|    14. MEDV     Median value of owner-occupied homes in $1000's
low,medlow,medhigh,high

CRIM:	continuous	|per capita crime rate by town
ZN:		continuous	|proportion of residential land zoned for lots over 25,000 sq.ft.
INDUS:	continuous	|proportion of non-retail business acres per town
CHAS:	continuous	|Charles River dummy variable (= 1 if tract bounds river; 0 otherwise)
NOX:	continuous	|nitric oxides concentration (parts per 10 million)
RM:		continuous	|average number of rooms per dwelling
AGE:	continuous	|proportion of owner-occupied units built prior to 1940
DIS:	continuous	|weighted distances to five Boston employment centres
RAD:	continuous	|index of accessibility to radial highways
TAX:	continuous	|full-value property-tax rate per $10,000
PTRATIO: continuous	|pupil-teacher ratio by town
B:		continuous	|1000(Bk - 0.63)^2 where Bk is the proportion of blacks by town
LSTAT:  continuous  |lower status of the population