... <看更多>

What you're calling "t-value" is probably what I'm calling "test statistic". In order to calculate a p-value (remember, it's just a probability) you need a ... ... <看更多>

From http://docs.scipy.org/doc/scipy/reference/tutorial/stats.html. As an exercise, we can calculate our ttest also directly without using ... ... <看更多>

First I test with a normal t.test without any distribution transformations. The results below show a p-value < .001 supporting the alternative hypothesis that “ ... ... <看更多>