A data set from the MLC++ machine learning software for modeling customer
churn. There are 19 predictors, mostly numeric: state
(categorical),
account_length
area_code
international_plan
(yes/no),
voice_mail_plan
(yes/no), number_vmail_messages
total_day_minutes
total_day_calls
total_day_charge
total_eve_minutes
total_eve_calls
total_eve_charge
total_night_minutes
total_night_calls
total_night_charge
total_intl_minutes
total_intl_calls
total_intl_charge
, and
number_customer_service_calls
.