Scot Morrison
@scotm.bsky.social
MLB Dir Integrative Baseball Performance • Mostly avoids lifes rumble strip • Swipes right for uncertainty • S&C/DPT • currently PhD @ UNIVR exploring measurement theory & predictive modeling.
Interesting thread on measuring SmO2 using NIRS devices and bilateral differences.
@philipskotzke.bsky.social found that across three trials the bias between measurements in the dominant and non-dominant leg vastus lateralis (VL) at the end of a graded cycling test was -2±20% 95% LoA.
Compared to test-retest agreement SEM = ±5-9% within each leg
link.springer.com/article/10.1...
Compared to test-retest agreement SEM = ±5-9% within each leg
link.springer.com/article/10.1...
December 7, 2024 at 10:04 PM
Interesting thread on measuring SmO2 using NIRS devices and bilateral differences.
Isometric torque ≠ strength. Strength mediates recovery if recovery includes restored function & force is a limfac. Dynamometer testing, done well, adds validity evidence to the inference that a patient is adapting towards goals. It’s a proxy that helps us iterate ExRx faster.
December 7, 2024 at 7:24 PM
Isometric torque ≠ strength. Strength mediates recovery if recovery includes restored function & force is a limfac. Dynamometer testing, done well, adds validity evidence to the inference that a patient is adapting towards goals. It’s a proxy that helps us iterate ExRx faster.
Reposted by Scot Morrison
A human bioactuator inspects the entire factory and turns a single screw, fixing the problem. The next day, he bills the company $10,000.
“$10,000? My AI could’ve figured out the problem in an instant!”
The bioactuator relied: “It’s $1 for knowing which screw to turn, and $9,999 for turning it”
“$10,000? My AI could’ve figured out the problem in an instant!”
The bioactuator relied: “It’s $1 for knowing which screw to turn, and $9,999 for turning it”
November 15, 2024 at 1:30 AM
A human bioactuator inspects the entire factory and turns a single screw, fixing the problem. The next day, he bills the company $10,000.
“$10,000? My AI could’ve figured out the problem in an instant!”
The bioactuator relied: “It’s $1 for knowing which screw to turn, and $9,999 for turning it”
“$10,000? My AI could’ve figured out the problem in an instant!”
The bioactuator relied: “It’s $1 for knowing which screw to turn, and $9,999 for turning it”
While we often believe that the number we get from our test represents the construct we care about this is rarely true. Eg. Measuring “strength” as example
November 24, 2024 at 1:57 AM
While we often believe that the number we get from our test represents the construct we care about this is rarely true. Eg. Measuring “strength” as example
One of the best
If you hate statistics like I do, then you'll love my free lectures. Putting science before statistics, 20 lectures from basics of inference & causal modeling to multilevel models & dynamic state space models. It's all free, made with love and sympathy. 🧪 #stats www.youtube.com/playlist?lis...
November 23, 2024 at 12:23 PM
One of the best
Reposted by Scot Morrison
More evidence that "therapists cannot rely on their clinical judgement alone to assess client progress and outcomes and will depend on routine outcome monitoring to detect client deterioration".
Do Therapists Know When Their Clients Deteriorate? An Investigation of Therapists' Ability to Estimate and Predict Client Change During and After Psychotherapy
In routine outcome monitoring, psychotherapists receive feedback from their clients about their self-reported progress during therapy. This practice is based on research indicating that therapists ov....
onlinelibrary.wiley.com
November 23, 2024 at 12:03 PM
More evidence that "therapists cannot rely on their clinical judgement alone to assess client progress and outcomes and will depend on routine outcome monitoring to detect client deterioration".
Reposted by Scot Morrison
Developing a prediction model?
Ever wondered how to target sample size to improve model fairness and precision of risk estimates?
Check out our new pre-print & software package pmstabilityss
arxiv.org/abs/2407.09293
Ever wondered how to target sample size to improve model fairness and precision of risk estimates?
