ade4 (version 1.01)

ichtyo: 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.

1. 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.}

source

Dol�dec, S., Chessel, D. and Olivier, J. M. (1995) L'analyse des correspondances d�centr�e: application aux peuplements ichtyologiques du haut-Rh�ne. Bulletin Fran�ais de la P"che et de la Pisciculture, 336, 29--40.

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.

Examples

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