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02:58
@Szabolcs Well, if the strategy were to minimize the number of infected then it is quite obvious that borders should have been shut down, schools should be shut down, every place people meet at should be shut down etc. but the strategy of most countries is to strike some kind of balance between limiting infection and disruption to society.
 
1 hour later…
04:18
@halirutan Bill & Melinda Gates Foundation does a lot in China to fight against tuberculosis. I think they covers certain percentage fee of every TB testkit here.
People in China might be more willing to hoard food than people in many other countries during any crisis. Maybe only a few people know, that the recorded fifth deadly starvation in world history happened here, just around 1960. It's the time my parents' generation are young, the memory is still fresh passing down to my generation.
Grass roots and tree barks were regular food during that time. Protein sources from occasionally captured small wild animals, like mice, are real feast for a whole family. Elderly might choose to die in volunteer to save food for family members. (That's how my grandpa passed away - running away silently in the midnight and hiding in a cave starving to the end.)
All those are just 60 years ago. So yes, we still haven't forgotten what crisis looks like.
04:39
v12.1 is available on Wolfram Cloud. (Just found it accidentally. )
@xzczd Cool! So it looks like 12.1 will release soon?
05:09
Seems to be buggier than 12.0. And I already reported the regression quite a while ago...
DateListPlot[{}, PlotRange -> {{DateObject[{2019, 12, 3}], DateObject[{2020, 1, 3}]}, Automatic}] -> daily ticks missing for the partial week on the left. Didn't happen on 12.0.
I don't think keeping something like that not regressed would be rocket science...
@Silvia Hopefully :)
@kirma Rocket science? (Checking the dictionary… ) OK, learned something new :)
05:41
;)
 
1 hour later…
06:56
@Silvia i saw the documentary "one-child nation" on amazon prime, jesus those years must have been hard in china. what they did to pregnant women who had more than 1 child was the saddest thing i have ever saw, and everybody answered in the same way " there was no food"
07:49
Cheers from Eastern Europe. While concerns about level of democracy here are voiced I must say on community level people cooperate, in majority. I am surprised people stopped going to church and obey restrictions without being forced too. Are measures taken too severe? Maybe, I don't know enough to judge and it feels highly risky not to do it that way.
I am really interested to see how it unfolds in UK, and keeping my fingers crossed for them.
 
7 hours later…
14:54
@xzczd The documentation center has been updated for v12.1 as well.
4
 
2 hours later…
16:31
@Alucard That might interest you since it's specific for Italy thelancet.com/action/showPdf?pii=S0140-6736%2820%2930627-9
 
1 hour later…
17:32
@kirma Reminds me a weird bug of CounterPlot:
ContourPlot[
    x^2 + y^2 == 1,
    {x, -1, 1}, {y, -1, 1},
    MeshFunctions -> {#2 &},
    Mesh -> {{0}},
    MeshStyle -> Directive[Red, AbsolutePointSize[10]]
]
The two red mesh points are not drawn. A workaround is also weird: you need to repeat the mesh option like Mesh -> {{0}, {0}}.
@Silvia Interesting...
Since my last comments, the Finnish government announced plan to put emergency laws in place, in effect on Thursday, most drastic action since the second world war. I hope it helps, I just fear it's at least one week too late to avoid Italy-like outcome.
Let hope the best. I have wish to visit Finland since my friend there give me a Triple Orange liquid as new year gift.
Theoretically, I think social isolation might be good for academic research - like what Sir Isaac Newton did.
2
17:50
@Silvia Hih. You're welcome once borders are again open. (Although getting a visa for individual travel used to be a bit hard for Chinese citizens... lots to prove.)
Isaac Newton, pandemic isolation and pi on the same video:
@kirma We'll see. Maybe a world survived a pandemic will become a world better :D
Let's hope so!
18:08
Hey folks...just in case you haven't seen yet, Stephen is doing a Reddit AMA in an hour. reddit.com/r/IAmA
18:26
@JKlug When exactly will this start?
18:46
@halirutan I guess it's 3:00 (in my timezone). Should display differently on your side.
@Silvia major difference: Newton didn't have the internet!
19:01
@ChrisK Hmm.. So that explained why we no longer have Newton in modern days!
@halirutan I think it's happening: reddit.com/r/IAmA/comments/fjpw84/…
@Silvia Yep, see it now.
 
