The WSJ had a thoughtful opinion piece a couple of days ago. The author wanted to “quantify how many deaths were caused by delayed shutdown orders on a state-by-state basis”as a means to examine the efficacy of quick shutdown. Below are some key takeaways, and you can read the piece in full here.
“To normalize for an unambiguous comparison of deaths between states at the midpoint of an epidemic, we counted deaths per million population for a fixed 21-day period, measured from when the death rate first hit 1 per million—e.g.,‒three deaths in Iowa or 19 in New York state. A state’s “days to shutdown” was the time after a state crossed the 1 per million threshold until it ordered businesses shut down.
We ran a simple one-variable correlation of deaths per million and days to shutdown, which ranged from minus-10 days (some states shut down before any sign of Covid-19) to 35 days for South Dakota, one of seven states with limited or no shutdown. The correlation coefficient was 5.5%—so low that the engineers I used to employ would have summarized it as “no correlation” and moved on to find the real cause of the problem. (The trendline sloped downward—states that delayed more tended to have lower death rates—but that’s also a meaningless result due to the low correlation coefficient.)
No conclusions can be drawn about the states that sheltered quickly, because their death rates ran the full gamut, from 20 per million in Oregon to 360 in New York. This wide variation means that other variables—like population density or subway use—were more important. Our correlation coefficient for per-capita death rates vs. the population density was 44%. That suggests New York City might have benefited from its shutdown—but blindly copying New York’s policies in places with low Covid-19 death rates, such as my native Wisconsin, doesn’t make sense.”
The author then went on to examine Sweden’s policies (less restrictive than ours) and integrated those into his analysis:
“How did the Swedes do? They suffered 80 deaths per million 21 days after crossing the 1 per million threshold level. With 10 million people, Sweden’s death rate‒without a shutdown and massive unemployment‒is lower than that of the seven hardest-hit U.S. states—Massachusetts, Rhode Island, Louisiana, Connecticut, Michigan, New Jersey and New York—all of which, except Louisiana, shut down in three days or less.
We should cheer for Sweden to succeed, not ghoulishly bash them. They may prove that many aspects of the U.S. shutdown were mistakes—ineffective but economically devastating—and point the way to correcting them.”
Only time will tell what methodologies worked and what didn’t, but this is an important conversation to have, especially since the economy continues to worsen.