Description Usage Arguments Value References Examples
Test for a difference between two independent samples of compositional data. Zeros of any type are allowed.
1 | testfordiff.ind.pval(compdata.1, compdata.2, ns1, R = 500)
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compdata.1 |
sample of compositional data. |
compdata.2 |
sample of compositional data. |
ns1 |
sample size of compdata.1. |
R |
number of bootstrap samples, default is 500. |
p-value obtained through a multivariate permutation test with test statistic based on chi-square distances.
Stewart, C., Iverson, S. and Field, C. (2014) Testing for a change in diet using fatty acid signatures. Environmental and Ecological Statistics 21, pp. 775-792.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | ## Prey
data(preyFAs)
## Capelin FA sig
capelin.sig=preyFAs[preyFAs$Species=="capelin",4:(ncol(preyFAs))]
capelin.sig=capelin.sig/apply(capelin.sig,1,sum)
## Sandlance FA sig
sandlance.sig=preyFAs[preyFAs$Species=="sandlance",4:(ncol(preyFAs))]
sandlance.sig=sandlance.sig/apply(sandlance.sig,1,sum)
# Note: uncomment examples to run. CRAN tests fail because execution time > 5 seconds
# testfordiff.ind.pval(as.matrix(capelin.sig),
# as.matrix(sandlance.sig),
# nrow(capelin.sig))
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