29 Aug 2011
11 Aug 2011
the data: number of indigenous and alien plant species with and without vegetative reproduction (N = 3399, mid-european species, data-courtesy: BiolFlor) . Hypothesis: The proportion of species with vegetative reproduction is different between alien and indigenuos plant species.
result: the prop. of plants with veg. reproduction is sign. lower for alien compared to indigenous plant species. this is simply due to the large number of agricultural weeds and contaminants within alien species - these species almost always reproduce by seeds.
8 Aug 2011
You could, however somewhat tedious, customize contrasts for the PERMANOVA and check for differences between certain level combinations.