Doctoral Researcher at the Autism, Social Cognition & Bodily Movement Lab (jencooklab.com), Senior Centre Technician at @TheCHBH, MATLAB Ambassador, He/Him.
Joined March 2009
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š New paper alert! š§ The velocity-curvature power law is one of the 'kinematic laws of nature' (Flash 2021), a 'fundamental law of human control' (Zago et al. 2016), and one of the 'kinematic regularities' (Frith & Frith 2023) thought to underlie all biological motion. 1/9
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Follow-up to my ICC thread from last week š§µ I wanted to test Salarian's MATLAB FileExchange code. Thanks to @cchapman.bsky.social for pointing me toward R. I took it further than perhaps intended.
New experience today š: I set up an experiment to check the testāretest stability of my favourite kinematic measure: Lacquanitiās 1/3 power law. A velocityācurvature relationship that results in a kinematic invariance which might underlie all biological motion.
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Slight overhead of launching R every time you do that Rscript system call!
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You can even add the necessary packages without ever looking at R
system('Rscript -e "install.packages(''psych'', repos=''cran.r-project.org'')"')
system('Rscript -e "install.packages(''ICC'', repos=''cran.r-project.org'')"')
#MATLAB #MATLABambassador #R
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Dagmar Fraser @dagmarfraser.bsky.social retweeted
What is social cognition? Watch my interview with Drs. Uta Frith (@utafrith) and Chris Frith about their book, āWhat Makes Us Social?ā #Psychology #Science
youtu.be/1I2LvEFKhe8
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New experience today š: I set up an experiment to check the testāretest stability of my favourite kinematic measure: Lacquanitiās 1/3 power law. A velocityācurvature relationship that results in a kinematic invariance which might underlie all biological motion.
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Butā¦ last updated in 2016. How far do we trust ārandomā code? š¤ I will havw to write some tests. This is the reality of (apparently!) niche stats in MATLAB, community-driven, not MathWorks-authored. Who do I have to bribe to get it added?
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So hereās the question: whatās your ICC workflow? There must be dozens of us! Dozens!
MATLAB, R, Pythonā¦ or do you still cling to SPSS? š§
#MATLAB #MATLABambassador
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š§µ Back in 1999, I was hand-rolling the Karhunen-LoĆØve transform using eig() ā¦ you may know it as Principal Component Analysis, or as the cool kids now know it by its rapper name PCA. š¤
I had no fancy toolboxes with the pca() command.
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š It lets you: ā¢ Manipulate Ī¼ and Ļ of up to 3 variables ā¢ Adjust correlations ā¢ Watch Principal Components (PCs) emerge in real-time ā”You can rotate 3D plots š, click individual points to see their deviation vectors animated, and visualize projections onto each PC.
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Available on MATLAB Onlineā just click that Launch button on GitHub. š You donāt even need a license - 20hrs/month free!
#MATLAB #PCA #KarhunenLoeve #MATLABambassador
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