Education Expenditure Data, from Chatterjee and Price (1977, p.108). This data set, representing the education expenditure variables in the 50 US states, provides an interesting example of heteroscedacity.
Usage
data(education)
Arguments
source
P. J. Rousseeuw and A. M. Leroy (1987)
Robust Regression and Outlier Detection. Wiley, p.110, table 16.