Raw alpha (low level diversity component)

Calculates the low-level diversity component necessary for calculating alpha diversity.

raw_alpha(meta)

Arguments

meta

object of class metacommunity

Value

raw_alpha returns an object of class powermean

Details

Values generated from raw_alpha() may be input into subdiv() and metadiv() to calculate raw subcommunity and metacommunity alpha diversity.

References

R. Reeve, T. Leinster, C. Cobbold, J. Thompson, N. Brummitt, S. Mitchell, and L. Matthews. 2016. How to partition diversity. arXiv 1404.6520v3:1–9.

Examples

pop <- data.frame(a = c(1,3), b = c(1,1))
row.names(pop) <- paste0("sp", 1:2)
pop <- pop/sum(pop)
meta <- metacommunity(pop)

# Calculate raw alpha component
a <- raw_alpha(meta)
subdiv(a, 1)
#>     measure q type_level type_name partition_level partition_name diversity
#> 1 raw alpha 1      types              subcommunity              a  2.632148
#> 2 raw alpha 1      types              subcommunity              b  6.000000
#>   dat_id transformation normalised  k max_d
#> 1  naive             NA         NA NA    NA
#> 2  naive             NA         NA NA    NA
metadiv(a, 1)
#>     measure q type_level type_name partition_level partition_name diversity
#> 1 raw alpha 1      types             metacommunity                 3.464102
#>   dat_id transformation normalised  k max_d
#> 1  naive             NA         NA NA    NA