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, scannf = FALSE)
s.class(dudi1$li, ichtyo$dat, wt = ichtyo$eff / sum(ichtyo$eff))
[Package ade4 version 1.7-22 Index]