Contains data from etzioni\psa2b.dta
  obs:           683                          CARET PSA Biomarker data -
                                                Etzioni substudy
 vars:             6                          21 May 2002 11:19
 size:        15,709 (99.9% of memory free)   (_dta has notes)
-------------------------------------------------------------------------------
              storage  display     value
variable name   type   format      label      variable label
-------------------------------------------------------------------------------
id              int    %8.0g                * patient id
d               byte   %8.0g       ynlbl    * Prostate Ca
t               float  %9.0g                  time (years) relative to
                                                prostate Ca Dx
fpsa            float  %9.0g                  free PSA
tpsa            float  %9.0g                  total PSA
age             float  %9.0g                  patient age at blood draw
                                            * indicated variables have notes
-------------------------------------------------------------------------------
Sorted by:  id  t

**********************
value labels for variables with numeric codes:

ynlbl:
           0 no
           1 yes

*********************
notes:

_dta:
  1.  Data reference: Etzioni R, Pepe M, Longton G, Hu C, and Goodman G.
      Incorporating the time dimension in receiver operating characteristic
      curves: A case study of prostate cancer. Medical Decision Making,
      19(3):242-251, 1999.

id:
  1.  sequential, randomly assigned

d:
  1.  non-cancer patients are controls matched to cases on age and # samples