Paired t test | ||||||
------------------------------------------------------------------------------ | ||||||
Variable | Obs Mean Std. Err. Std. Dev. [95% Conf. Interval] | ||||||
---------+-------------------------------------------------------------------- | ||||||
n2 | 190 4.54e-09 .0470813 .6489704 -.0928723 .0928723 | ||||||
n1 | 190 7.05e-09 .0433629 .597716 -.0855374 .0855374 | ||||||
---------+-------------------------------------------------------------------- | ||||||
diff | 190 -2.51e-09 .0494481 .6815946 -.097541 .097541 | ||||||
------------------------------------------------------------------------------ | ||||||
mean(diff) = mean(n2 - n1) t = -0.0000 | ||||||
Ho: mean(diff) = 0 degrees of freedom = 189 | ||||||
Ha: mean(diff) < 0 Ha: mean(diff) != 0 Ha: mean(diff) > 0 | ||||||
Pr(T < t) = 0.5000 Pr(|T| > |t|) = 1.0000 Pr(T > t) = 0.5000 |
大家都用spss,但是洒家导师让俺用stata,这个结果是什么意思?为什么t是负的呢?倒数两行什么意思?