On Thu, 18 Dec 2008 10:23:33 +1100, "Caitlin Vertigan" <caitlin.verti...@gmail.com> wrote:
> Hi all, I've just completed an analysis of short-tailed shearwater > breeding success in relation to human disturbance using a mixed model. > I'd like to do a power analysis on this now but am unaware of any way > to do it. Is it possible? Does anyone have any ideas? Thanks, > Caitlin Are you sure you want to do that? I was asked to provide power calculations for other types of models in a manuscript not long ago, and did a bit digging on this topic in general. I'm not sure what the consensus is now, but the following paper: Hoenig, J. M. & Heisey, D. M. The abuse of power: the pervasive fallacy of power calculations for data analysis Amer Statistician, 2001, 55, 19-24 is very convicing in showing that post-hoc power analyses are very misleading. In the mixed-effects modelling context, you might want to use a simulation approach as that presented by: Baayen, R. H.; Davidson, D. J. & Bates, D. M. Mixed-effects modeling with crossed random effects for subjects and items J Mem Lang, 2008, 59, 390-412 -- Seb _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology