![]() ![]() So with p-hacking, the distribution of p-values has more "small" p-values and fewer high ones - under H0, the proportion of values less than alpha is higher that alpha. The direction of the effect of that sort of activity is unrelated to sample size the size of the effect of it may (weakly) change with sample size in some cases, but it will be present at every sample size. This encompasses all manner of activities - most typically cases where the data inform the process of testing carried out on the same data (including testing the assumptions, if that in any way affects your choice of analysis). Typically in an effort to find something to write about people will do things that make them more likely to reject by continuing to act as if they had not done those things, they're computing p-values in a way that doesn't account for their actions, making their p-values calculated in the way they do lower than they should be. Under p-hacking that distribution is no longer uniform. Specifically, for a continuously distributed test statistic if H0 is true, the p-values should be uniformly distributed between 0 and 1 (so that for a test at level alpha, the proportion of the p-values that are ≤ alpha is alpha ie the rejection rate under H0 is actually the alpha we said it was, for any alpha). P-hacking is undertaking a strategy (whether deliberately or not) which produces p-values that don't have the correct properties, typically moving a correctly-calculated p-value lower than what it was specified to be. It's not clear quite what you're getting at. R-bloggers - blog aggregator with statistics articles generally done with R software. Kaggle ![]() Self posts with throwaway accounts will be deleted by AutoModerator Memes and image macros are not acceptable forms of content. Just because it has a statistic in it doesn't make it statistics. Please try to keep submissions on topic and of high quality. They will be swiftly removed, so don't waste your time! Please kindly post those over at: r/homeworkhelp. This is not a subreddit for homework questions. All Posts Require One of the Following Tags in the Post Title! If you do not flag your post, automoderator will delete it: Tag
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