This error likely had the effect of muting volatility by a factor of two and of lowering the VaR .

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Many of the experiments that appear to provide evidence of an effect are flawed, subject to experimental error, or are difficult to interpret.

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So if you make Sudafed hard to buy but it does not have a lasting effect on meth abuse, that would be Type I error.

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Once again, neither effect was large enough that it lay outside the margin of error.

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Much of the placebo effect seen in clinical trials is the combination of the natural tendency of patients to get better and measurement error.

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