Check out our new pre-print & software package pmstabilityss
arxiv.org/abs/2407.09293
Sample size for developing a prediction model with a binary outcome: targeting precise individual risk estimates to improve clinical decisions and fairness
When developing a clinical prediction model, the sample size of the development dataset is a key consideration. Small sample sizes lead to greater concerns of overfitting, instability, poor performanc...
arxiv.org
November 6, 2024 at 6:27 PM
Developing a prediction model?
Ever wondered how to target sample size to improve model fairness and precision of risk estimates?
Check out our new pre-print & software package pmstabilityss
arxiv.org/abs/2407.09293
Ever wondered how to target sample size to improve model fairness and precision of risk estimates?
Check out our new pre-print & software package pmstabilityss
arxiv.org/abs/2407.09293
Reposted by Scot Morrison
Interested in learning/teaching psychometrics with Rasch Measurement Theory and Item Response Theory? I’ve made CC-BY intro materials (3h lecture) using #rstats and #quartopub with slides here (code repo link on slide 4): pgmj.github.io/RaschIRTlect...
December 6, 2023 at 1:14 PM
Interested in learning/teaching psychometrics with Rasch Measurement Theory and Item Response Theory? I’ve made CC-BY intro materials (3h lecture) using #rstats and #quartopub with slides here (code repo link on slide 4): pgmj.github.io/RaschIRTlect...
Reposted by Scot Morrison
I recently made a comic complaining that NASA refuses to listen to my good ideas for improving the Solar System (xkcd.com/2750).
To my delight, NASA’s Science Mission Directorate has sent me an actual expert panel evaluation of my “flatten the planets” proposal! Sadly, they decided not to fund it.
To my delight, NASA’s Science Mission Directorate has sent me an actual expert panel evaluation of my “flatten the planets” proposal! Sadly, they decided not to fund it.
February 22, 2024 at 2:45 PM
I recently made a comic complaining that NASA refuses to listen to my good ideas for improving the Solar System (xkcd.com/2750).
To my delight, NASA’s Science Mission Directorate has sent me an actual expert panel evaluation of my “flatten the planets” proposal! Sadly, they decided not to fund it.
To my delight, NASA’s Science Mission Directorate has sent me an actual expert panel evaluation of my “flatten the planets” proposal! Sadly, they decided not to fund it.
Reposted by Scot Morrison
STORK (storkinesiology.org) are back with a journal club on Feb 7th!
We will kick off with a discussion of chpt 1 on philosophical concepts in sport and exercise science from the forthcoming STORK book. Available: doi.org/10.51224/SRX...
Register: mcmaster.zoom.us/meeting/regi...
All welcome!
We will kick off with a discussion of chpt 1 on philosophical concepts in sport and exercise science from the forthcoming STORK book. Available: doi.org/10.51224/SRX...
Register: mcmaster.zoom.us/meeting/regi...
All welcome!
January 26, 2024 at 11:08 AM
STORK (storkinesiology.org) are back with a journal club on Feb 7th!
We will kick off with a discussion of chpt 1 on philosophical concepts in sport and exercise science from the forthcoming STORK book. Available: doi.org/10.51224/SRX...
Register: mcmaster.zoom.us/meeting/regi...
All welcome!
We will kick off with a discussion of chpt 1 on philosophical concepts in sport and exercise science from the forthcoming STORK book. Available: doi.org/10.51224/SRX...
Register: mcmaster.zoom.us/meeting/regi...
All welcome!
Reposted by Scot Morrison
"We need less research, better research, and research done for the right reasons." --- Doug Altman
The Scandal of Poor Medical Research
www.bmj.com/content/308/...
#metascience #openscience
🧵 Thread 1/n
The Scandal of Poor Medical Research
www.bmj.com/content/308/...
#metascience #openscience
🧵 Thread 1/n
September 21, 2023 at 6:05 AM
"We need less research, better research, and research done for the right reasons." --- Doug Altman
The Scandal of Poor Medical Research
www.bmj.com/content/308/...
