Description Usage Value Source Examples

The Boston data frame has 506 rows and 14 columns.

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This data frame contains the following columns:

- lcrim
Natural logarithm of the 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.

- disf
A numerical vector representing an ordered categorical variable with four levels depending on the weighted mean of the distances to five Boston employment centres (=1 if distance < 2.5, =2 if 2.5 <= distance < 5, =3 if 5 <= distance < 7.5, =4 if distance >= 7.5).

- rad
Index of accessibility to radial highways.

- tax
Full-value property-tax rate per $10,000.

- pratio
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
Median value of owner-occupied homes in $1000s.

Harrison, D. and Rubinfeld, D.L. (1978) Hedonic prices and the demand for
clean air. *J. Environ. Economics and Management* **5**, 81–102.

Belsley D.A., Kuh, E. and Welsch, R.E. (1980) *Regression Diagnostics.*
*Identifying Influential Data and Sources of Collinearity.* New York:
Wiley.

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