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Predictions With and Without Confidence Intervals: Puerto Rico Post-Maria

Compare this assessment (5/31/2018):

Thus, the data suggests that the hurricane accelerated the deaths of ill and dying people, rather than killing them outright. I would expect the excess deaths at a year horizon (through, say, Oct. 1, 2018) to total perhaps 200-400. Still a notable number, but certainly not 4,600.

With a contemporaneous prediction:

From the survey data, we estimated a mortality rate of 14.3 deaths (95% confidence interval [CI], 9.8 to 18.9) per 1000 persons from September 20 through December 31, 2017. This rate yielded a total of 4645 excess deaths during this period (95% CI, 793 to 8498), equivalent to a 62% increase in the mortality rate as compared with the same period in 2016.

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PoMo Micro

A reader writes (in discussing the Taylor rule):

Like [the] price elasticity of demand, we have an analytical approach that is appealing in theory, but so ill defined as to be useless in practice.

Wow. I haven’t read anything like that since I read Anti-Samuelson. Believe it or not, this was written by a person who purports to do policy analysis.