Kristoffer Magnusson
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rpsychologist.com
Kristoffer Magnusson
@rpsychologist.com
Mostly stats, visualization, open science, and psychotherapy.

https://rpsychologist.com
Fun fact about LMMs: when you have missing data, power also depends on the correlation between intercepts and slopes. In the clip, I’m varying the amount of random slope variance.
November 10, 2025 at 2:57 PM
A
November 7, 2025 at 6:09 PM
Try it out and let me know what you think, it is still a bit experimental
November 7, 2025 at 4:58 PM
Dammit 😅
October 29, 2025 at 8:28 AM
Let's make it happen. I'm ok with doing whatever I want for 1 week
October 29, 2025 at 8:05 AM
Sign me up 🫡
October 28, 2025 at 5:10 PM
v3 will recruit the participants for you
October 28, 2025 at 5:05 PM
Thanks 🙏
October 28, 2025 at 5:04 PM
GitHub version is still functional (dev branch)
October 28, 2025 at 2:51 PM
No immediate plans to re-submit to CRAN, but open to collaborations/co‑maintainers.
October 28, 2025 at 2:38 PM
Plus:
- New welcome screen
- Guided help tour
- View correlation matrix as a heat map
- and other UI improvements

October 28, 2025 at 2:02 PM
Calculations have been validated against R.

Validation notes: github.com/rpsychologis...
October 28, 2025 at 2:02 PM
Share your analysis as a URL, or store it as a JSON file.

For example:

powerlmmjs.rpsychologist.com?n1=13&time_e...
October 28, 2025 at 2:02 PM
Power analysis summary report, that can be printed or saved as a PDF
October 28, 2025 at 2:02 PM
Hypothesis region visualization. Interactive display of the chosen null and alternative hypothesis.
October 28, 2025 at 2:02 PM
Sips is always great, I'm hosting my own sessions
June 26, 2025 at 6:53 AM
Mycket intressant bok, får bli sommarläsning!
June 17, 2025 at 3:57 PM
consult the hexaflex
June 12, 2025 at 1:20 PM
yeah, it was basically those circles. but they were pretty big even here (or loud)
June 12, 2025 at 11:44 AM