This data set gives the abundance of 32 mollusk species in 163 samples. For each sample, 4 additional covariates are known.
molluskA list with 2 two data frames:
a 163 x 32 data frame of abundancies/counts (163 samples and 32 mollusk species)
a 163 x 4 data frame of covariates:
a factor with 8 levels indicating the sampling site
a factor with 4 levels indicating the season
a factor with 2 levels for the method of sampling - wood or string
a numeric with 3 levels for the time of exposure in week
In order to prepare the data for using formula in multivariate analysis (multiple outputs and inputs), use prepare_data().
Original data set has been extracted from ade4.
Data from Richardot-Coulet, Chessel and Bournaud.
Richardot-Coulet, M., Chessel D. and Bournaud M. (1986) Typological value of the benthos of old beds of a large river. Methodological approach. Archiv fùr Hydrobiologie, 107, 363–383.
data(mollusk)
mollusc <- prepare_data(mollusk$Abundance, mollusk$Covariate)
#> Warning: ! There is at least one empty sample in `counts`.
#> ℹ <4> samples (<134/137/145/146>) in `counts` have been dropped for lack of
#> positive counts.