Three instances of the same Mathematical model. Tag, cards, NetLogo
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@zebm.bsky.social
Mathematical software developer. Resident of the formerly civilised UK.
Three instances of the same Mathematical model. Tag, cards, NetLogo
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Oops, should have said exponential growth. Obviously exponential decay is natural.
06.11.2025 23:21 β π 0 π 0 π¬ 0 π 0I hope it includes the word "exponential" and says that it has nothing to do with epidemiology whilst referencing Farr (1840), Kermack-McKendrick(1927), etc. etc.
06.11.2025 23:20 β π 0 π 0 π¬ 1 π 0I've seen several stochastic epidemic models that break the laws of Maths. The bridge between the two subjects is probability theory. You can use it to calculate the odds that an epidemic will grow exponentially.
stochanswers.com/education/ep...
This software may help,
stochanswers.com/downloads/ep...
Good luck. I hope you never say an epidemic grows exponentially. Although that was debunked in 1840, 1927, ... lots of people still insist on telling everyone that they failed basic Maths.
02.11.2025 17:44 β π 1 π 0 π¬ 1 π 0Then you should get back to Turin quickly before the local beer kills you. (I lived opposite the XXXX brewery, they used to make mango flavour beer)
24.10.2025 11:38 β π 0 π 0 π¬ 0 π 0During the mask mandate I wore a mask that I'd made from gauze. It had the same effectiveness as most others and the advantage that I needn't carry a knife to go with a surgical mask designed to stop pressurised bodily fluids from entering the nose and mouth when the wearer stabbed someone.
22.10.2025 23:00 β π 0 π 0 π¬ 0 π 0Every DAG has its day?
22.10.2025 22:54 β π 1 π 0 π¬ 0 π 0Will they be telling you next how to write ODEs? That would be lyrical.
22.10.2025 22:50 β π 0 π 0 π¬ 0 π 0It's not hard it's child's play :-)
stochanswers.com/education/ta...
And yet there are millions of Aussies, mainly on the coast. I once worked with them on a site with 4 different species of snake including the most deadly and an official snake catcher. We also had platypuses, Asian geckos (used to leave chalky white turds on my desk) and, presumably, spiders.
22.10.2025 22:44 β π 0 π 0 π¬ 1 π 0The first question that I asked Grok was how epidemics grow exponentially. So it told me. It should have told me not to be so silly and provided references back to 1840. LLMs are as ignorant as the average person. i.e. the weights are trained by "common knowledge"
22.10.2025 22:38 β π 0 π 0 π¬ 0 π 0A DNS of turbulence model that nearly works and runs on a laptop. #CFD #MathSky
stochanswers.com/studies/deca...
"Self reported mask wearing" π€‘
22.09.2025 15:32 β π 0 π 0 π¬ 1 π 0A teachers guide to the modelling of epidemics
#MathSky #StatsSky #EpiSky #EduSky
github.com/stochanswers...
As I said Cochrane. e.g. 2023
www.cochrane.org/evidence/CD0...
Get moving, indeed
stochanswers.com/education/ta...
If you want something more modern than the 1980s then there is the Cochrane Review which found that there was no decent evidence that they worked.
13.09.2025 11:32 β π 0 π 0 π¬ 1 π 0Here's a very simple model although the card game implementation is probably better to teach, the NetLogo gets a bit complicated but shows that the reproduction rate averages
to that of the standard SIR model.
stochanswers.com/education/ta...
So nothing on stochastic modelling of epidemics?
10.09.2025 23:17 β π 1 π 0 π¬ 1 π 0You said Vance belongs in The Hague which requires the ICC being able to enforce its will against a non-member. Mere charges are irrelevant. You really are delusional.
10.09.2025 23:13 β π 0 π 0 π¬ 1 π 0The reasonable worse case is logistic growth as has been known since 1927 (Kermack-McKendrick), in reality growth is less. Masks were debunked by the Common Cold Unit of the MRC before it closed at the end of the 1980s. Lockdowns decrease the number of infected thus leading to a second wave.
10.09.2025 23:09 β π 0 π 0 π¬ 1 π 0Your education was obviously lacking if you think the USA is a member of the ICC. Did Twitter block you for misinformation?
08.09.2025 23:03 β π 0 π 0 π¬ 1 π 0I just did a complaint flagging some of the prior art - Farr (1840), Kermack-McKendrick (1927). At least in recent years we're starting to see a little rigour with people placing "exponential growth" within double quotes. What happens and when to cause a finite variable to leave a curve to infinity?
08.09.2025 22:59 β π 0 π 0 π¬ 1 π 0I thought that was what happened 5/6 years ago. Dr Farr (1840) showed that epidemics do not grow exponentially.
08.09.2025 22:52 β π 0 π 0 π¬ 0 π 0It's Pontefract, what about the cakes?
07.09.2025 22:53 β π 0 π 0 π¬ 1 π 0Well the author, journal editor and reviewers all failed basic Maths for that paper.
07.09.2025 22:38 β π 0 π 0 π¬ 1 π 0There are only three things I know that grow exponentially - compound interest, grains of rice on a chessboard and pyramid schemes. Every other example seems to be due to the person failing basic Maths.
05.09.2025 20:09 β π 1 π 0 π¬ 0 π 0How do you explain all those epidemiologists, immunologists & virologists believing epidemics grow exponentially?
My explanation is that they failed basic Maths. AI, being interpolative weighted by the most common answer, just repeats the nonsense.