Looking forward to delivering a lecture today on effect sizes and power analysis for a second-year research methods course. God bless Kristoffer Magnusson for his web apps rpsychologist.com/cohend/ 🙏
October 9, 2024 at 7:44 AM
Looking forward to delivering a lecture today on effect sizes and power analysis for a second-year research methods course. God bless Kristoffer Magnusson for his web apps rpsychologist.com/cohend/ 🙏
#statstab #396 If researchers find Cohen’s d = 8, no they didn’t
Thoughts: Sometimes an effect is so impressive that its unbelievable.
#effectsize #cohend #QRPs #sesoi
mmmdata.io/posts/2025/0...
Thoughts: Sometimes an effect is so impressive that its unbelievable.
#effectsize #cohend #QRPs #sesoi
mmmdata.io/posts/2025/0...
July 28, 2025 at 7:47 PM
#statstab #396 If researchers find Cohen’s d = 8, no they didn’t
Thoughts: Sometimes an effect is so impressive that its unbelievable.
#effectsize #cohend #QRPs #sesoi
mmmdata.io/posts/2025/0...
Thoughts: Sometimes an effect is so impressive that its unbelievable.
#effectsize #cohend #QRPs #sesoi
mmmdata.io/posts/2025/0...
What would Cohen's d be for novel popout? Excellent question. Maybe something like 3.70...?
Using this excellent tool...
rpsychologist.com/cohend/?CER=...
Using this excellent tool...
rpsychologist.com/cohend/?CER=...
October 23, 2023 at 8:30 PM
What would Cohen's d be for novel popout? Excellent question. Maybe something like 3.70...?
Using this excellent tool...
rpsychologist.com/cohend/?CER=...
Using this excellent tool...
rpsychologist.com/cohend/?CER=...
I am routinely puzzled about implicit assumptions in the neuromodulation literature. If you use between-subjects designs with ~10-12 people per condition, you essentially assume that your desired effect has a d>1.2.
Which effects are even in this ballpark? #neuroscience #PsySciSky
Which effects are even in this ballpark? #neuroscience #PsySciSky
November 6, 2023 at 12:15 PM
I am routinely puzzled about implicit assumptions in the neuromodulation literature. If you use between-subjects designs with ~10-12 people per condition, you essentially assume that your desired effect has a d>1.2.
Which effects are even in this ballpark? #neuroscience #PsySciSky
Which effects are even in this ballpark? #neuroscience #PsySciSky
#statstab #479 Uncertainty limits the use of power analysis
Thoughts: Frequentists avoiding uncertainty is never good.
#poweranalysis #error #uncertainty #simulation #cohend #effectsize
www.researchgate.net/publication/...
Thoughts: Frequentists avoiding uncertainty is never good.
#poweranalysis #error #uncertainty #simulation #cohend #effectsize
www.researchgate.net/publication/...
(PDF) Uncertainty Limits the Use of Power Analysis
PDF | The calculation of statistical power has been taken up as a simple yet informative tool to assist in designing an experiment, particularly in... | Find, read and cite all the research you need o...
www.researchgate.net
December 11, 2025 at 3:55 PM
#statstab #479 Uncertainty limits the use of power analysis
Thoughts: Frequentists avoiding uncertainty is never good.
#poweranalysis #error #uncertainty #simulation #cohend #effectsize
www.researchgate.net/publication/...
Thoughts: Frequentists avoiding uncertainty is never good.
#poweranalysis #error #uncertainty #simulation #cohend #effectsize
www.researchgate.net/publication/...
Steve Schmidt: Michael Cohen's lies EXPOSED
YouTube video by The Warning with Steve Schmidt
youtu.be
January 18, 2026 at 3:43 PM
#statstab #153 Difference between Cohen's d and beta coefficient in a standardized regression
Thoughts: This relationship bw (beta) and (d) may be useful in some reporting edge cases, like #metaanalysis
#cohend #regression #effectsize
stats.stackexchange.com/questions/47...
