方差分析（F检验）是单侧还是双侧？

方差分析（F检验）是单侧还是双侧？ 考研屋 www.kaoyanwu.com 提供各大机构考研、公务员、四六级辅导视频课程 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? 考研屋www.kaoyanwu.com :提供各大机构考研、公务员、四六级辅导视频课程 专业提供提供各大机构考研、公务员、四六级辅导视频课