请问ttest里输出结果的Pr值是什么,是p_value吗?
例如:
Paired t test
------------------------------------------------------------------------------
Variable | Obs Mean Std. Err. Std. Dev. [90% Conf. Interval]
---------+--------------------------------------------------------------------
a_neti~1 | 555 98874.44 34245.35 806767 42451.5 155297.4
b_neti~1 | 555 88992.16 44566.32 1049913 15564.3 162420
---------+--------------------------------------------------------------------
diff | 555 9882.284 12682.98 298791.2 -11014.3 30778.87
------------------------------------------------------------------------------
mean(diff) = mean(a_netincome1 - b_netincome1) t = 0.7792
Ho: mean(diff) = 0 degrees of freedom = 554
Ha: mean(diff) < 0 Ha: mean(diff) != 0 Ha: mean(diff) > 0
Pr(T < t) = 0.7819 Pr(|T| > |t|) = 0.4362 Pr(T > t) = 0.2181
多谢!