---
data_dictionary: whas500.dat

description:
  The data represents survival times for a 500 patient 
  subset of data from the Worcester Heart Attack
  Study. You can find more information about this
  data set in Chapter 1 of Hosmer, Lemeshow, and
  May.

source: 
  This data set is very similar to whas100. It is a
  larger subset with more variables. For a 
  description of the context of this file and where
  you can find it, please refer to 
  data-dictionary-whas100.yaml.

download_url:
  text-format: ftp://ftp.wiley.com/public/sci_tech_med/survival/
  sas-format: https://stats.idre.ucla.edu/wp-content/uploads/2016/02/asa2_sas.zip
  spss-format: https://stats.idre.ucla.edu/wp-content/uploads/2016/02/asa2_spss.zip

copyright: 
  There is no explicit license for when and how you
  can use this data, but it is presented here under
  the Fair Use provisions of U.S. Copyright law.

format: 
  space-delimited
  
varnames: 
  first row of data
  
missing_value_code: 
  Not needed

size:
  rows: 500
  columns: 22

vars:
  id: 
    label: a sequential code from 1 to 100

  age:
    scale: ratio
    label: Age at Admission
    unit: years

  gender:
    scale: binary
    value:
      Male: 0
      Female: 1

  hr:
    scale: ratio
    label: Initial Heart Rate
    unit: Beats per minute

  sysbp:
    scale: ratio
    label: Initial Systolic Blood Pressure
    unit: mmHg

  diasbp:
    scale: ratio
    label: Initial Diastolic Blood Pressure
    unit: mmHg

  bmi:
    scale: ratio
    label: Body Mass Index
    unit: kg/m^2

  cvd:
    scale: binary
    label: History of Cardiovascular Disease
    value:
      No: 0
      Yes: 1

  afb:
    scale: binary
    label: Atrial Fibrillation
    value:
      No: 0
      Yes: 1

  sho:
    scale: binary
    label: Cardiogenic Shock
    value:
      No: 0
      Yes: 1

  chf:
    scale: binary
    label: Congestive Heart Complications
    value:
      No: 0
      Yes: 1

  av3:
    scale: binary
    label: Complete Heart Block
    value:
      No: 0
      Yes: 1

  miord:
    scale: binary
    label: MI Order
    value:
      First: 0
      Recurrent: 1

  mitype:
    scale: binary
    label: MI Type
    value:
      non Q-wave: 0
      Q-wave: 1

  year:
    scale: ordinal
    label: Cohort Year
    value:
      yr1997: 1
      yr1999: 2
      yr2001: 3

  admitdate:
    label: Admission Date
    format: mm/dd/yyyy

  disdate:
    label: Hospital Discharge Date
    format: mm/dd/yyyy

  fdate:
    label: Date of last Follow Up
    format: mm/dd/yyyy

  los:
    scale: ratio
    label: Length of Hospital Stay
    unit: Days

  dstat:
    scale: binary
    label: Discharge Status from Hospital
    value:
      Alive: 0
      Dead: 1

  lenfol: 
    scale: ratio
    label: Follow Up Time
    unit: days

  fstat: 
    scale: binary
    label: Vital Satus
    value:
      Alive: 0
      Dead: 1

---