Dris {mffSM}R Documentation

Data on chemical composition of solids of grain leafs

Description

Data on chemical composition of solids in 368 grain leafs obtained during the growing season and later identified grain yields.

Data are used for some illustrations in the book Regrese by Karel Zvára (Zvára, 2008). Originally, data were obtained thanks to a generous kindness of prof. Lubomír Nátr (Faculty of Science, Charles University in Prague). DRIS stands for Diagnosis and Recommendation Integrated System.

Usage

data(Dris)

Format

A data.frame with 368 rows and the following variables.

yield

yield

N

nitrogen content

P

phosphorus content

K

potassium content

Ca

calcium content

Mg

magnesium content

Source

http://msekce.karlin.mff.cuni.cz/~zvara/regrese/kniha/R.ZIP

References

Zvára, K. (2008). Regrese. Praha: Matfyzpress. ISBN 978-80-7378-041-8.

Examples

data(Dris)
summary(Dris)

[Package mffSM version 1.2 Index]