1 hour later…
20:26
@Silvia By eye, there is no delay between the cumulative cases and deaths curve in China. I would have expected a delay. Do you know why?
20:47
@Szabolcs Do you have the PDF graph instead of CDF graph? A delay might looks more obvious on PDF graph.
Are those curves both supposed to be logistic function?
Yes, in a way it is. But it's very hard to see for me.
data = ResourceData["Epidemic Data for Novel Coronavirus COVID-19"];

getCountry[name_] :=
 With[{c = Interpreter["Country"][name]},
  data[Select[#Country === c &], "ConfirmedCases"] // Total
  ]

getCountryDeaths[name_] :=
 With[{c = Interpreter["Country"][name]},
  data[Select[#Country === c &], "Deaths"] // Total
  ]
I just keep looking at Italy's curves these days and trying to figure out if it is already starting to slow down. I did the same with China's and it seemed basically impossible to tell until the slowdown became quite obvious.
Without actually see the delay, I would guess, because 60K out of 80K cases are in Wuhan or Hubei in early days of the epidemic, they could mostly be diagnosed or hospitalized too late.
I only managed to convinced my self when the derivative of the curve (not the log-values but actual values) started to decrease.
Let's try Korea.
@Szabolcs Italy's situation is quit different in the age histogram of the epicenter region. Wuhan does not have such a high fraction of elderly people.
@Szabolcs Agreed on trying Korea. So far I think they have provided the most perfect data, because their test covered a very large parts of their citizens.
On the other hand, maybe you could try China's data, but filter out Hubei and Wuhan?
Korea only had 75 deaths. The death curve is extremely noisy. It's 10 PM, and today I've biked for 2 hours in the forest to calm down. I'm really tired and sleepy.
I'll try again tomorrow.
20:57
Add to that questionable hygiene for situations like this (kissy-face greetings, lowest hand-washing rate in developed countries of Europe other than Netherlands) and Italy was ripe for this outcome. At least they are being quite serious about enforcing social distancing.

Here in San Francisco bay area, they just announced mandatory "Shelter in place" order, meaning non-essential businesses closed and individuals to stay home other than for necessities shopping / medical care.
The US gets a lot of criticism for bad and slow response, but it is definitely faster than that of Western European countries.
US states with very few cases have already acted, closing schools, trying to actually enforce social distancing in various ways.
I was watching Dr Campbell reviewing how the pandemic unfolding.
Germany just started to properly close schools and Worldometer is at ~7200 cases right now.
The situation in Italy is heartbreaking...
My colleague on business trip near NYC can not get home now (or maybe in next 2 months), because the flight ticket back to Hong Kong is prohibitedly expensive. We are looking for 20K US$ for single person.
Looking at the "PDF" curves for China above: there are those huge fluctuations are certain days like ~Feb 20, Feb 12, Feb 29. These appear to be data reporting anomalies. It seems that some data was reported one day early or one day late, but in the end it still adds up.
If we smooth these out (in our heads for now), it does appear that the cases curve peaks sooner than the deaths curve. Maybe 20 days sooner. Yes, this is "measured" by staring at the plot for 5 seconds, it's probably wrong.
I am really logging off now.
21:04
@Silvia And on the other side of that coin, a buddy was in Arizona for spring training, which was cancelled. His kids implored him not to fly back. So he rented a car. It only cost him $15 a day - they had so many car cancellations they just wanted to move them.
@Szabolcs They adjusted the clinic diagnose threshold several times.
@Szabolcs Good night then.
@ciao I feel a huge uncertainty waiting in two weeks later for America. Sincerely hope US CDC can begin to act fast.
5:06AM here. I think I should probably sleep too..
21:33
@Szabolcs Must say Ireland has done a good job of this. We shut down schools, colleges, etc before we even had 100 cases. Hopefully it's enough
22:08
Our strategy is supposedly to isolate old people, let the disease go through the younger population, and achieve herd immunity by late August or September so as to avoid a second peak in the autumn.
@Szabolcs In the US, lack of cases might be more due to lack of testing. Our state universities went online when there were 39 tests done in the state (Michigan)

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