ichtyo {ade4} | R Documentation

## Point sampling of fish community

### Description

This data set gives informations between a faunistic array, the total number of sampling points made at each sampling occasion and the year of the sampling occasion.

### Usage

    data(ichtyo)

### Format

`ichtyo` is a list of 3 components.

tab
  is a faunistic array with 9 columns and 32 rows.
eff
  is a vector of the 32 sampling effort.
dat
  is a factor where the levels are the 10 years of the sampling occasion.

### Details

The value n(i,j) at the ith row and the jth column in `tab` corresponds to the number of sampling points of the ith sampling occasion (in `eff`) that contains the jth species.

### Source

Dolédec, S., Chessel, D. and Olivier, J. M. (1995) L'analyse des correspondances décentrée: application aux peuplements ichtyologiques du haut-Rhône. Bulletin Français de la Pêche et de la Pisciculture, 336, 29–40.

### Examples

    data(ichtyo)
    dudi1 <- dudi.dec(ichtyo$tab, ichtyo$eff, scan = FALSE)
    s.class(dudi1$li, ichtyo$dat, wt = ichtyo$eff / sum(ichtyo$eff))

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