Source: LV01p08.sas    5/7/01     Ed Stanek
Table 1a.  List of subject and exposure

              Age        Person
               in         Years       Latency
             1978:    expos. 1942:     period
Obs    id    AGE78        EXP1          LAT1

  1     1      47           0            0
  2     2       9           0            0
  3     3       9           0            0
  4     4      33           3            0
  5     5      55           1            0
  6     6      64           1            0
  7     7      15           0            0
  8     8      42           0            0
  9     9      21           0            0
 10    10      47           0            0
 11    11      48           0            0
 12    12      26           0            0
 13    13      50           1            0
 14    14      18           0            0
 15    15      48           0            0
 16    16      27           1            0
 17    17      77           1            0
 18    18      47           1            0
 19    19      27           0            0
 20    20      26           0            0






















































































































Based on LV01p08.sas
Source: LV01p08.sas    5/7/01     Ed Stanek
Table 1b.  List of exposure freq distribution in person years

The FREQ Procedure

              Person*Years*expos. 1942:*EXP1

                                 Cumulative    Cumulative
exp1    Frequency     Percent     Frequency      Percent
---------------------------------------------------------
   0         493       51.84           493        51.84
   1         261       27.44           754        79.28
   2         130       13.67           884        92.95
   3          51        5.36           935        98.32
   4          13        1.37           948        99.68
   5           3        0.32           951       100.00


































































































































Based on LV01p08.sas
Source: LV01p08.sas    5/7/01     Ed Stanek
Figure 2.  Example of Cox Proportional Hazards Model
  age mean=40 std=20 Latency=0  Effect of exposure=1
       # subjects=1000  Exposure Mean=Poisson(1)   *  PROC PRINT DATA=pred1

The PHREG Procedure

                       Model Information

Data Set                 WORK.D1
Entry Time Variable      age78        Age*in*1978:*AGE78
Dependent Variable       survt        Survival*Yrs:*SURVT
Censoring Variable       censor       Right*censor*time:*CENSOR
Censoring Value(s)       1
Ties Handling            BRESLOW


Summary of the Number of Event and Censored Values

                                     Percent
   Total       Event    Censored    Censored

     845         174         671       79.41


                       Convergence Status

         Convergence criterion (GCONV=1E-8) satisfied.


         Model Fit Statistics

                 Without           With
Criterion     Covariates     Covariates

-2 LOG L        1666.465       1646.173
AIC             1666.465       1648.173
SBC             1666.465       1651.332


        Testing Global Null Hypothesis: BETA=0

Test                 Chi-Square       DF     Pr > ChiSq

Likelihood Ratio        20.2918        1         <.0001
Score                   22.5052        1         <.0001
Wald                    22.0837        1         <.0001


                                  Analysis of Maximum Likelihood Estimates

                   Parameter      Standard                                  Hazard
Variable    DF      Estimate         Error    Chi-Square    Pr > ChiSq       Ratio    Variable Label

exp1         1       0.35966       0.07653       22.0837        <.0001       1.433    Total yrs*exposed:*EXP1



























































































Based on LV01p08.sas