calcbeta_stat: Calculate beta-diversity statistic for a single realization
In bbolker/betararef: Beta Diversity with Rarefaction

Calculate beta-diversity statistic for a single realization

1 2	calcbeta_stat(m, ttt, method = "jaccard", binary = TRUE, stat = c("Fstat", "Fstat_perm", "pval_perm", "pval_Fstat_perm"))

`m`	community matrix
`ttt`	treatment/grouping factor
`method`	beta diversity metric
`binary`	compute beta diversity based on presence/absence?
`stat`	beta diversity statistic to store: `Fstat`=F-statistic from `anova.betadisper`; `Fstat_perm`=F-statistic from `permutest.betadisper`; `pval_perm`=p-value from `permutest.betadisper`; `pval_Fstat_perm`=F- and p-values as above