Hi, Thank you so much for all your rapid answers. I am impressed.
What i didn't know was that i have to assign my data to an object to work further on. It was not clear from the help (at least for me) that 'data()' itself is calling data already in R packages. All of you make that clear. Now, if you can suggest any good package to use for identifying outliers it will be great ;-)) Hopefully from now one, since i understood how i am using the examples, what 'data()' means and how i am using my own data, i will put less trivial questions. thank you so much indeed, Monica Monica Palaseanu-Lovejoy University of Manchester School of Geography Mansfield Cooper Building Oxford Road, Manchester M13 9PL, UK. email: [EMAIL PROTECTED] ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help