novak_weibull {iadf}

novak_weibull

Description

Fit a Weibull function for the calculation of age corrected IADF frequencies according to Novak et al. (2013).

Usage

novak_weibull(
  novak_freq_object,
  min.n = 15,
  start = NULL,
  max.iter = 500,
  make.plot = TRUE,
  ...
)

Arguments

novak_freq_object

A novak_freq_object as obtained from novak_freq

min.n

minimum number of samples within each cambial age to be included in model estimation

start

set custom start values - default to list(a = 4, b = 0.33, c = 15.5)

max.iter

maximum iterations for internally used nls

make.plot

logical

...

additional plotting arguments

Value

a model object of class "nls"

References

Novak, Klemen and Sánchez, Miguel Angel Saz and Čufar, Katarina and Raventós, Josep and de Luis, Martin. Age, climate and intra-annual density fluctuations in in Spain, IAWA Journal, 34, 459-474 (2013), doi:10.1163/22941932-00000037

See Also

novak_freq, novak_index

Examples

data('example_iadf')
model <- novak_weibull(novak_freq(example_iadf), 15)
novak_index(example_iadf, model)