[R] How to calculate the AUC in R

["Dubas, João Paulo"]

Hello R-listers,

I'm working in an experiment that try to determine the degree of 
infection of different clones of a fungus and, one of the measures we 
use to determine these degree is the counting of antibodies in the 
plasma at different dilutions, in this experiment the maximum number of 
dilutions was eleven. I already checked for differences on the maximum 
concentration of the antibodies in function of each clone of the fungus. 
However one measure of interest is the area under the curve (AUC) for 
the counting of antibodies in function of dilution. Unfortunately I 
don't know how to calculate the AUC. Someone can point me an example of 
this procedure or a package that implements this calculation?

Thanks for the help,
João Paulo Dubas.