COVID-19: We Need Random Testing

By
Original story posted on: March 25, 2020

Testing a limited number of random people, we can reach conclusions within a certain probability.

Statistical analysis is a funny thing. It turns out that you don’t need a lot of data to reach a conclusion. At the start of the play “Rosencrantz and Guildentstern are Dead,” the two main characters, bit players in Shakespeare’s Hamlet, are flipping a coin. The coin has come up heads 92 times in a row. The action starts when the coin finally comes up tails. Mathematically, if you flip a coin, the chances it will be heads or tails is 50 percent. If you flip the coin again, though, the odds that it will be heads the second time drop to only 25 percent. 

Why is this important? Well, in reaching decisions about a characteristic in a group, like exposure to COVID-19, at some point, by testing a limited number of random people, we can reach conclusions within a certain probability.

In statistics, we call these confidence levels. These levels are most often given as 95 percent or 99 percent. Now, here is the interesting part. Whether our sample size is the one million people in a particular city or the 365 million people living in the United States, the sample size to determine a characteristic does not change a lot. Remember my coin example? 

Based on statistics, and assuming people have similar characteristics, if I sample 16,369 people in a group of a million people, I can determine within 99 percent probability the percentage of people with COVID-19. If I increase the sample size to 365 million people, the sample size only increases to 16,640. 

Instead of only sampling people who are sick and may have COVID-19, if we test random samples, both nationally and locally, we can make better decisions and cut through the fear.  

Timothy Powell, CPA CHCP

Timothy Powell is a nationally recognized expert on regulatory matters, including the False Claims Act, Zone Program Integrity Contractor (ZPIC) audits, and U.S. Department of Health and Human Services (HHS) Office of Inspector General (OIG) compliance. He is a member of the RACmonitor editorial board and a national correspondent for Monitor Mondays.

This email address is being protected from spambots. You need JavaScript enabled to view it.

Related Articles

  • As Hospitals Locked Down, Others Have Been Locked Out
    Leading case management during COVID-19. Towards the end of the most recent COVID-19 surge, an employee working from home mentioned how isolated they felt, and how lucky I was to go into work every day. That sat with me for…
  • Face to Virtual Face
    Expansion of telehealth services and vaccine news are included in this report. The Patient Protection and Affordable Care Act (PPACA) established a face-to-face encounter requirement for certification of eligibility for Medicare home health services, by requiring the certifying physician to…
  • COVID Crime Goes Viral
    Crime doesn’t pay, but it’s costing headaches for many. The COVID-19 vaccination program has stimulated one of the largest crime waves in history – and it also may turn out to be one of the most lucrative. For crooks, the…