Thanks. Now at least I know that I use a "truncated mean", and that most other alternatives are unapplicable. I also managed to translate this term to swedish ("trimmat medelvärde") after a lot of searching (the swedish version of Wikipedia doesn't even mention it). So I will still be using the same method, but now I can motivate it better. :) --- b { font-weight: normal; } -- modified at 8:14 Friday 13th January, 2006