1. card::geh
    GEH parameters in a large clinical cohort
  2. card::hrv
    Output from MATLAB HRV Toolbox
  3. card::stress
    Recurrent event sample data
  4. card::triplets
    Hourly time series data with clinical covariates
  5. card::twins
    Hourly time series data with clinical covariates
  6. card::zipcode
    Zipcodes with Associated Latitude and Longitude