Hi R-friends.
   
  I have a mammal´s dataset looking like:
   
       Region   Species Sex  Bodysize
         1           Sp1      M      10.2
         1           Sp1      M      12.1
         1           Sp1      M       9.1
        ...
   
  I have three regions, four species and the body size of 10 individual. I´d like to do a bootstrap resample (100 resamples) of 4 of 10 individuals for each Region, Species and Sex and compute de means and S.D. for the combinations Regions-Species-Sex.
   
  How can I do that?
   
  Thanks a lot,
   
  Miltinho

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