Thoughts: This relationship bw (beta) and (d) may be useful in some reporting edge cases, like #metaanalysis
#cohend #regression #effectsize
stats.stackexchange.com/questions/47...
August 7, 2024 at 4:18 PM
#statstab #153 Difference between Cohen's d and beta coefficient in a standardized regression
Thoughts: This relationship bw (beta) and (d) may be useful in some reporting edge cases, like #metaanalysis
#cohend #regression #effectsize
stats.stackexchange.com/questions/47...
Thoughts: This relationship bw (beta) and (d) may be useful in some reporting edge cases, like #metaanalysis
#cohend #regression #effectsize
stats.stackexchange.com/questions/47...
#statstab #531 Effect Size Calculator [Campbell]
Thoughts: A nice place for quick formulas for variance and effect sizes of various designs and data types.
#metaanalysis #effectsize #CohenD #calculator #Variance #Eta #effects
www.campbellcollaboration.org/calculator/e...
Thoughts: A nice place for quick formulas for variance and effect sizes of various designs and data types.
#metaanalysis #effectsize #CohenD #calculator #Variance #Eta #effects
www.campbellcollaboration.org/calculator/e...
Effect Size Calculator – Campbell Collaboration
www.campbellcollaboration.org
May 13, 2026 at 7:42 PM
#statstab #531 Effect Size Calculator [Campbell]
Thoughts: A nice place for quick formulas for variance and effect sizes of various designs and data types.
#metaanalysis #effectsize #CohenD #calculator #Variance #Eta #effects
www.campbellcollaboration.org/calculator/e...
Thoughts: A nice place for quick formulas for variance and effect sizes of various designs and data types.
#metaanalysis #effectsize #CohenD #calculator #Variance #Eta #effects
www.campbellcollaboration.org/calculator/e...
#statstab #402 On Bayes factors for hypothesis tests {emBayes Factor}
Thoughts: On bsky there were renewed debates about BFs. This paper provides "better" priors (mixture t centred on the ES). Also some p-value BFs
#bayesian #bayesfactor #priors #cohend
link.springer.com/article/10.3...
Thoughts: On bsky there were renewed debates about BFs. This paper provides "better" priors (mixture t centred on the ES). Also some p-value BFs
#bayesian #bayesfactor #priors #cohend
link.springer.com/article/10.3...
On Bayes factors for hypothesis tests - Psychonomic Bulletin & Review
We develop alternative families of Bayes factors for use in hypothesis tests as alternatives to the popular default Bayes factors. The alternative Bayes factors are derived for the statistical analyse...
link.springer.com
August 19, 2025 at 7:18 PM
#statstab #402 On Bayes factors for hypothesis tests {emBayes Factor}
Thoughts: On bsky there were renewed debates about BFs. This paper provides "better" priors (mixture t centred on the ES). Also some p-value BFs
#bayesian #bayesfactor #priors #cohend
link.springer.com/article/10.3...
Thoughts: On bsky there were renewed debates about BFs. This paper provides "better" priors (mixture t centred on the ES). Also some p-value BFs
#bayesian #bayesfactor #priors #cohend
link.springer.com/article/10.3...
#statstab #364 Distribution of Cohen's d, p-values, and power curves for an independent two-tailed t-test
Thoughts: Useful for explaining why we use 5% alpha and what power does to p-values.
#shiny #education #pvalue #power #simulation #ttest #cohend
shinyapps.org/showapp.php?...
Thoughts: Useful for explaining why we use 5% alpha and what power does to p-values.
#shiny #education #pvalue #power #simulation #ttest #cohend
shinyapps.org/showapp.php?...
Experience Statistics
shinyapps.org
June 12, 2025 at 1:16 PM
#statstab #364 Distribution of Cohen's d, p-values, and power curves for an independent two-tailed t-test
Thoughts: Useful for explaining why we use 5% alpha and what power does to p-values.
