EMMAgeo (version 0.9.1)

test.lw: Function to test maximum valid lw 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.lw(X, lw)

Arguments

X

Numeric matrix with m samples (rows) and n variables (columns).

lw

Numeric vector specifying the weight transformation limit, i.e. quantile; default is 0.

Value

• A list with objects
• step
  Numeric scalar with position of last valid value.
• lw.max
  Numeric scalar with last valid value of lw.

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(X.artificial, envir = environment())

## create weight transformation limits vector
lw <- seq(from = 0, to = 0.6, by = 0.02)

## test the vector
test.lw(X = X.artificial, lw = lw)