Format
The data set contains the following variables: bmi - body mass index, calculated by weight(kg)/height(cm)^2, numeric age - children's age in years at the time of survey, numeric sex - sex of the children, factor race - race of the children, factor numpeople - number of people in family, numeric car - the number of cars in family, numeric gotosch - the method used to go to school, factor snack - eat snack or not in a day, binary tvhours - number of hours watching TV per week, numeric cmpthours - number of hours using computer per week, numeric cellhours - number of hours playing with cell phones per week, numeric sports - join in a sport team or not, 1: yes; and 2: no exercises - number of hours of exercises per week, numeric sweat - number of hours of sweating activities per week, numeric overweigh - the child is overweighed or not, binary