#shiny #education #pvalue #power #simulation #ttest #cohend
shinyapps.org/showapp.php?...
Thoughts: Useful for explaining why we use 5% alpha and what power does to p-values.
#shiny #education #pvalue #power #simulation #ttest #cohend
shinyapps.org/showapp.php?...
#statstab #615 Evaluating Effect Size in Psychological Research: Sense and Nonsense
Thoughts: It's a bit baffling that ppl just use some random value for their research.
#effectsize #cohend #sesoi #design #theory
journals.sagepub.com/doi/10.1177/...
Thoughts: It's a bit baffling that ppl just use some random value for their research.
#effectsize #cohend #sesoi #design #theory
journals.sagepub.com/doi/10.1177/...
Sage Journals: Discover world-class research
Subscription and open access journals from Sage, the world's leading independent academic publisher.
journals.sagepub.com
September 11, 2026 at 4:24 PM
#statstab #615 Evaluating Effect Size in Psychological Research: Sense and Nonsense
Thoughts: It's a bit baffling that ppl just use some random value for their research.
#effectsize #cohend #sesoi #design #theory
journals.sagepub.com/doi/10.1177/...
Thoughts: It's a bit baffling that ppl just use some random value for their research.
#effectsize #cohend #sesoi #design #theory
journals.sagepub.com/doi/10.1177/...
#statstab #294 So You Think You Can Graph - effectiveness of presenting the magnitude of an effect
Thoughts: Competition in the many ways to display effect magnitude. Some cool ideas.
#dataviz #stats #effectsize #effects #plots #figures #cohend
amplab.colostate.edu/SYTYCG_S1/SY...
Thoughts: Competition in the many ways to display effect magnitude. Some cool ideas.
#dataviz #stats #effectsize #effects #plots #figures #cohend
amplab.colostate.edu/SYTYCG_S1/SY...
So You Think You Can Graph - Season 1
amplab.colostate.edu
March 6, 2025 at 4:26 PM
#statstab #294 So You Think You Can Graph - effectiveness of presenting the magnitude of an effect
Thoughts: Competition in the many ways to display effect magnitude. Some cool ideas.
#dataviz #stats #effectsize #effects #plots #figures #cohend
amplab.colostate.edu/SYTYCG_S1/SY...
Thoughts: Competition in the many ways to display effect magnitude. Some cool ideas.
#dataviz #stats #effectsize #effects #plots #figures #cohend
amplab.colostate.edu/SYTYCG_S1/SY...
#statstab #493 What denominator does the Cohen's d use on JASP??
Thoughts: A thread spanning years, where people figure out the many ways to compute Cohen's d. This stuff needs better labels.
#effectsize #cohend #design #japs #r
forum.cogsci.nl/discussion/3...
Thoughts: A thread spanning years, where people figure out the many ways to compute Cohen's d. This stuff needs better labels.
#effectsize #cohend #design #japs #r
forum.cogsci.nl/discussion/3...
What denominator does the Cohen's d use on JASP??
As I'm getting different results when calculating Cohen's d with SD Pooled as the denominator to the results JASP is giving me.
forum.cogsci.nl
February 25, 2026 at 6:35 PM
#statstab #493 What denominator does the Cohen's d use on JASP??
Thoughts: A thread spanning years, where people figure out the many ways to compute Cohen's d. This stuff needs better labels.
#effectsize #cohend #design #japs #r
forum.cogsci.nl/discussion/3...
Thoughts: A thread spanning years, where people figure out the many ways to compute Cohen's d. This stuff needs better labels.
#effectsize #cohend #design #japs #r
forum.cogsci.nl/discussion/3...
#statstab #260 Effect size measures in a two-independent-samples case with nonnormal and nonhomogeneous data
Thoughts: "A_w and d_r were generally robust to these violations"
#robust #effectsize #ttest #2groups #metaanalysis #assumptions #ttest #cohend
link.springer.com/article/10.3...
