farms {MASS} | R Documentation

## Ecological Factors in Farm Management

### Description

The `farms` data frame has 20 rows and 4 columns. The rows are farms on the Dutch island of Terschelling and the columns are factors describing the management of grassland.

### Usage

    data(farms)

### Format

This data frame contains the following columns:

`Mois`
  Five levels of soil moisture – level 3 does not occur at these 20 farms.
`Manag`
  Grassland management type (`SF` = standard, `BF` = biological, `HF` = hobby farming, `NM` = nature conservation).
`Use`
  Grassland use (`U1` = hay production, `U2` = intermediate, `U3` = grazing)
`Manure`
  Manure usage – classes `C0` to `C4`.

### Source

J.C. Gower and D.J. Hand (1996) Biplots. Chapman & Hall, Table 4.6.

Quoted as from:
R.H.G. Jongman, C.J.F. ter Braak and O.F.R. van Tongeren (1987) Data Analysis in Community and Landscape Ecology. PUDOC, Wageningen

### References

Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.

### Examples

    farms.mca <- mca(farms, abbrev = TRUE)  # Use levels as names
    eqscplot(farms.mca$cs, type = "n")
    text(farms.mca$rs, cex = 0.7)
    text(farms.mca$cs, labels = dimnames(farms.mca$cs)[[1]], cex = 0.7)

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