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Re: st: gologit2 interaction


From   lan zhang <[email protected]>
To   [email protected]
Subject   Re: st: gologit2 interaction
Date   Sun, 1 Sep 2013 15:59:03 -0400

the raw model:
gologit2 ma2 z2targetcrossus z2usinl z2chcross z2chdo woe jv rd network repoffice z2age unique z2location z2chsenior z2reve
> nue z2mconcentration z2var65 

Generalized Ordered Logit Estimates               Number of obs   =        230
                                                                                  LR chi2(48)     =     131.44
                                                                                   Prob > chi2     =     0.0000
Log likelihood = -190.91867                               Pseudo R2       =     0.2561

----------------------------------------------------------------------------------
             ma2 |      Coef.   Std. Err.      z    P>|z|     [95% Conf. Interval]
-----------------+----------------------------------------------------------------
0                |
 z2targetcrossus |  -.0173887   .1668386    -0.10   0.917    -.3443863    .3096089
         z2usinl |  -.2492047   .1905918    -1.31   0.191    -.6227578    .1243484
       z2chcross |    .103573   .1520177     0.68   0.496    -.1943763    .4015223
          z2chdo |  -.0393117   .1750591    -0.22   0.822    -.3824213    .3037979
             woe |  -.4751755   .6626994    -0.72   0.473    -1.774043    .8236915
              jv |  -1.083191   .7963511    -1.36   0.174    -2.644011    .4776286
              rd |   .9039168   .4271417     2.12   0.034     .0667344    1.741099
         network |   1.410567   .9212801     1.53   0.126    -.3951092    3.216242
       repoffice |  -1.001058   .4313348    -2.32   0.020    -1.846458   -.1556568
           z2age |   .1168134   .1774538     0.66   0.510    -.2309898    .4646165
          unique |   .6194533   .3772757     1.64   0.101    -.1199934      1.3589
      z2location |   .1114399   .1717018     0.65   0.516    -.2250895    .4479693
      z2chsenior |   .0730508   .1674231     0.44   0.663    -.2550924     .401194
       z2revenue |   -.014403    .165149    -0.09   0.931    -.3380891    .3092831
z2mconcentration |  -.2459377   .1718248    -1.43   0.152    -.5827081    .0908327
         z2var65 |   .2098376   .1512144     1.39   0.165    -.0865371    .5062123
           _cons |  -.4365704   .6758439    -0.65   0.518      -1.7612    .8880593
-----------------+----------------------------------------------------------------
1                |
 z2targetcrossus |   .5896636   .3993497     1.48   0.140    -.1930474    1.372375
         z2usinl |  -5.757507   3.010157    -1.91   0.056    -11.65731    .1422915
       z2chcross |   .3443698   .8501671     0.41   0.685    -1.321927    2.010667
          z2chdo |   .0274867   .3531697     0.08   0.938    -.6647132    .7196866
