Saturday, April 11, 2020

COVID-19 Projection Models Are Proving to Be Unreliable

By Andrew C. McCarthy - April 11, 2020 at 09:33AM

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To describe as stunning the collapse of a key model the government has used to alarm the nation about the catastrophic threat of the coronavirus would not do this development justice.

In a space of just six days starting April 2, two revisions (on April 5 and 8) have utterly discredited the model produced by the University of Washington’s Institute for Health Metrics and Evaluation. I wrote about the IHME’s modeling at National Review on Monday, the day after the first revision — which was dramatic, but pales in comparison to Wednesday’s reassessment. This was not immediately apparent because the latest revision (April 8) did not include a side-by-side comparison, as did the April 5 revision. Perusal of the new data, however, is staggering, as is what it says about government predictions we were hearing just days ago about the likelihood of 100,000 deaths, with as many as 240,000 a real possibility.

As I noted in my last post on this subject, by April 5, the projection of likely deaths had plunged 12 percent in just three days, 93,531 to 81,766. Understand, this projection is drawn from a range; on April 2, IHME was telling us cumulative COVID-19 deaths could reach as high as approximately 178,000. The upper range was also reduced on April 5 to about 136,000.

On April 8, the projected cumulative deaths were slashed to 60,145 (with the upper range again cut, to about 126,000). That is, in less than a week, the model proved to be off by more than 33 percent.

My use of the term “off” is intentional. There is no shortage of government spin, regurgitated by media commentators, assuring us that the drastic reductions in the projections over just a few days powerfully illustrate how well social distancing and the substantial shuttering of the economy is working. Nonsense. As Alex Berenson points out on Twitter, with an accompanying screenshot data updated by IHME on April 1, the original April 2 model explicitly “assum[ed] full social distancing through May 2020.”

The model on which the government is relying is simply unreliable. It is not that social distancing has changed the equation; it is that the equation’s fundamental assumptions are so dead wrong, they cannot remain reasonably stable for just 72 hours.

And mind you, when we observe that the government is relying on the models, we mean reliance for the purpose of making policy, including the policy of completely closing down American businesses and attempting to confine people to their homes because, it is said, no lesser measures will do. That seems worth stressing in light of this morning’s announcement that unemployment claims spiked another 6.6 million (now well over 16 million in just the past couple of weeks)...

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