Don’t calculate post-hoc power using observed estimate of effect size | Statistical Modeling, Causal Inference, and Social Science

#statstab #477 Don’t calculate post-hoc power using observed estimate of effect size

Thoughts: Good discussion and many useful references. Even big journals print stupid stuff.

#posthoc #power #sensitivity #samplesize #consort #medicine #bias

statmodeling.stat.columbia.edu/2018/09/24/d...

The Trouble with Facts One Motor Vehicle What we call facts are not discoveries of an unfiltered world. They are the end-products of mediation. Let’s walk through an example. Image: Autosmash example. An observer arrives…

The trouble with facts is that they cannot be directly observed.
philosophics.blog/2026/01/22/t...
#philosophy #epistemology #ontology #facts #objectivity #mediation #interpretation #causation #abduction #posthoc #cognitivebias #perception #philosophyoflaw #intent #blog #podcast #science

Generation‑Time vs Post‑hoc Citation: Evaluating LLM Attribution Strategies

A study finds post‑hoc citation (P‑Cite) offers broader coverage, while G‑Cite yields higher correctness; retrieval quality drives performance and G‑Cite has higher latency. getnews.me/generation-time-vs-post-... #llmcitation #posthoc

#quotes #books #booksky #excerpts #citations #heavenandhell #ehrman #messiah #suffer #death #christianity #earlychristianity #christians #jesus #christ #crucifixion #posthoc #religion #belief #myth #legend #badhypothesis

The Abuse of Power It is well known that statistical power calculations can be valuable in planning an experiment. There is also a large literature advocating that power calculations be made whenever one performs a s...

#statstab #353 The Abuse of Power; The Pervasive Fallacy of Power Calculations for Data Analysis

Thoughts: An seminal paper on "post hoc" power calculations.

#power #QRPs #NHST #posthoc #samplesize #effectsize

www.tandfonline.com/doi/abs/10.1...

Post hoc ergo propter hoc – Wikipedia

Wort des Tages: Der #PostHoc - Fehlschluss ("Post hoc ergo propter hoc"). Die lateinische Phrase "danach, also deswegen" bezeichnet eine falsche Annahme von Ursache und Wirkung.

Beispiel: "Ich habe einen Regenschirm mitgenommen, doch dann kam die Sonne raus. Also bringen Regenschirme gutes Wetter!"

Encourage Playing with Data and Discourage Questionable Reporting Practices - Psychometrika Psychometrika -

#statstab #330 Encourage Playing with Data and Discourage Questionable Reporting Practices

Thoughts: What are and aren't "Questionable Research Practices"? Where is the "grey area"? Interesting opinion piece.

#QRPs #exploratory #EDA #posthoc #phacking

link.springer.com/article/10.1...

"MS13" is obviously doctored. They didn't even bother to match the color/resolution of the original tattoo. Why is "S" off-center? And JPEG artifacts indicate Photoshop. Either way, ambiguous symbols aren't MS-13's style! This man lies in ALL FORMATS AND FORMS! #AbregoGarcia #PostHoc

semPower: Power Analysis for Structural Equation Models

Here’s another #rstats #shinyapp that provides #a-priori #posthoc and #compromise #SEM #power and #sample #size estimation by Moshagen and Bader (2024) link.springer.com/article/10.3... sempower.shinyapps.io/sempower/

This headline does make the 2012 Olympics sound like it is the cause of the drop in PE teachers. #PostHoc

Sage Journals: Discover world-class research Subscription and open access journals from Sage, the world's leading independent academic publisher.

Tutorial paper illustrating how to develop planned contrasts (as an alternative to #PostHoc comparisons) in #Rstats, including empirical examples with reproducible data:
journals.sagepub.com/doi/full/10....

#StudyDesign #RCT

Post Hoc Power: Not Empowering, Just Misleading

#statstab #189 Post Hoc Power: Not Empowering, Just Misleading

Thoughts: "the observed power is a 1:1 function of the P value" If you need a ref for why "post hoc" power is nonsense (paywalled).

#power #posthoc #QRPs #errorcontrol #poweranalysis

www.sciencedirect.com/science/arti...

Post hoc $\chi^2$ test with R This is a quite simple question but I don't find any good, clear, precise answers: I'm looking for a way to perform post hoc test on a chi$^2$ test. I have 2 variables : var1 : good/fair/poor and ...

#statstab #176 Pairwise test after a (omnibus) χ2 test of equality of proportions w/ R

Thoughts: I've often had this complaint with many packages where all they offer is the overall dif, not per two cells.

#chi2 #posthoc #r #rstats

stats.stackexchange.com/questions/11...

#statstab #162 Post-hoc Contrasts by {rcompanion}

Thoughts: A good tutorial should always be shared. This goes step-by-step and provides options. Including plots.

#stats #emmeans #posthoc #ttest #nhst #r #dataviz #models

rcompanion.org/rcompanion/h...

How are the degrees of freedom in the emmeans package calculated? - R Let us look at some sample data for 5 hypothetical subjects. library(emmeans) library(lme4) # generate some sample data # condition (Placebo, Treatment) # type (some factor, e.g. two different

#statstab #71 {emmeans} contrasts are not (always) like t-tests

Thoughts: t-tests use parts of your data, emmeans use your fitted model (inc. dfs). (g-computation is even more confusing). Important to know what these all do.

#stats #posthoc #nhst

stats.stackexchange.com/questions/36...