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Type I and Type II errors

multiple Hypothesis Testing and False Discovery Rate (Some materials are from ) STATC141 Type I and Type II errors Type I error, also known as a false positive : the error of rejecting a null hypothesis when it is actually true. In other words, this is the error of accepting an alternative hypothesis (the real hypothesis of interest) when the results can be attributed to chance. Plainly speaking, it occurs when we are observing a difference when in truth there is none (or more specifically - no statistically significant difference). So the probability of making a type I error in a test with rejection region R is 0( | is true)P R H. Type II error, also known as a "false negative": the error of not rejecting a null hypothesis when the alternative hypothesis is the true state of nature.

when statistical tests are used repeatedly, for example while doing multiple comparisons to test null hypotheses stating that the averages of several disjoint populations are equal to each other (homogeneous). Intuitively, even if a particular outcome of …

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