Per-capita crime rate by town
Proportion of residential land zoned for lots over 25,000 sq
Proportion of non retail business acres per town
Charles River dummy variable (1 if tract bounds river; 0 otherwise)
Nitric oxides concentration (parts per 10 million)
Average number of rooms per dwelling
Proportion of owner-occupied units built prior to 1940
Weighted distances to five Boston employment centres
Index of accessibility to radial highways
Full-value property-tax rate per $10,000
Pupil-teacher ratio by town
1000(Bk - 0.63)^2 where Bk is the proportion of blacks by town
Percentage lower status of the population
Median value owner-occupied homes in $1000's