calc_FuchsLang2001: Apply the model after Fuchs & Lang (2001) to a given De...

In Luminescence: Comprehensive Luminescence Dating Data Analysis

Apply the model after Fuchs & Lang (2001) to a given De distribution.

Description

This function applies the method according to Fuchs & Lang (2001) for heterogeneously bleached samples with a given coefficient of variation threshold.

Usage

calc_FuchsLang2001(data, cvThreshold = 5, startDeValue = 1, plot = TRUE, ...)

Arguments

data	RLum.Results or data.frame (required): for data.frame: two columns with De (data[,1]) and De error (values[,2])
cvThreshold	numeric (with default): coefficient of variation in percent, as threshold for the method, e.g. cvThreshold = 3. See details .
startDeValue	numeric (with default): number of the first aliquot that is used for the calculations
plot	logical (with default): plot output TRUE/FALSE
...	further arguments and graphical parameters passed to plot

Details

Used values

If the coefficient of variation (c[v]) of the first two values is larger than the threshold c[v_threshold], the first value is skipped. Use the startDeValue argument to define a start value for calculation (e.g. 2nd or 3rd value).

Basic steps of the approach

1. Estimate natural relative variation of the sample using a dose recovery test

2. Sort the input values ascendantly

3. Calculate a running mean, starting with the lowermost two values and add values iteratively.

4. Stop if the calculated c[v] exceeds the specified cvThreshold

Value

Returns a plot (optional) and terminal output. In addition an RLum.Results object is returned containing the following elements:

summary	data.frame summary of all relevant model results.
data	data.frame original input data
args	list used arguments
call	call the function call
usedDeValues	data.frame containing the used values for the calculation

Function version

0.4.1

How to cite

Kreutzer, S., Burow, C., 2024. calc_FuchsLang2001(): Apply the model after Fuchs & Lang (2001) to a given De distribution.. Function version 0.4.1. In: Kreutzer, S., Burow, C., Dietze, M., Fuchs, M.C., Schmidt, C., Fischer, M., Friedrich, J., Mercier, N., Philippe, A., Riedesel, S., Autzen, M., Mittelstrass, D., Gray, H.J., Galharret, J., 2024. Luminescence: Comprehensive Luminescence Dating Data Analysis. R package version 0.9.24. https://CRAN.R-project.org/package=Luminescence

Note

Please consider the requirements and the constraints of this method (see Fuchs & Lang, 2001)

Author(s)

Sebastian Kreutzer, Institute of Geography, Heidelberg University (Germany)
Christoph Burow, University of Cologne (Germany) , RLum Developer Team

References

Fuchs, M. & Lang, A., 2001. OSL dating of coarse-grain fluvial quartz using single-aliquot protocols on sediments from NE Peloponnese, Greece. In: Quaternary Science Reviews 20, 783-787.

Fuchs, M. & Wagner, G.A., 2003. Recognition of insufficient bleaching by small aliquots of quartz for reconstructing soil erosion in Greece. Quaternary Science Reviews 22, 1161-1167.

See Also

plot, calc_MinDose, calc_FiniteMixture, calc_CentralDose, calc_CommonDose, RLum.Results

Examples

## load example data
data(ExampleData.DeValues, envir = environment())

## calculate De according to Fuchs & Lang (2001)
temp<- calc_FuchsLang2001(ExampleData.DeValues$BT998, cvThreshold = 5)

Luminescence documentation built on June 22, 2024, 9:54 a.m.