方差分析(F检验)是单侧还是双侧?
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张老的书说是单侧。但这里有两个material有不同说法:One-Tailed or Two?Is the probability
value from an F ratio a one-tailed or a two-tailedprobability? In the literal sense, it is a one-tailed probability since, as you can see in Figure 1, the probability is the area in the right-hand tail of the distribution. However, the F ratio is sensitive to any pattern of differences among means. It is therefore a test of a two-tailed hypothesis and is best considered a two-tailed test.1. Only a few statistical tests even can have one tail: z tests and t tests. So you’re severely limited. F tests,
Chi-square tests, etc. can’t accomodate one-tailed tests because their distributions are not
symmetric. Most statistical methods, such as regression and ANOVA, are based on these tests, so you will rarely have the chance to implement
them.://onlinestatbook.com/chapter13/one-way.htmlWhat s yr opinion?
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