# R Dataset / Package robustbase / condroz

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## Visual Summaries

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<iframe src="https://embed.picostat.com/r-dataset-package-robustbase-condroz.html" frameBorder="0" width="100%" height="307px" />
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Dataset Help

On this Picostat.com statistics page, you will find information about the condroz data set which pertains to Condroz Data . The condroz data set is found in the robustbase R package. You can load the condroz data set in R by issuing the following command at the console data("condroz"). This will load the data into a variable called condroz. If R says the condroz data set is not found, you can try installing the package by issuing this command install.packages("robustbase") and then attempt to reload the data. If you need to download R, you can go to the R project website. You can download a CSV (comma separated values) version of the condroz R data set. The size of this file is about 3,394 bytes.

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

### 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)

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Dataset imported from https://www.r-project.org.

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