proxyA {ClamR}R Documentation

Optimum Wilkinson Curve Fitting

Description

Runs one cycle of optimum Wilkinson curve fitting for a single sinusoid fitting.

Usage

proxyA(ax, ay, xin)

Arguments

ax

x-axis values

ay

y-axis values

xin

starting model: c( Phs,Pos,Amp,Prd)

Details

This program implements the Wilkinson and ivany approach to climate time series modeling. This is used in the more sophisticated proxyJK code.

Value

Optimum model, vector of 4 values

Note

Uses stats package routine optim for optimization

Author(s)

Jonathan M. Lees<jonathan.lees@unc.edu>

References

Wang, T., Surge, D., and Lees, J. M., (2015) ClamR: A Statistical Evaluation of Isotopic and Temperature Records in Sclerochronologic Studies. Palaeogeography, Palaeoclimatology, Palaeoecology, doi:10.1016/j.palaeo.2015.07.008.\

Wilkinson, B. H. and Ivany, L. C., Paleoclimatic inference from stable isotope profiles of accretionary biogenic hardparts; a quantitative approach to the evaluation of incomplete data, Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 185, no. 1-2, pp.95-114, 01 Sep 2002

See Also

proxyJK

Examples

data(CLAM1)
x = CLAM1$x
y = CLAM1$y

dx = 3.392

Aout = proxyA(x, y, dx)



[Package ClamR version 2.1-1 Index]