Feature Description crim per capita crime rate by town. zn proportion of residential land zoned for lots over 25,000 sq.ft. indus proportion of non-retail business acres per town. chas Charles River dummy variable (= 1 if tract bounds river; 0 otherwise). nox nitrogen oxides concentration (parts per 10 million). rm average number of rooms per dwelling. age proportion of owner-occupied units built prior to 1940. dis weighted mean of distances to five Boston employment centers. rad index of accessibility to radial highways. tax full-value property-tax rate per $10,000. ptratio pupil-teacher ratio by town. black 1000(Bk - 0.63)^2 where Bk is the proportion of blacks by town. lstat lower status of the population (percent). medv (Target) median value of owner-occupied homes in $1000s.