* installing *source* package ‘OPCreg’ ...
** this is package ‘OPCreg’ version ‘0.2.0’
** using staged installation
** R
Error in parse(...) : 
  /srv/hornik/tmp/CRAN_pretest/OPCreg.Rcheck/00_pkg_src/OPCreg/R/IPC.R:37:8: unexpected assignment
36: for (i in (n0+1):n) {
37: Xcente?<-
           ^
ERROR: unable to collate and parse R files for package ‘OPCreg’
* removing ‘/srv/hornik/tmp/CRAN_pretest/OPCreg.Rcheck/OPCreg’