format设置固定格式，比如%9.3f即可。
具体解释：
The %f format

    In %w.df, w is the total output width, including sign and decimal point,
    and d is the number of digits to appear to the right of the decimal
    point.  The result is right-justified.

    The number 5.139 in %12.2f format displays as

        ----+----1--
                5.14
        

    When d==0, the decimal point is not displayed.  The number 5.14 in %12.0f
    format displays as

        ----+----1--
                   5

    %-w.df works the same way, except that the output is left-justified in
    the field.  The number 5.139 in %-12.2f displays as

        ----+----1--
        5.14

详见官网解释：http://www.stata.com/help.cgi?format#fformat

请问最后怎么解决的？

同问同问同问

logout, save("Results/table3_Var_corr") dec(3) excel replace:  pwcorr_a $vvv

corr2docx Y X1 X2  using corr2.docx, replace star fmt(%9.3f)