Thoughts: "A_w and d_r were generally robust to these violations"
#robust #effectsize #ttest #2groups #metaanalysis #assumptions #ttest #cohend
link.springer.com/article/10.3...
Effect size measures in a two-independent-samples case with nonnormal and nonhomogeneous data - Behavior Research Methods
In psychological science, the “new statistics” refer to the new statistical practices that focus on effect size (ES) evaluation instead of conventional null-hypothesis significance testing (Cumming, P...
link.springer.com
January 17, 2025 at 5:01 PM
#statstab #260 Effect size measures in a two-independent-samples case with nonnormal and nonhomogeneous data
Thoughts: "A_w and d_r were generally robust to these violations"
#robust #effectsize #ttest #2groups #metaanalysis #assumptions #ttest #cohend
link.springer.com/article/10.3...
Thoughts: "A_w and d_r were generally robust to these violations"
#robust #effectsize #ttest #2groups #metaanalysis #assumptions #ttest #cohend
link.springer.com/article/10.3...
Has nothing to do with Biden or Trump.
It's Steve Cohend choice. NYT has really gone to sht
It's Steve Cohend choice. NYT has really gone to sht
December 10, 2024 at 3:33 PM
Has nothing to do with Biden or Trump.
It's Steve Cohend choice. NYT has really gone to sht
It's Steve Cohend choice. NYT has really gone to sht
A cool visualisation for interpreting Cohen's d effect size:
<a href="http://rpsychologist.com/d3/cohend/" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link" target="_blank" rel="noopener" data-link="bsky">http://rpsychologist.com/d3/cohend/ via @krstoffr
-
<a href="http://rpsychologist.com/d3/cohend/" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link" target="_blank" rel="noopener" data-link="bsky">http://rpsychologist.com/d3/cohend/ via @krstoffr
-
Interpreting Cohen's d
A tool to understand Cohen's d standardized effect size
rpsychologist.com
November 13, 2024 at 11:22 PM
A cool visualisation for interpreting Cohen's d effect size:
<a href="http://rpsychologist.com/d3/cohend/" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link" target="_blank" rel="noopener" data-link="bsky">http://rpsychologist.com/d3/cohend/ via @krstoffr
-
<a href="http://rpsychologist.com/d3/cohend/" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link" target="_blank" rel="noopener" data-link="bsky">http://rpsychologist.com/d3/cohend/ via @krstoffr
-
With a Cohen's d of 0.80, 78.8% of the "treatment" group will be above the mean of the "control" group (Cohen's U3), 68.9% of the two groups will overlap, and there is a 71.4%… probability of superiority rpsychologist.com/cohend/
Interpreting Cohen's d
A tool to understand Cohen's d standardized effect size
rpsychologist.com
September 10, 2025 at 2:45 PM
With a Cohen's d of 0.80, 78.8% of the "treatment" group will be above the mean of the "control" group (Cohen's U3), 68.9% of the two groups will overlap, and there is a 71.4%… probability of superiority rpsychologist.com/cohend/
#statstab #512 Standardised mean difference estimators {shinyapp}
Thoughts: Calculating the correct SMD can be challenging, and most software are quite bad at it. Use this shiny app instead!
#cohend #SMD #hedgesg #heterogeneity #effectsize
effectsize.shinyapps.io/deffsize/
Thoughts: Calculating the correct SMD can be challenging, and most software are quite bad at it. Use this shiny app instead!
#cohend #SMD #hedgesg #heterogeneity #effectsize
effectsize.shinyapps.io/deffsize/
effectsize.shinyapps.io
March 24, 2026 at 7:04 PM
#statstab #512 Standardised mean difference estimators {shinyapp}
Thoughts: Calculating the correct SMD can be challenging, and most software are quite bad at it. Use this shiny app instead!
