test.l: Test a vector of weight transformation limits for mximum...

In EMMAgeo: End-Member Modelling of Grain-Size Data

Test a vector of weight transformation limits for mximum value.

Description

This function performs the weight transformation of the data matrix after Klovan & Imbrie (1971) and performs EMMA() with different weight limits to check if valied results are yielded. It returns the maximum value for which the transformation remains stable.

Usage

test.l(X, l, ...)

Arguments

X	Numeric matrix, input data set with m samples (rows) and n variables (columns).
l	Numeric vector, weight transformation limit, i.e. quantile; default is 0.
...	Further arguments passed to the function.

Value

List with objects

step	Numeric scalar with position of the last valid value.
l.max	Numeric scalar with last valid value of l.

Author(s)

Michael Dietze, Elisabeth Dietze

References

Dietze E, Hartmann K, Diekmann B, IJmker J, Lehmkuhl F, Opitz S, Stauch G, Wuennemann B, Borchers A. 2012. An end-member algorithm for deciphering modern detrital processes from lake sediments of Lake Donggi Cona, NE Tibetan Plateau, China. Sedimentary Geology 243-244: 169-180.
Klovan JE, Imbrie J. 1971. An Algorithm and FORTRAN-IV Program for Large-Scale Q-Mode Factor Analysis and Calculation of Factor Scores. Mathematical Geology 3: 61-77.

See Also

EMMA, check.data, test.parameters

Examples

## load example data set
data(example_X)

test <- test.l(X = X, l = seq(from = 0, to = 0.6, by = 0.1))

EMMAgeo documentation built on April 3, 2025, 10:24 p.m.