ichtyo {ade4} | R Documentation |
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.
data(ichtyo)
ichtyo
is a list of 3 components.
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.
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.
data(ichtyo) dudi1 <- dudi.dec(ichtyo$tab, ichtyo$eff, scan = FALSE) s.class(dudi1$li, ichtyo$dat, wt = ichtyo$eff / sum(ichtyo$eff))