Hi Richard, I am having the same error you encountered as described in: https://stat.ethz.ch/pipermail/r-help/2009-August/207010.html Do you happen to know the solution to this problem? I'm stuck on the same issue. Thanks, Richard Davis Analyst | Taylor Fry Consulting Actuaries <http://www.taylorfry.com.au/> Level 11, 55 Clarence Street | Sydney NSW 2000 P: 02 9249 2906 | E: richard.davis@taylorfry.com.au <mailto:richard.davis@taylorfry.com.au> Please consider the environment before printing this email [[alternative HTML version deleted]]