==============================================================================
       y=1       coef    std err          z      P>|z|      [95.0% Conf. Int.]
------------------------------------------------------------------------------
const         -0.2794      0.612     -0.457      0.648        -1.479     0.920
x1            -0.0119      0.034     -0.350      0.727        -0.079     0.055
x2             0.2946      0.093      3.152      0.002         0.111     0.478
x3            -0.0257      0.007     -3.873      0.000        -0.039    -0.013
x4             0.0897      0.069      1.297      0.195        -0.046     0.225
------------------------------------------------------------------------------
       y=2       coef    std err          z      P>|z|      [95.0% Conf. Int.]
------------------------------------------------------------------------------
const         -1.7392      0.720     -2.414      0.016        -3.151    -0.327
x1            -0.0941      0.039     -2.415      0.016        -0.170    -0.018
x2             0.3838      0.108      3.559      0.000         0.172     0.595
x3            -0.0230      0.008     -2.914      0.004        -0.038    -0.008
x4             0.2451      0.080      3.053      0.002         0.088     0.402
------------------------------------------------------------------------------
       y=3       coef    std err          z      P>|z|      [95.0% Conf. Int.]
------------------------------------------------------------------------------
const         -3.0091      1.069     -2.815      0.005        -5.104    -0.914
x1            -0.1115      0.057     -1.965      0.049        -0.223    -0.000
x2             0.5641      0.159      3.557      0.000         0.253     0.875
x3            -0.0156      0.011     -1.391      0.164        -0.038     0.006
x4             0.0687      0.119      0.577      0.564        -0.165     0.302
------------------------------------------------------------------------------
       y=4       coef    std err          z      P>|z|      [95.0% Conf. Int.]
------------------------------------------------------------------------------
const         -6.5607      0.870     -7.540      0.000        -8.266    -4.855
x1            -0.0949      0.043     -2.183      0.029        -0.180    -0.010
x2             1.2668      0.128      9.897      0.000         1.016     1.518
x3            -0.0109      0.008     -1.315      0.189        -0.027     0.005
x4             0.3067      0.088      3.475      0.001         0.134     0.480
------------------------------------------------------------------------------
       y=5       coef    std err          z      P>|z|      [95.0% Conf. Int.]
------------------------------------------------------------------------------
const         -6.0760      0.774     -7.851      0.000        -7.593    -4.559
x1            -0.0967      0.039     -2.479      0.013        -0.173    -0.020
x2             1.3377      0.116     11.493      0.000         1.110     1.566
x3            -0.0198      0.008     -2.631      0.009        -0.035    -0.005
x4             0.3193      0.080      4.001      0.000         0.163     0.476
------------------------------------------------------------------------------
       y=6       coef    std err          z      P>|z|      [95.0% Conf. Int.]
------------------------------------------------------------------------------
const        -10.5973      0.957    -11.076      0.000       -12.473    -8.722
x1            -0.1447      0.042     -3.475      0.001        -0.226    -0.063
x2             2.0395      0.141     14.479      0.000         1.763     2.316
x3            -0.0129      0.008     -1.612      0.107        -0.029     0.003
x4             0.4576      0.085      5.352      0.000         0.290     0.625
==============================================================================