             woe |  -.1374271   .8539173    -0.16   0.872    -1.811074     1.53622
              jv |  -1.625354   1.073093    -1.51   0.130    -3.728578      .47787
              rd |   .2289301   .5789769     0.40   0.693    -.9058436    1.363704
         network |   .9461952   1.146079     0.83   0.409    -1.300079    3.192469
       repoffice |   .1904672   .6567114     0.29   0.772    -1.096663    1.477598
           z2age |   .3646071   .2886476     1.26   0.207    -.2011317     .930346
          unique |   .1462646   .6053367     0.24   0.809    -1.040174    1.332703
      z2location |   .3362546   .2857039     1.18   0.239    -.2237147     .896224
      z2chsenior |  -.6377379   .2899929    -2.20   0.028    -1.206114   -.0693622
       z2revenue |   .4384878   .2596045     1.69   0.091    -.0703277    .9473032
z2mconcentration |  -.3356207   .3044584    -1.10   0.270    -.9323481    .2611067
         z2var65 |    .680389   .2555405     2.66   0.008     .1795389    1.181239
           _cons |  -3.852209   1.534456    -2.51   0.012    -6.859688   -.8447304
-----------------+----------------------------------------------------------------
2                |
 z2targetcrossus |  -1.859479   .9033436    -2.06   0.040        -3.63   -.0889579
         z2usinl |   29.60616   10.01538     2.96   0.003      9.97637    49.23595
       z2chcross |  -6.148175    2.31656    -2.65   0.008    -10.68855   -1.607802
          z2chdo |  -2.199313   .9065691    -2.43   0.015    -3.976156   -.4224705
             woe |   4.507415   2.227588     2.02   0.043     .1414227    8.873408
              jv |   20.13766   566.9975     0.04   0.972    -1091.157    1131.432
              rd |  -3.677817   1.353729    -2.72   0.007    -6.331076   -1.024557
         network |  -20.33935   566.9957    -0.04   0.971    -1131.631    1090.952
       repoffice |   5.012434   2.120188     2.36   0.018     .8569423    9.167927
           z2age |   .5531285   .5823306     0.95   0.342    -.5882184    1.694475
          unique |   -7.34904   2.068999    -3.55   0.000     -11.4042   -3.293877
      z2location |   3.362253   .9824052     3.42   0.001     1.436774    5.287732
      z2chsenior |   .4177627   .4609106     0.91   0.365    -.4856056    1.321131
       z2revenue |   .8860638   .4915586     1.80   0.071    -.0773735    1.849501
z2mconcentration |   1.555764    .692565     2.25   0.025     .1983613    2.913166
         z2var65 |  -.5325391    .556961    -0.96   0.339    -1.624163    .5590843
           _cons |    8.84202   3.903878     2.26   0.024      1.19056    16.49348
----------------------------------------------------------------------------------
model with interaction:
. gologit2 ma2 z2targetcrossus z2usinl z2chcross z2chdo woe jv rd network repoffice z2age unique z2location z2chsenior z2reve
> nue z2mconcentration z2var65 z2targetrd

