By AARON E. CARROLL from NYT The Upshot
https://ift.tt/2vEZTQs
Selection bias can creep in, even when a study design seeks to control for other variables.
The Ineffectiveness of Employer Wellness Programs, and the Importance of Randomized Trials
By AARON E. CARROLL from NYT The Upshot
https://ift.tt/2vEZTQs
Selection bias can creep in, even when a study design seeks to control for other variables.
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