doubs {ade4} | R Documentation

## Pair of Ecological Tables

### Description

This data set gives environmental variables, fish species and spatial coordinates for 30 sites.

### Usage

    data(doubs)

### Format

`doubs` is a list with 3 components.

mil
  is a data frame with 30 rows (sites) and 11 environmental variables.
poi
  is a data frame with 30 rows (sites) and 27 fish species.
xy
  is a data frame with 30 rows (sites) and 2 spatial coordinates.

### Source

Verneaux, J. (1973) Cours d'eau de Franche-Comté (Massif du Jura). Recherches écologiques sur le réseau hydrographique du Doubs. Essai de biotypologie. Thèse d'état, Besançon. 1–257.

### Examples

    data(doubs)
    pca1 <- dudi.pca(doubs$mil, scan = FALSE)
    pca2 <- dudi.pca(doubs$poi, scale = FALSE, scan = FALSE)
    coiner1 <- coinertia(pca1, pca2, scan = FALSE)
    par(mfrow = c(3,3))
    s.corcircle(coiner1$aX)
    s.value(doubs$xy, coiner1$lX[,1])
    s.value(doubs$xy, coiner1$lX[,2])
    s.arrow(coiner1$c1)
    s.match(coiner1$mX, coiner1$mY)
    s.corcircle(coiner1$aY)
    s.arrow(coiner1$l1)
    s.value(doubs$xy, coiner1$lY[,1])
    s.value(doubs$xy, coiner1$lY[,2])
    par(mfrow = c(1,1))

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