search for: rarefying

Hi all, I have a matrix of counts for objects (rows) by samples (columns). I aimed for about 500 counts in each sample (I have about 80 samples) and would now like to rarefy these down to 100 counts in each sample using simple random sampling without replacement. I plan on rarefying several times for each sample. I could do the tedious looping task of making a list of all objects (with its associated identifier) in each sample and then use the wonderful "sampling" package to select a sub-sample of 100 for each sample and thereby get a logical vector of inclusions....

Quisiera intercambiar ideas con aquellos que lo hayan utilizado. Muchas gracias y bonito día! ---- *Angela Andrea Camargo Sanabria* Estudiante Doctorado en Ciencias Biológicas Laboratorio de Ecología de poblaciones y comunidades tropicales Centro de Investigaciones en Ecosistemas (CIEco) UNAM, campus Morelia Antigua Carretera a Pátzcuaro # 8701 Col. Ex-Hacienda de San José de la Huerta, CP 58190