search for: madifa

Dear All, I have a set of environental maps and presence-only points for some species. How can I generate distributions models on R using these presence-only data? What packages and functions can I use to do so? Kind regards, Miltinho Brazil [[alternative HTML version deleted]]

Dear all, I have just uploaded to CRAN the version 1.5 of the package 'adehabitat'. Significant changes are listed below: * the package now contains a new function allowing a factorial decomposition of the Mahalanobis distances in habitat selection studies, named madifa(). * The ENFA can now be performed using all kinds of variables (numeric, factors, fuzzy, mixing of several types, etc.) * Several methods allowing the analysis of animals movements have been added, including the first passage time (function fpt()), a rediscretization algorithm (redisltraj()),...

Is there a way to just build a madifa function in adehabitat just using a .csv file with presences and the corresponding environmental data? I'm trying to model the species distribution of a species using 45 environmental grids and r crashes after loading just 5 of them. I'd like to develop the function and then predict it usin...

Dear all, I have just uploaded to CRAN the version 1.5 of the package 'adehabitat'. Significant changes are listed below: * the package now contains a new function allowing a factorial decomposition of the Mahalanobis distances in habitat selection studies, named madifa(). * The ENFA can now be performed using all kinds of variables (numeric, factors, fuzzy, mixing of several types, etc.) * Several methods allowing the analysis of animals movements have been added, including the first passage time (function fpt()), a rediscretization algorithm (redisltraj()),...

...ge contains several demo files to allow an overview of these parts : demo(rastermaps), demo(homerange), demo(managltraj), demo(analysisltraj), demo(nichehs). * the package now contains a new function allowing the exploration of the ecological niche, which generalizes several factor analyses (ENFA, MADIFA, ...) and is closely related to several methods (Mahalanobis distances, selection ratios, etc.), named gnesfa() (see the examples of the help page for the properties of this analysis). * The class ltraj now distinguishes two types of trajects: type I (time not recorded, e.g. tracks of animals in t...

...ge contains several demo files to allow an overview of these parts : demo(rastermaps), demo(homerange), demo(managltraj), demo(analysisltraj), demo(nichehs). * the package now contains a new function allowing the exploration of the ecological niche, which generalizes several factor analyses (ENFA, MADIFA, ...) and is closely related to several methods (Mahalanobis distances, selection ratios, etc.), named gnesfa() (see the examples of the help page for the properties of this analysis). * The class ltraj now distinguishes two types of trajects: type I (time not recorded, e.g. tracks of animals in t...