[no subject]

["Benedikt London" <benedikt_london@hotmail.com>]

Hi!  I am working with panel data using Stata v7.  In order to estimate the 
probability of a site adopting a certain technology I am using hazard-rate 
specifications.

Running the Lognormal regression (streg - dist(lognormal)) I seem to be 
getting inverse results to the one's from Weibull (streg - dist(weibull)) 
(see results below).

Any pointers helping me understand the differences would be much 
appreciated.

Thanks,
Benedikt.


174 . streg SC_locus_core_MS PC_Complex_Core PC_Complex_Peri_DA 
PC_Complex_Peri_EA

> SC_complex_change_lbase SC_arc_change SC_comp_change IND_G_Service 
> IND_G_Manu
> f LOG_Emp IT_Intensity IT_Dev LOG_Server LOG_Ntwrk, dist(weibull)
     ...

     Weibull regression -- log relative-hazard form

     No. of subjects =         4989                     Number of obs   =   
   4989
     No. of failures =         1713
     Time at risk    =         8356
                                                        LR chi2(14)     =   
5724.20
     Log likelihood  =   -669.04683                     Prob > chi2     =   
 0.0000

     
------------------------------------------------------------------------------
               _t | Haz. Ratio   Std. Err.      z    P>|z|     [95% Conf. 
Interval]
     
-------------+----------------------------------------------------------------
     SC_locus_c~S |   7.67e+08   2.15e+11     0.07   0.942     2.83e-230    
2.08e+24
     PC_Complex~e |   .9599559   .0263458    -1.49   0.136     .9096833    
1.013007
     PC_Comple~DA |   .9993526   .0359207    -0.02   0.986     .9313719    
1.072295
     PC_Comple~EA |   .9137738   .0218846    -3.77   0.000     .8718718    
.9576895
     SC_com~lbase |   1.054812   .1046327     0.54   0.591     .8684401    
1.281181
     SC_arc_cha~e |   .6622062   .1495885    -1.82   0.068     .4253161    
1.031038
     SC_comp_ch~e |   1.035305   .0576771     0.62   0.533     .9282131    
1.154753
     IND_G_Serv~e |   .9587473   .0807536    -0.50   0.617     .8128473    
1.130835
      IND_G_Manuf |   .9930614   .0859979    -0.08   0.936     .8380368    
1.176763
          LOG_Emp |   1.038066   .0395384     0.98   0.327     .9633937    
1.118526
     IT_Intensity |   2.359489   .7533794     2.69   0.007     1.261919    
4.411687
           IT_Dev |   .3495068   .2044643    -1.80   0.072     .1110442    
1.100057
       LOG_Server |   .9911896   .0342807    -0.26   0.798     .9262273    
1.060708
        LOG_Ntwrk |   .9999756   .0420713    -0.00   1.000     .9208255    
1.085929
     
-------------+----------------------------------------------------------------
            /ln_p |   1.154546   .0189167    61.03   0.000      1.11747    
1.191622
     
-------------+----------------------------------------------------------------
                p |   3.172583   .0600148                       3.05711    
3.292418
              1/p |   .3152006   .0059626                      .3037282    
.3271063
     
------------------------------------------------------------------------------



  178 . streg SC_locus_core_MS PC_Complex_Core PC_Complex_Peri_DA 
PC_Complex_Peri_EA
     > SC_complex_change_lbase SC_arc_change SC_comp_change IND_G_Service 
IND_G_Manu
     > f LOG_Emp IT_Intensity IT_Dev LOG_Server LOG_Ntwrk, dist(lognormal)

              failure _d:  SC_locus_core_MS
        analysis time _t:  t
     ...

     Log-normal regression -- accelerated failure-time form

     No. of subjects =         4989                     Number of obs   =   
   4989
     No. of failures =         1713
     Time at risk    =         8356
                                                        LR chi2(14)     =   
5515.62
     Log likelihood  =   -542.18236                     Prob > chi2     =   
 0.0000

     
------------------------------------------------------------------------------
               _t |      Coef.   Std. Err.      z    P>|z|     [95% Conf. 
Interval]
     
-------------+----------------------------------------------------------------
     SC_locus_c~S |  -2.784133   32.25093    -0.09   0.931    -65.99479    
60.42653
     PC_Complex~e |   .0127173   .0086475     1.47   0.141    -.0042315    
.0296661
     PC_Comple~DA |  -.0019033   .0114566    -0.17   0.868    -.0243578    
.0205512
     PC_Comple~EA |   .0309895   .0076347     4.06   0.000     .0160258    
.0459533
     SC_com~lbase |  -.0346015   .0338963    -1.02   0.307    -.1010369     
.031834
     SC_arc_cha~e |   .1680083   .0770845     2.18   0.029     .0169254    
.3190911
     SC_comp_ch~e |  -.0167932   .0202866    -0.83   0.408    -.0565542    
.0229678
     IND_G_Serv~e |    .010267   .0278289     0.37   0.712    -.0442766    
.0648106
      IND_G_Manuf |  -.0014168   .0289121    -0.05   0.961    -.0580834    
.0552498
          LOG_Emp |  -.0113104   .0126465    -0.89   0.371    -.0360972    
.0134764
     IT_Intensity |  -.2025714   .0977681    -2.07   0.038    -.3941934   
-.0109494
           IT_Dev |   .2683782   .2040441     1.32   0.188    -.1315409    
.6682973
       LOG_Server |  -.0004663   .0116539    -0.04   0.968    -.0233074    
.0223749
        LOG_Ntwrk |  -.0021339    .014077    -0.15   0.880    -.0297244    
.0254566
            _cons |   2.876312   32.25103     0.09   0.929    -60.33455    
66.08717
     
-------------+----------------------------------------------------------------
          /ln_sig |  -1.102429   .0170846   -64.53   0.000    -1.135914   
-1.068944
     
-------------+----------------------------------------------------------------
            sigma |   .3320636   .0056732                      .3211284    
.3433711
     
------------------------------------------------------------------------------

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