salinity:
Water Salinity and River Discharge
Description
The 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.
Format
This data frame contains the following columns:
sal-
The average salinity of the water over two weeks.
lag-
The average salinity of the water lagged two weeks. Since only spring is used,
the value of
lag is not always equal to the previous value of sal.
trend-
A factor indicating in which of the 6 biweekly periods between March and May,
the observations were taken. The levels of the factor are from 0 to 5 with
0 being the first two weeks in March.
dis-
The amount of river discharge during the two weeks for which
sal is the
average salinity.
Source
The data were obtained from 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
Davison, A.C. and Hinkley, D.V. (1997)
Bootstrap Methods and Their Application. Cambridge University Press.