Hello all:

 

I've got a data frame with a column of presence-only data (0 and 1) and the
variables of interest in modeling its distribution.

 

I want to select a number of "0" as pseudo-absences, such as a proportion of
the "0" or 5 (for example) times the number of presences. 

 

How can it be done?

 

Thanks,  

 

Frederico Mestre

 


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