iadf (version 0.1.3)

novak_weibull: 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,
  ...
)

Value

a model object of class "nls"

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

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)