A sample of 900 Californian households#'
A dataframe containing:
- idcase: id, - depvar: heating system, one of gc (gas central), gr (gas room), ec (electric central), er (electric room), hp (heat pump), - ic.z: installation cost for heating system z (defined for the 5 heating systems), - oc.z: annual operating cost for heating system z (defined for the 5 heating systems), - pb.z: ratio oc.z/ic.z , - income: annual income of the household, - agehed: age of the household head - rooms: numbers of rooms in the house,