求助~stata中imb命令请教

奥兹曼提斯

3925

收藏 2019-07-27

想问问大家stata使用imb命令时提示matrix r(imbal) not found怎么办？<br>
是在做cem的过程中先做了回归，第二步测单变量不平衡程度的过程中使用的imb

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奥兹曼提斯

2019-7-27 15:47:21

. tab 质量new

质量new |    Freq.    Percent       Cum.
------------+-----------------------------------
      0 |    8,794    51.29    51.29
      1 |    8,351    48.71    100.00
------------+-----------------------------------
   Total |    17,145    100.00

. reg roe1 质量new

   Source |    SS          df    MS    Number of obs = 12,357
-------------+---------------------------------- F(1, 12355)    =    1.82
   Model |  78.1085034       1  78.1085034 Prob > F       = 0.1777
Residual |  531177.972 12,355  42.9929561 R-squared    = 0.0001
-------------+---------------------------------- Adj R-squared = 0.0001
   Total |  531256.081 12,356  42.9957981 Root MSE       = 6.5569

------------------------------------------------------------------------------
      roe1 |    Coef. Std. Err.    t P>|t|    [95% Conf. Interval]
-------------+----------------------------------------------------------------
   质量new |  -.1600834 .118767 -1.35 0.178 -.3928852 .0727184
   _cons | .1951722 .088704    2.20 0.028    .0212984 .3690459
------------------------------------------------------------------------------

. imb year industy,treatment(质量new)

Multivariate L1 distance: .50107423

Univariate imbalance:
matrix r(imbal) not found
r(111);