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Kristoffer Magnusson

@rpsychologist.com

1.3K followers 1.4K following 110 posts

Mostly stats, visualization, open science, and psychotherapy. https://rpsychologist.com

rpsychologist.com

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Kristoffer Magnusson @rpsychologist.com · Dec 11

Introducing PowerLMM.js!

A new tool for power analysis of longitudinal linear mixed-effects models (LMMs) – with support for missing data, plus non-inferiority and equivalence tests.

powerlmmjs.rpsychologist.com

Would really appreciate your feedback as I refine this app! Details below 🧵👇

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Kristoffer Magnusson @rpsychologist.com · Jun 26

Sips is always great, I'm hosting my own sessions

Kristoffer Magnusson @rpsychologist.com · Jun 17

Mycket intressant bok, får bli sommarläsning!

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Kristoffer Magnusson @rpsychologist.com · Jun 12

consult the hexaflex

Kristoffer Magnusson @rpsychologist.com · Jun 12

yeah, it was basically those circles. but they were pretty big even here (or loud)

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Kristoffer Magnusson @rpsychologist.com · Jun 12

everywhere 😅 books, mailing lists, papers, conferences, courses, lunch rooms, pubs

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Kristoffer Magnusson @rpsychologist.com · Jun 12

I’d completely forgotten about RFT. Brings back memories

Kristoffer Magnusson @rpsychologist.com · Jun 6

a man is standing in front of a chalkboard with math equations on it .

ALT: a man is standing in front of a chalkboard with math equations on it .

media.tenor.com

Kristoffer Magnusson @rpsychologist.com · Jun 6

Turns out proportions aren't collapsible after all. Take that, OR haters.

"Globally, approximately 3.3% of the population reports using AAS, with prevalence rates of 6.4% among men [2] and 4% among women [3]."

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Kristoffer Magnusson @rpsychologist.com · Jun 5

Daniel Kardefelt-Winther presenting new analyses that covers nearly 39,000 children from 39 countries

www.youtube.com/live/XKo6oUY...

Spoiler alert: Screen time alone was weakly and inconsistently associated with mental health indicators

Digital media and its impact on children and adolescents – livestreamed Nordic and EU expert meeting

YouTube video by Folkhälsomyndigheten

www.youtube.com

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Kristoffer Magnusson @rpsychologist.com · Jun 5

I watched this so you don’t have to. A couple of highlights:

”I sometimes say that 'screen use', when putting that into statistical models, it’s sort of like looking at 'car use' when trying to find out why injuries are happening from car accidents” 🇳🇴
www.youtube.com/live/XKo6oUY...

Digital media and its impact on children and adolescents – livestreamed Nordic and EU expert meeting

YouTube video by Folkhälsomyndigheten

www.youtube.com

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Kristoffer Magnusson @rpsychologist.com · Jun 5

Cut out the middle man, use unbound as your upstream DNS resolver

Kristoffer Magnusson @rpsychologist.com · May 28

i ain't reading all that

i'm happy to use the odds ratio tho

or sorry that i happened to use it

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Kristoffer Magnusson @rpsychologist.com · May 26

"The authors are the ones that are familiar with the data, that are experts ... they’re the ones that should be convincing us. They should be using all these extra methods like bias analyses and inputting their expert knowledge to convince us that the real answer is somewhere in this range"

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Kristoffer Magnusson @rpsychologist.com · May 26

Great talk by @jeremylabrecque.bsky.social

"Before and after causal inference: recognizing causal questions and answering them when assumptions are violated"

www.youtube.com/watch?v=9B-X...

2025 CAUSALab Methods Series with Jeremy Labrecque

YouTube video by CAUSALab at Harvard T.H. Chan

www.youtube.com

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Kristoffer Magnusson @rpsychologist.com · May 23

Looking forward to the authors' thoughtful response

a close up of a person pressing a hyperx key

ALT: a close up of a person pressing a hyperx key

media.tenor.com

Kristoffer Magnusson @rpsychologist.com · May 23

re b) the option to request an "advisory opinion" is basically there to meet journal policies, even though the application is technically rejected

Kristoffer Magnusson @rpsychologist.com · May 23

It depends, ethical review would be required if the study is "carried out with a method that aims to affect the research participant physically or mentally, or involves an obvious risk of harm to them in body or mind"

Kristoffer Magnusson @rpsychologist.com · May 23

I'm sure there is a SEM model for this

Kristoffer Magnusson @rpsychologist.com · May 23

Yeah, I guess that’s right. I meant to reply to Matti's comment

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Kristoffer Magnusson @rpsychologist.com · May 23

Big brain move. No need for p-hacking or faking data

Kristoffer Magnusson @rpsychologist.com · May 23

Sweden doesn’t require ethical review either, as long as participants are anonymous. If you apply for ethics for these types of studies it will be rejected (although you have the option to request an "advisory opinion")

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Kristoffer Magnusson @rpsychologist.com · May 23

Honestly, with how fuzzy these construcs are I wouldn’t be surprised if there's no association

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Kristoffer Magnusson @rpsychologist.com · May 23

Not sure where to start with this one. Internet gaming addiction… is a risk factor for internet gaming disorder

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Kristoffer Magnusson @rpsychologist.com · May 19

If gambling is the blueprint, we can expect that the definition of "gaming" won’t come from scientists but from lawyers

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