Generalized Ordered Logit Estimates               Number of obs   =        230
                                                  LR chi2(51)     =     148.17
                                                  Prob > chi2     =     0.0000
Log likelihood = -182.55401                       Pseudo R2       =     0.2887

----------------------------------------------------------------------------------
             ma2 |      Coef.   Std. Err.      z    P>|z|     [95% Conf. Interval]
-----------------+----------------------------------------------------------------
0                |
 z2targetcrossus |  -.1086327   .1786952    -0.61   0.543    -.4588687    .2416034
         z2usinl |   -.224747   .1906251    -1.18   0.238    -.5983653    .1488713
       z2chcross |   .1182669    .153385     0.77   0.441    -.1823621     .418896
          z2chdo |  -.1046159   .1873578    -0.56   0.577    -.4718305    .2625987
             woe |   -.531372   .6963073    -0.76   0.445    -1.896109    .8333653
              jv |   -1.16429   .8444907    -1.38   0.168    -2.819462     .490881
              rd |  -.2352473   .6686808    -0.35   0.725    -1.545838    1.075343
         network |   1.654026   .9829236     1.68   0.092    -.2724686    3.580521
       repoffice |  -1.165368   .4452497    -2.62   0.009    -2.038042   -.2926951
           z2age |   .0913011   .1810404     0.50   0.614    -.2635316    .4461339
          unique |   .6011205   .3888613     1.55   0.122    -.1610336    1.363275
      z2location |   .1073559   .1764745     0.61   0.543    -.2385278    .4532396
      z2chsenior |    .111229   .1726965     0.64   0.520    -.2272498    .4497079
       z2revenue |  -.0261089   .1675079    -0.16   0.876    -.3544183    .3022005
z2mconcentration |  -.2419455    .176234    -1.37   0.170    -.5873579    .1034668
         z2var65 |   .2004429   .1538167     1.30   0.193    -.1010322    .5019181
      z2targetrd |   .5360898   .2728751     1.96   0.049     .0012645    1.070915
           _cons |  -.1930397   .7108041    -0.27   0.786     -1.58619    1.200111
-----------------+----------------------------------------------------------------
1                |
 z2targetcrossus |   .9581676   .4375794     2.19   0.029     .1005277    1.815808
         z2usinl |  -7.478695   3.056712    -2.45   0.014    -13.46974    -1.48765
       z2chcross |    .183797   1.136537     0.16   0.872    -2.043775    2.411369
          z2chdo |   .0680997   .3728366     0.18   0.855    -.6626467    .7988461
             woe |  -.0332427   .8441079    -0.04   0.969    -1.687664    1.621178
              jv |  -2.196873   1.394514    -1.58   0.115    -4.930071    .5363247
              rd |   2.356204   1.012723     2.33   0.020     .3713034    4.341105
         network |   .5403172     1.4498     0.37   0.709    -2.301238    3.381872
       repoffice |      1.179   .7543806     1.56   0.118    -.2995585    2.657559
           z2age |   .3700746   .3043611     1.22   0.224    -.2264622    .9666115
          unique |   .0186732   .6888141     0.03   0.978    -1.331378    1.368724
      z2location |   .4302243   .3273268     1.31   0.189    -.2113244    1.071773
      z2chsenior |  -.9859917   .3561425    -2.77   0.006    -1.684018   -.2879651
       z2revenue |   .5751533   .2707602     2.12   0.034     .0444731    1.105833
z2mconcentration |   -.287354    .334713    -0.86   0.391    -.9433795    .3686715
         z2var65 |   .7992744   .2936887     2.72   0.006     .2236551    1.374894
      z2targetrd |  -.7707145   .3850767    -2.00   0.045    -1.525451   -.0159781
           _cons |  -4.906128   1.712643    -2.86   0.004    -8.262847    -1.54941
-----------------+----------------------------------------------------------------
2                |
 z2targetcrossus |   -1.40224    .940126    -1.49   0.136    -3.244853     .440373
         z2usinl |   27.85302   9.856849     2.83   0.005     8.533951    47.17209
       z2chcross |  -5.887844   2.251756    -2.61   0.009     -10.3012   -1.474484
          z2chdo |  -2.131811   .9187053    -2.32   0.020     -3.93244   -.3311814
             woe |   4.412064   2.322375     1.90   0.057    -.1397075    8.963836
              jv |   19.98229   628.5635     0.03   0.975     -1211.98    1251.944
              rd |  -2.206978   1.697812    -1.30   0.194    -5.534629    1.120673
         network |  -20.38483   628.5619    -0.03   0.974    -1252.343    1211.574
       repoffice |   5.196042   2.137634     2.43   0.015     1.006356    9.385727
           z2age |   .7685141   .6105997     1.26   0.208    -.4282392    1.965267
          unique |  -8.068043   2.163387    -3.73   0.000     -12.3082   -3.827882
      z2location |   3.371957   1.005542     3.35   0.001     1.401131    5.342782
      z2chsenior |   .3486575   .5132131     0.68   0.497    -.6572217    1.354537
       z2revenue |   .9434554   .5230482     1.80   0.071    -.0817001    1.968611
z2mconcentration |   1.711886   .6913372     2.48   0.013     .3568901    3.066882
         z2var65 |  -.4395993   .5783425    -0.76   0.447     -1.57313    .6939311
      z2targetrd |  -.6754823   .5818942    -1.16   0.246    -1.815974    .4650093
           _cons |   8.627572   3.824513     2.26   0.024     1.131665    16.12348
----------------------------------------------------------------------------------

my question is: variable like z2targetcrossus is not significant in the raw model, but the interaction z2targetrd=z2targetcrossus*rd is significant.
How could this happen?
can i still use this result in my study?

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