March 6, 2019
If Not Now, It’s Too Late: Clinical Science Is Futile If We Study the Wrong Population
In 1936, the Literary Digest, a respected national magazine, undertook a public opinion poll. Who would win the race between Republican Alfred Landon, governor of Kansas, and Democratic incumbent Franklin D. Roosevelt? Mock ballots were mailed to 10 million Americans. About 2.4 million responded—one of the largest survey samples ever created. Their prediction? Landon would carry the day. They were wrong—by a landslide for FDR. That’s because respondents were biased toward Landon and did not accurately represent the distribution of presidential preferences across all voters. Notably, George Gallop accurately predicted FDR’s victory using a smaller representative sample of about 50,000…
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