calc_gSGC: Calculate De value based on the gSGC by Li et al., 2015

In R-Lum/Luminescence: Comprehensive Luminescence Dating Data Analysis

Calculate De value based on the gSGC by Li et al., 2015

Description

The function computes De value and De value error using the global standardised growth curve (gSGC) assumption proposed by Li et al., 2015 for OSL dating of sedimentary quartz.

Usage

calc_gSGC(
  data,
  gSGC.type = "0-250",
  gSGC.parameters,
  n.MC = 100,
  verbose = TRUE,
  plot = TRUE,
  ...
)

Arguments

data	data.frame (required): input data the following columns five columns in the given order: LnTn, LnTn.error, Lr1Tr1, Lr1Tr1.error, Dr1. Column names are not required.
gSGC.type	character (with default): function parameters to use for the iteration procedure, either "0-450" or "0-250", as presented in Li et al., 2015 (Table 2). This is ignored if gSGC.parameters is set.
gSGC.parameters	list (optional): option to provide own function parameters used for fitting as named list. Nomenclature follows Li et al., 2015, i.e. list(A, A.error, D0, D0.error, c, c.error, Y0, Y0.error, range), where range is defines the interval where the function is considered as valid, e.g. range = c(0,250). If set, option gSGC.type will be ignored.
n.MC	integer (with default): number of Monte Carlo simulation runs for error estimation, see details.
verbose	logical (with default): enable/disable output to the terminal.
plot	logical (with default): enable/disable the plot output.
...	parameters will be passed to the plot output

Details

The error of the De value is determined using a Monte Carlo simulation approach. Solving of the equation is realised using uniroot. Large values for n.MC will significantly increase the computation time.

Value

Returns an S4 object of type RLum.Results.

⁠@data⁠
⁠$ De.value⁠ (data.frame)
.. $ De
.. $ De.error
.. $ Eta
⁠$ De.MC⁠ (list) contains the matrices from the error estimation.
⁠$ uniroot⁠ (list) contains the uniroot outputs of the De estimations

⁠@info⁠
'$ call“ (call) the original function call

Function version

0.1.2

Author(s)

Sebastian Kreutzer, Institute of Geography, Heidelberg University (Germany)

References

Li, B., Roberts, R.G., Jacobs, Z., Li, S.-H., 2015. Potential of establishing a 'global standardised growth curve' (gSGC) for optical dating of quartz from sediments. Quaternary Geochronology 27, 94-104. doi:10.1016/j.quageo.2015.02.011

See Also

RLum.Results, get_RLum, uniroot

Examples

results <- calc_gSGC(data = data.frame(
LnTn =  2.361, LnTn.error = 0.087,
Lr1Tr1 = 2.744, Lr1Tr1.error = 0.091,
Dr1 = 34.4))

get_RLum(results, data.object = "De")

R-Lum/Luminescence documentation built on June 9, 2025, 2:40 p.m.