fossil {aspline}

Fossil data

Description

A dataset with 106 observations on fossil shells from the SemiPar package (https://CRAN.R-project.org/package=SemiPar).

Usage

fossil

Format

A data frame with 106 observations and 2 variables:

age

The age of fossils, in millions of years

strontium.ratio

Ratio of strontium isotopes

...

Source

Bralower, T.T, 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.