Hi, I think the problem is
1 - when a linear model is fitted, ploting the qqnorm( test.lm$ res ) we dont 'know' what values are actually being used on the y-axis; and how do we refer to the ‘Index’ on the x-axis?? therefore, i dont know how to refer to the x and y coordinates in the identify function 2 - i have tried using the stdres function in the MASS library, to extract the standardised residuals and plot them manully, ( using the plot ) function. this way, the problem is we have to SORT the residuals first in increasing order to reproduce the same qqnorm plot, in that case, 'identify' function works, however, that CHANGES the order, i.e. it wont return the original A:Z ( row.names ) label. -- View this message in context: http://r.789695.n4.nabble.com/how-exactly-does-identify-work-tp3045953p3049357.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.