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...his paper Wiegand T., and K. A. Moloney 2004. > Rings, circles and null-models for point pattern analysis in ecology. > Oikos 104: 209-229 a statistic he called O-Ring statistic which is > similar to Ripley's K, only that it uses rings instead of circles. > > http://www.oesa.ufz.de/towi/towi_programita.html#ring > > Is this statistic included in one of the packages in R? This kind of functionality is available in the R package `spatstat' (available on CRAN or from www.spatstat.org) According to the cited website, the O-ring statistic is a rescaled versi...

Hi Thorsten Wiegand used in his paper Wiegand T., and K. A. Moloney 2004. Rings, circles and null-models for point pattern analysis in ecology. Oikos 104: 209-229 a statistic he called O-Ring statistic which is similar to Ripley's K, only that it uses rings instead of circles. http://www.oesa.ufz.de/towi/towi_programita.html#ring Is this statistic included in one of the packages in R? Thanks, Rainer -- Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation Biology (UCT) Department of Conservation Ecology University of Stellenbosch Matieland 7602 South Africa Tel: +27 - (0)...

Dear all, I am trying to find a R version of the S+ routine fac.design. In the help of the package conf.design fac.design is listed under "see also". Any clues as to where (which package) I can find fac.design? thanks Steve. Steven Higgins Department of Ecological Modelling UFZ - Centre for Environmental Research Leipzig-Halle Permoserstrasse 15 D-04318 Leipzig Germany Phone:

Hi, There seems to be a problem with the power-operation of the form c(..., -a, ...)^x.yyy Four code examples for the same calculation, which perform differently: -3^3.2 Result: [1] -33.63474 c(-3,6)^3.2 Result: [1] NaN 309.0893 But: c(-3.62,3)^3 Result: [1] -47.43793 27.00000 I can reproduce NaN even in the following calculation: c(-3,6)[1]^3.2 Result: [1] NaN but c(-3,6)[2]^3.2 Result: