julia Rohrer 7 Comments

A shibboleth is a custom, such as a choice of phrasing, that distinguishes one group of people from another. The…

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Posted in: Statistics, Teaching

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  • If you have two measures of the same confounder, you can just include both of them in your regression model
  • What’s in a correlation?
  • Reviewer notes: So you’re interested in “lagged effects.”
  • Reviewer notes: That’s a very nice mediation analysis you have there. It would be a shame if something happened to it.
  • Controlling for careless responding requires causal justification

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