. di "racd5p3.do for Cameron and Trivedi RACD chapter 5"
racd5p3.do for Cameron and Trivedi RACD chapter 5

. 
. 
. 
. ********** READ DATA
. infile docno weeks numbids takeover bidprem insthold size leglrest /*
>     */ realrest finrest regulatn whtknght sizesq constant using racd5.asc
(126 observations read)

. 
. 
. ********** DATA TRANSFORMATIONS
. 
. 
. ******** CHECK DATA: DESCRIPTIVE STATISTICS
. describe

Contains data
  obs:           126                          
 vars:            14                          
 size:         7,560 (99.2% of memory free)
-------------------------------------------------------------------------------
   1. docno     float  %9.0g                  
   2. weeks     float  %9.0g                  
   3. numbids   float  %9.0g                  
   4. takeover  float  %9.0g                  
   5. bidprem   float  %9.0g                  
   6. insthold  float  %9.0g                  
   7. size      float  %9.0g                  
   8. leglrest  float  %9.0g                  
   9. realrest  float  %9.0g                  
  10. finrest   float  %9.0g                  
  11. regulatn  float  %9.0g                  
  12. whtknght  float  %9.0g                  
  13. sizesq    float  %9.0g                  
  14. constant  float  %9.0g                  
-------------------------------------------------------------------------------
Sorted by:  
     Note:  dataset has changed since last saved

. summarize

Variable |     Obs        Mean   Std. Dev.       Min        Max
---------+-----------------------------------------------------
   docno |     126    82174.41   2251.783      78001      85059  
   weeks |     126    11.44898   7.711424      2.857     41.429  
 numbids |     126    1.738095   1.432081          0         10  
takeover |     126           1          0          1          1  
 bidprem |     126    1.346806    .189325    .942675   2.066366  
insthold |     126    .2518175   .1856136          0       .904  
    size |     126    1.219031   3.096624    .017722     22.169  
leglrest |     126    .4285714   .4968472          0          1  
realrest |     126    .1825397   .3878308          0          1  
 finrest |     126    .1031746   .3054011          0          1  
regulatn |     126    .2698413   .4456492          0          1  
whtknght |     126    .5952381   .4928054          0          1  
  sizesq |     126    10.99902   59.91479    .000314   491.4646  
constant |     126           1          0          1          1  

. 
. *** POISSON REGRESSION 
. poisson numbids leglrest realrest finrest whtknght /*
>     */  bidprem insthold size sizesq regulatn

Iteration 0:   log likelihood =  -184.9518  
Iteration 1:   log likelihood = -184.94833  
Iteration 2:   log likelihood = -184.94833  

Poisson regression                                Number of obs   =        126
                                                  LR chi2(9)      =      33.25
                                                  Prob > chi2     =     0.0001
Log likelihood = -184.94833                       Pseudo R2       =     0.0825

------------------------------------------------------------------------------
 numbids |      Coef.   Std. Err.       z     P>|z|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
leglrest |   .2601464   .1509594      1.723   0.085      -.0357286    .5560213
realrest |  -.1956597   .1926309     -1.016   0.310      -.5732093    .1818899
 finrest |   .0740301   .2165219      0.342   0.732      -.3503452    .4984053
whtknght |   .4813822   .1588698      3.030   0.002        .170003    .7927613
 bidprem |  -.6776958   .3767372     -1.799   0.072      -1.416087    .0606956
insthold |  -.3619912   .4243292     -0.853   0.394      -1.193661    .4696788
    size |   .1785026   .0600221      2.974   0.003       .0608614    .2961438
  sizesq |  -.0075693   .0031217     -2.425   0.015      -.0136878   -.0014509
regulatn |  -.0294392   .1605682     -0.183   0.855       -.344147    .2852686
   _cons |   .9860598   .5339201      1.847   0.065      -.0604044    2.032524
------------------------------------------------------------------------------

. * This gives ML standard errors which are incorrect
. 
. ********** CLOSE OUTPUT
. log close