各个参数怎么那么大，拟合优度居然是0，p值基本快接近1了，表示解释变量和被解释变量基本完全没有相关性啊

1、reg回归结果是没有e(p)的。
所以 di e(p)是没有结果的


2、你查看outreg2的帮助，outreg2能输出是因为该命令说了会自动计算e(p)

    statistic in a local macro and then put that into addstat( ):

    regress mpg rep78 headroom
    test rep78
    local F1 = r(F)
    test headroom
    outreg2 using 2test, addstat(Test1 F, `F1', Test2 F, `r(F)')

    If it is missing, outreg2 will automatically calculate e(p), which is
    presumably the F-test or chi-square-test of significance of a
    regression.

    outreg2 using myfile, addstat(F test, e(p))

    Another example would be to report a pseudo R-squared after a logit
    estimation, which outreg2 does not otherwise report.

    logit foreign price trunk weight
    outreg2 using myfile, addstat(Pseudo R-squared, `e(r2_p)')