disc function

Rao's dissimilarity coefficient

Calculates the root square of Rao's dissimilarity coefficient between samples.

disc(samples, dis = NULL, structures = NULL)

Arguments

• samples: a data frame with elements as rows, samples as columns, and abundance, presence-absence or frequencies as entries
• dis: an object of class dist containing distances or dissimilarities among elements. If dis is NULL, equidistances are used.
• structures: a data frame containing, in the jth row and the kth column, the name of the group of level k to which the jth population belongs.

Returns

Returns a list of objects of class dist

References

Rao, C.R. (1982) Diversity and dissimilarity coefficients: a unified approach. Theoretical Population Biology, 21 , 24--43.

Author(s)

Sandrine Pavoine pavoine@mnhn.fr

Examples

data(humDNAm)
humDNA.dist <- disc(humDNAm$samples, sqrt(humDNAm$distances), humDNAm$structures)
humDNA.dist
is.euclid(humDNA.dist$samples)
is.euclid(humDNA.dist$regions)

## Not run:

data(ecomor)
dtaxo <- dist.taxo(ecomor$taxo)
ecomor.dist <- disc(ecomor$habitat, dtaxo)
ecomor.dist
is.euclid(ecomor.dist)
## End(Not run)