Hi I have a x-list and a y-list and I'm trying to make a line that goes ca. through the dots. I want to find a, b and c in ax^2 + bx + c. How to do? Thanks, Knut -- View this message in context: http://r.789695.n4.nabble.com/R-quadreg-tp3328275p3328275.html Sent from the R help mailing list archive at Nabble.com.