fossil {SemiPar}

Fossil data

Description

The fossil data frame has 106 observations on fossil shells.

Usage

data(fossil)

Format

This data frame contains the following columns:

age

age in millions of years

strontium.ratio

ratios of strontium isotopes

Source

Bralower, T.J., Fullagar, P.D., Paull, C.K., Dwyer, G.S. and Leckie, R.M. (1997). Mid-cretaceous strontium-isotope stratigraphy of deep-sea sections. Geological Society of America Bulletin, 109, 1421-1442.

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(fossil)
attach(fossil)
plot(age,strontium.ratio)