phosphorus {GLMsData}

Soil phosphorus

Description

The amount of phosphorus in soil samples

Usage

data(phosphorus)

Format

A data frame with 18 observations on the following 4 variables.

Sample

an identifier, the sample ID; a numeric vector

Inorg

the amount of inorganic phosphorus chemically determined in ppm (parts per million); a numeric vector

Org

the amount of organic phosphorus chemically determined in ppm; a numeric vector

PA

the amount of plant-available phosphorus of corn grown in the soil in ppm; a numeric vector

Details

Chemical determinations of the phosphorus in the soil at 18 locations in Iowa were determined, including the amount of available phosphorus for growing corn at 20 degrees C.

Source

S. M. Snappin and R. D. Small (1986) Tests of significance using regression models for ordered categorical data. Biometrics, 42, 583–592.

References

D. J. Hand, F. Daly, A. D. Lunn, K. J. McConway, and E. Ostrowski (1994) A Handbook of Small Data Sets, London: Chapman and Hall. Dataset 237.

Examples

data(phosphorus)
summary(phosphorus)