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Showing posts with label Statistics. Show all posts
Showing posts with label Statistics. Show all posts

Thursday 16 April 2020

Coronavirus Lockdown Effectiveness, Other Doubts



One of the few certainties about this novel virus and the pandemic it is spreading is that, being new (or at least new to us, namely newly discovered), we don't know very much about it, and we are constantly learning about it all the time.

But, being human and not liking uncertainty in a similar way in which nature abhors vacuum, we try to jump to conclusions, any conclusion, in fact, just to avoid doubt, chaos and disorder (a very natural feeling). So we grab at many different explanatory theories, whether supported a lot, a little or not at all.

This is The Times of Israel reporting on the theory held by someone the newspaper describes as a top Israeli mathematician:
"I have no explanation but the numbers speak for themselves."

Top Israeli prof claims simple stats show virus plays itself out after 70 days.

Isaac Ben-Israel, who is not a medical expert, says analysis worldwide shows new cases peaking after about 40 days, slams economic closures; leading doctor dismisses his claims.
So, according to Professor Ben-Israel, head of the Security Studies program in Tel Aviv University and the chairman of the National Council for Research and Development, "simple statistical analysis demonstrates that the spread of COVID-19 peaks after about 40 days and declines to almost zero after 70 days — no matter where it strikes, and no matter what measures governments impose to try to thwart it."

What is intriguing is that, minus the mathematical and statistical calculations, a similar view, at least in its practical conclusions, is supported by another person in the news, who has been accused of "anti-Semitism", ie David Icke:
On Wednesday night Icke shared his unsubstantiated views in an edited interview for London Real: COVID-19, and shared baseless claims on coronavirus including that mandatory vaccination for the virus would be 'fascism' and include 'nanotechnology microchips'.

… he appeared to justify attacks on 5G masts around the UK, adding 'human life as we know it is over' if the construction continued.

The 5G theory has been discredited by experts, with Public Health England stating that 'the overall exposure is expected to remain low relative to guidelines and, as such, there should be no consequences for public health.' The new coronavirus is also spreading in places without 5G networks, including in Iran.
Strange bedfellows as they may be, Icke shares with Professor Ben-Israel the hypothesis that the lockdown doesn't help to limit the spread of Covid-19, as shown on this tweet of his with a diagram comparing countries with and without lockdown measures:

Covid-19-Lockdown Countries Compared

Compare this image, though, with the one pictured above this post and you'll see how focusing only on deaths per million and removing cases per million gives a very different picture: this should provide an indication of the complexity of the issue, which doesn't lend itself to over-simplifications, much as we would love to rely on them.

Icke is not the only one to believe in the uselessness of lockdowns, there are many, especially among conservative and Right-oriented people, who are sceptical of their government's policies and think the same.

Now, I am in no position to categorically declare that this idea is right or wrong. As I said at the beginning, we don't have enough information.

I do have some doubts about using pure mathematics to arrive at conclusions like those of Ben-Israel on this. Correlation doesn't mean and doesn't necessarily involve causation. In Latin, this supremely logical and succinct language, it's better: post hoc ergo propter hoc is a fallacy.

For example, is it possible that countries with less contact with the rest of the world and therefore fewer opportunities for contagion (ah, the joys of globalisation! we have finally discovered them in their full glory) have had lower numbers of cases of Covid-19 and therefore had a comparable smaller need for lockdown than those with more international traffic and Coronavirus spread which as a consequence resorted more to lockdown, inverting the cause-effect direction?

Has this been considered as a contributing factor, anyway?

At least we have a glimmer of hope, though: it's the prediction on the progress of the disease in Israel made by Professor Ben-Israel on last 12 April on Facebook, which I have to reproduce in its online translation:
It turns out that the expansion of the expansion [meaning, I presume, the peak] has been behind us for about a week, and apparently it will fade almost completely in about two weeks.
Assuming the translation is accurate, we can wait about two weeks to see if his prediction for Israel materialises and test whether his theory might be correct.