问题:下面的三个p值分别代表什么?如何看方差齐不齐。 谢谢。期待答复。
- . sdtest Msms, by(jd)
- Variance ratio test
- ------------------------------------------------------------------------------
- Group | Obs Mean Std. Err. Std. Dev. [95% Conf. Interval]
- ---------+--------------------------------------------------------------------
- 0 | 1,194 9.947236 .1225061 4.233115 9.706885 10.18759
- 1 | 1,197 10.11028 .129971 4.496696 9.855279 10.36527
- ---------+--------------------------------------------------------------------
- combined | 2,391 10.02886 .0893067 4.366907 9.853732 10.20398
- ------------------------------------------------------------------------------
- ratio = sd(0) / sd(1) f = 0.8862
- Ho: ratio = 1 degrees of freedom = 1193, 1196
- Ha: ratio < 1 Ha: ratio != 1 Ha: ratio > 1
- Pr(F < f) = 0.0185 2*Pr(F < f) = 0.0369 Pr(F > f) = 0.9815
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