#metascience #openscience
🧵 Thread 1/n
The Scandal of Poor Medical Research
www.bmj.com/content/308/...
#metascience #openscience
🧵 Thread 1/n
I suspect much of the proxy failure we see in sports science is due to our failure to identify proxies that map reasonably well onto the constructs we care about. Maybe we should reduce discussions on goodharts law and just get better at using validity evidence to modulate our inferences
September 17, 2023 at 10:06 PM
I suspect much of the proxy failure we see in sports science is due to our failure to identify proxies that map reasonably well onto the constructs we care about. Maybe we should reduce discussions on goodharts law and just get better at using validity evidence to modulate our inferences
Reposted by Scot Morrison
2 types of editor responses when submitting measurement work to clinical journals:
1) If editor > 95 years: “Desk-reject. This is well known, see my PhD from 1931.”
2) Else: “Desk-reject. Measurement has no clinical relevance and should be published in specialized measurement journals.”
1) If editor > 95 years: “Desk-reject. This is well known, see my PhD from 1931.”
2) Else: “Desk-reject. Measurement has no clinical relevance and should be published in specialized measurement journals.”
September 2, 2023 at 10:40 AM
2 types of editor responses when submitting measurement work to clinical journals:
1) If editor > 95 years: “Desk-reject. This is well known, see my PhD from 1931.”
2) Else: “Desk-reject. Measurement has no clinical relevance and should be published in specialized measurement journals.”
1) If editor > 95 years: “Desk-reject. This is well known, see my PhD from 1931.”
2) Else: “Desk-reject. Measurement has no clinical relevance and should be published in specialized measurement journals.”
Reposted by Scot Morrison
This is a depressing observation. It depresses me most because there's a bunch of people who focus on the HARKing/p-hacking to the exclusion of other problems and their cause
August 29, 2023 at 4:09 PM
This is a depressing observation. It depresses me most because there's a bunch of people who focus on the HARKing/p-hacking to the exclusion of other problems and their cause
Reposted by Scot Morrison
Yes exactly! I've previously distinguished between "active" and "passive" HARKing to try to get at some of the issues you raise.
doi.org/10.1037/gpr0...
doi.org/10.1037/gpr0...
August 29, 2023 at 9:57 PM
Yes exactly! I've previously distinguished between "active" and "passive" HARKing to try to get at some of the issues you raise.
doi.org/10.1037/gpr0...
doi.org/10.1037/gpr0...
Reposted by Scot Morrison
All week I was planning to write a new blog about selection bias. But no time it seems. So in the meantime, here is older blog on important problem of not using back-alley statistical control but rather thinking causally. https://elevanth.org/blog/2022/09/02/there-are-no-magic-outcome-variables/
There Are No Magic Outcome Variables
I'm very sorry but I am going to write about statistics and causal inference again. I'd much rather be doing science. I'll make it brief.
I was reading a preprint about the relationship between kinsh...
elevanth.org
August 4, 2023 at 7:40 PM
All week I was planning to write a new blog about selection bias. But no time it seems. So in the meantime, here is older blog on important problem of not using back-alley statistical control but rather thinking causally. https://elevanth.org/blog/2022/09/02/there-are-no-magic-outcome-variables/
Reposted by Scot Morrison
Honestly, Chmess by Dennett is so worth the 13 minutes it takes to listen to it in our latest podcast (or the 8 to read it yourself). It completely changed which papers (or social media accounts for that matter) I engage with. https://nulliusinverba.podbean.com/e/prologus-13-chmess-d-c-dennett/
July 29, 2023 at 9:42 AM
Honestly, Chmess by Dennett is so worth the 13 minutes it takes to listen to it in our latest podcast (or the 8 to read it yourself). It completely changed which papers (or social media accounts for that matter) I engage with. https://nulliusinverba.podbean.com/e/prologus-13-chmess-d-c-dennett/