Variable        description  
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 CRIM           crime rate  
 ZN             proportion of residential land zoned for lots over 25,000 sq. ft 
 INDUS          proportion of non-retail business acres 
 CHAS           Charles River dummy variable (=1 if tract bounds river; 0 otherwise) 
 NOX            nitric oxides concentration, pphm 
 RM             average number of rooms per dwelling 
 AGE            proportion of owner-occupied units built prior to 1940 
 DIS            weighted 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 
 B              1000*(Bk-0.63)^2 where Bk is the proportion of blacks
 LSTAT          percent lower status population 
 MEDV           median value of owner occupied homes in $1000's 
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MEDV is the response, all others are predictors.