Salinity data

Description

The salinity data frame has 28 observations on hydrological measurements from Pamlico Sound, North Carolina, USA.

Usage

data(salinity)

Format

This data frame contains the following columns:

salinity

salinity in Pamlico Sound.

lagged.salinity

salinity in Pamlico Sound during the previous six weeks.

trend

trend=1 if the data is the first six-week period of the spring, and so forth. Used to detect possible effects of the seasonal warming trend.

discharge

discharge of fresh water from rivers into the sound.

Source

Ruppert, D, and Carroll, R.J. (1980), Trimmed least squares estimation in the linear model, Journal of the American Statistical Association, 75, 828-838.

References

Ruppert, D., Wand, M.P. and Carroll, R.J. (2003)
Semiparametric Regression Cambridge University Press.
http//stat.tamu.edu/~carroll/semiregbook/

Examples

library(SemiPar)
data(salinity)
pairs(salinity)