condroz {robustbase} | R Documentation

## Condroz Data

### Description

Dataset with pH-value and Calcium content in soil samples, collected in different communities of the Condroz region in Belgium. The data pertain to a subset of 428 samples with a pH-value between 7.0 and 7.5.

### Usage

    data(condroz)

### Format

A data frame with 428 observations on the following 2 variables.

`Ca`

  Calcium content of the soil sample

`pH`

  pH value of the soil sample

### Details

For more information on the dataset, cf. Goegebeur et al. (2005).

### Source

Hubert and Vandervieren (2006), p. 10. This dataset is also studied in Vandewalle et al. (2004).

### References

See also those for `adjbox`.

Goegebeur, Y., Planchon, V., Beirlant, J., Oger, R. (2005). Quality Assesment of Pedochemical Data Using Extreme Value Methodology, Journal of Applied Science, 5, p. 1092-1102.

Vandewalle, B., Beirlant, J., Hubert, M. (2004). A robust estimator of the tail index based on an exponential regression model, in Hubert, M., Pison G., Struyf, A. and S. Van Aelst, ed., Theory and Applications of Recent Robust Methods, Birkhäuser, Basel, p. 367-376.

### Examples

      adjbox(condroz$Ca)

[Package robustbase version 0.92-8 Index]