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Just make sure youre comparing the same units
Persuasive messages that effectively change beliefs, attitudes, and behaviors often involve arousing negative emotions [31, 32], and the most effective tobacco control campaigns employ this strategy [33, 34]
FDA vs Reddit: 0% in trials, but 2/3 Reddit users rate this as severe/debilitating
Also, fixed effects model controls for all time-invariant factors and therefore its estimated changes in market outcome will not be biased by the variation in time-invariant factors between countries
In a case-control study, the odds ratio is a more meaningful statistic to compare the incidence of lung cancer between the two groups