Dear All,

I am trying to calculate values of SE from an analysis of multivariate homogeneity of groups dispersions (betadisper {vegan})?

With function betadisper() I get values of the average distance to centroid/group and it is also possible to draw a boxplot with function boxplot() with variance information but I can´t find a way to tell R to caclulate SE.

I realise it is possible to calulate (by hand) from the formula for the distance from a point to it´s centroid:

z[ij]^c = sqrt(Delta^2(u[ij]^+, c[i]^+) - Delta^2(u[ij]^-, c[i]^-))

given in the R documentation, by using the scores of the different points and centroids that can be obtained by using function scores (). But before I go there I thought I´d ask if there is an easier way to obtain the variance information (in my case SE).

I am greatful for any help/advice I can get.

/Emma
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