salinity
data frame has 28 rows and 4 columns.Biweekly averages of the water salinity and river discharge in Pamlico Sound, North Carolina were recorded between the years 1972 and 1977. The data in this set consists only of those measurements in March, April and May.
data(salinity)
Ruppert, D. and Carroll, R.J. (1980) Trimmed least squares estimation in the linear model. Journal of the American Statistical Association, 75, 828--838.