Ragweed data

Description

The ragweed data frame has data on ragweed levels and meteorological variables for 335 days in Kalamazoo, Michigan, U.S.A.

Usage

data(ragweed)

Format

This data frame contains the following columns:

ragweed

ragweed level (grains per cubic metre).

year

one of 1991, 1992, 1993 or 1994.

day.in.seas

day number in the current ragweed pollen season.

temperature

temperature of following day (degrees Fahrenheit).

rain

indicator of significant rain the following day: 1=at least 3 hours of steady or brief but intense rain, 0=otherwise.

wind.speed

wind speed forecast for following day (knots).

Source

Stark, P. C., Ryan, L. M., McDonald, J. L. and Burge, H. A. (1997). Using meteorologic data to model and predict daily ragweed pollen levels. Aerobiologia, 13, 177-184.

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(ragweed)
pairs(ragweed,pch=".")