cassav {rchemo}

cassav

Description

A NIRS dataset (absorbance) describing the concentration of a natural pigment in samples of tropical shrubs. Spectra were recorded from 400 to 2498 nm at 2 nm intervals.

Usage

data(cassav)

Format

A list with the following components:

For the reference (calibration) data:

Xtrain

A matrix whose rows are the NIR absorbance spectra (= log10(1 / Reflectance)).

ytrain

A vector of the response variable (pigment concentration).

year

A vector of the year of data collection (2009 to 2012; the test set correponds to year 2013).

For the test data:

Xtest

A matrix whose rows are the NIR absorbance spectra (= log10(1 / Reflectance)).

ytest

A vector of the response variable (pigment concentration).

References

Davrieux, F., Dufour, D., Dardenne, P., Belalcazar, J., Pizarro, M., Luna, J., Londono, L., Jaramillo, A., Sanchez, T., Morante, N., Calle, F., Becerra Lopez-Lavalle, L., Ceballos, H., 2016. LOCAL regression algorithm improves near infrared spectroscopy predictions when the target constituent evolves in breeding populations. Journal of Near Infrared Spectroscopy 24, 109. https://doi.org/10.1255/jnirs.1213

CIAT Cassava Project (Colombia), CIRAD Qualisud Research Unit, and funded mainly by the CGIAR Research Program on Roots, Tubers and Bananas (RTB) with support from CGIAR Trust Fund contributors (https://www.cgiar.org/funders/).

Examples

data(cassav)
str(cassav)