I was reading a couple of articles on modeling around the world, why there are so many different numbers being thrown around and wanted to share a thought. Beware of the fear mongering that sometimes goes on, specially in how US media reports information. Dramatic headlines get more reads. I am not saying the media is at all lying (well I am only taking about the real journalistic ones). More what I am saying is that there are different models out there, and none of them are anywhere near perfect yet. Different groups use different assumptions, and they feed different data in. In modeling as more and more data comes in the prediction ranges, which can start out VERY large about disease and death prediction, narrows the more into the curve a country goes. So initially you may see a headline that says “as many as xxx may die!” What they may be is one worst case scenario of one model. Another may try to downplay and say “only yyy will die,” and that may the one of the best case scenarios of another model. Statisticians and experts know the models are guesstimates, and they may have extreme numbers at the edges. They don’t view it as the truth, rather a useful guide. But when this is reduced to a simple headline it can (appropriately) cause fear and panic.
Also when people are confused about why advice is suddenly changed (like in UK) it may be from new data coming in. For example from what I read the advice in UK was made more stricter as more data came in from Italy from real life cases, and a paper was published showing a much higher rate of asymptomatic spread than previously guesstimated. These changes showed a different potential set of results, which led to the stricter rules.
What I am saying is try to look behind the reduced headlines when you see “projections” into what may happen. Obviously it makes more sense to be extra cautious than cavalier if you are policy maker. But please don’t take shifting models or shifting strategies as we have more concrete data as a lack of knowledge. This does not apply when policy makers are actively lying and rejecting advice from experts, that is just criminal and careless negligence.
There was a great quote in a Guardian article that I love:
Never have the words of the British statistician George Box rung truer than in this pandemic: “All models are wrong, but some are useful.”