Reducing the FPR (false positive rate)

Hello R-USERS, 

I think some people didn't understand my question. What I want is to
use the training set to minimize the FALSE POSITIVE RATE. 

I think it is possible. I sacrifice ACCURACY to have less FALSE
POSITIVES. I don't want a classifier result with 5% of FPR and, for
example, 93% of ACCURACY. I want a 1% FPR sacrificing the 93% ACCURACY.


Do you know how can I do this? I really need this because the requisite
of the work I'm doing is only 1% of FPR. 

Thanks and best regards. 

*************************************************
|????????????????| - Anderson de Rezende Rocha
Bacharel em Ci??ncia da Computa????o - UFLA
Mestrando em Ci??ncia da Computa????o - UNICAMP
Esteganografia e estegan??lise digital
UNIVERSIDADE ESTADUAL DE CAMPINAS, SP - BRASIL
< http://andersonrocha.cjb.net >