#cohend #SMD #hedgesg #heterogeneity #effectsize
effectsize.shinyapps.io/deffsize/
Thoughts: Calculating the correct SMD can be challenging, and most software are quite bad at it. Use this shiny app instead!
#cohend #SMD #hedgesg #heterogeneity #effectsize
effectsize.shinyapps.io/deffsize/
#statstab #502 Calculate between subjects Cohen's d from frequencies {effectsize}
Thoughts: May come in handy one day, but I'm dubious as to the inference here.
#frequency #cohend #effectsize #rstats #effectsize #shiny #r
errors.shinyapps.io/cohens-d-fro...
Thoughts: May come in handy one day, but I'm dubious as to the inference here.
#frequency #cohend #effectsize #rstats #effectsize #shiny #r
errors.shinyapps.io/cohens-d-fro...
<h1>Calculate between subjects Cohen's d from frequencies</h1>
<h4>Using the {effectsize} package</h4>
errors.shinyapps.io
March 10, 2026 at 8:17 PM
#statstab #502 Calculate between subjects Cohen's d from frequencies {effectsize}
Thoughts: May come in handy one day, but I'm dubious as to the inference here.
#frequency #cohend #effectsize #rstats #effectsize #shiny #r
errors.shinyapps.io/cohens-d-fro...
Thoughts: May come in handy one day, but I'm dubious as to the inference here.
#frequency #cohend #effectsize #rstats #effectsize #shiny #r
errors.shinyapps.io/cohens-d-fro...
#statstab #281 Correcting Cohen’s d for Measurement Error (A Method!)
Thoughts: Scale reliability can be incorporated into effect size computation (i.e., remove attenuation)
#measurementerror #effectsize #cohend #reliability #scales
rpubs.com/JLLJ/RPBD
Thoughts: Scale reliability can be incorporated into effect size computation (i.e., remove attenuation)
#measurementerror #effectsize #cohend #reliability #scales
rpubs.com/JLLJ/RPBD
RPubs - Classical Reliability Correction for Cohen's d and the Point-Biserial
rpubs.com
February 17, 2025 at 11:21 AM
#statstab #281 Correcting Cohen’s d for Measurement Error (A Method!)
Thoughts: Scale reliability can be incorporated into effect size computation (i.e., remove attenuation)
#measurementerror #effectsize #cohend #reliability #scales
rpubs.com/JLLJ/RPBD
Thoughts: Scale reliability can be incorporated into effect size computation (i.e., remove attenuation)
#measurementerror #effectsize #cohend #reliability #scales
rpubs.com/JLLJ/RPBD
#statstab #226 Standardization and other approaches to meta-analyze differences in means
Thoughts: "standardization after meta-analysis...can be used to assess magnitudes of a meta-analyzed mean effect"
#metaanalysis #effectsize #cohend #clinical
onlinelibrary.wiley.com/doi/10.1002/...
Thoughts: "standardization after meta-analysis...can be used to assess magnitudes of a meta-analyzed mean effect"
#metaanalysis #effectsize #cohend #clinical
onlinelibrary.wiley.com/doi/10.1002/...
Standardization and other approaches to meta‐analyze differences in means
Meta-analysts often use standardized mean differences (SMD) to combine mean effects from studies in which the dependent variable has been measured with different instruments or scales. In this tutori...
onlinelibrary.wiley.com
November 18, 2024 at 7:51 PM
#statstab #226 Standardization and other approaches to meta-analyze differences in means
Thoughts: "standardization after meta-analysis...can be used to assess magnitudes of a meta-analyzed mean effect"
#metaanalysis #effectsize #cohend #clinical
onlinelibrary.wiley.com/doi/10.1002/...
Thoughts: "standardization after meta-analysis...can be used to assess magnitudes of a meta-analyzed mean effect"
#metaanalysis #effectsize #cohend #clinical
onlinelibrary.wiley.com/doi/10.1002/...