如何获得one-tailed t-test

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请问one-tailed t-test值是不是就是将two-tailed 除以二，前提是符合alternative hypothesis 如果不符就是1-除以二后的值

谢谢指点，急用，在线等

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关键词：T-test TAILED tail test Est hypothesis 在线 如何

更正上帖： 是one-tailed t-test 的p值

另外，请帮忙看看这句话对不对

Null hypothesis --- It's purpose is to determine if the obtained resutls provide a reason to reject the hypothesis that they are not merely a product of chande factors.

求好心人帮忙，谢谢！！

我与想知道

Usually, the Probability levels in t-test are two-tailed. To obtain the one-tailed probability, divide the two-tailed
probability by 2.

[此贴子已经被作者于2008-2-13 8:16:28编辑过]

谢谢，楼上的回答

使用one-tailed test和two-tailed test是跟统计假设有关的。其实是被经常忽略的问题。

To compute the one-tailed significance probability, first determine whether large values
of t are significant or small values are. Let p denote the significance probability
for the two-tailed test. If large values of t are significant, then the one-tailed probability
is p/2 if t >0, and is 1 − p/2 if t < 0. If small values of t are significant, then
the one-tailed probability is 1 − p/2 if t >0, and is p/2 if t < 0.

[此贴子已经被作者于2008-8-19 15:30:17编辑过]

sas/stat use's guide P4788

[此贴子已经被作者于2008-8-19 15:32:31编辑过]

7楼的，能再说清楚点吗？最好用中文表述，不胜感谢！如独立样本t检验H0:µ<=650;H1：µ>650,

用SPSS的双尾检验p值＝0.009，t值＝－2.64，究竟接受还是拒绝原假设？

那如果是配对样本，又该怎么操作呢？谢谢

 

[此贴子已经被作者于2008-8-20 11:45:43编辑过]

这是一个问题，spss为什么没有单尾呢