" ==Fitting the regression line== In ==Fitting the regression line== shouldn't the expression immediately before the one containing Cov & Var have 1/n as the multiplier before the - x.y and before the - x^2 terms? This is the form of the expression which is often used in computing to generate a straight-line fit to set of ""bumpy"" data. As expressed here it does not work and moreover does not follow mathematically from the preceding expression! However with the 1/n terms in place it appears to produce the correct result. 1/n is unique to these two terms ONLY and therefore does NOT cancel?!? But then I am a Physicist and not a Mathematician so I may have missed something???
" ==Fitting the regression line== In ==Fitting the regression line== shouldn't the expression immediately before the one containing Cov & Var have 1/n as the multiplier before the - x.y and before the - x^2 terms? This is the form of the expression which is often used in computing to generate a straight-line fit to set of ""bumpy"" data. As expressed here it does not work and moreover does not follow mathematically from the preceding expression! However with the 1/n terms in place it appears to produce the correct result. 1/n is unique to these two terms ONLY and therefore does NOT cancel?!? But then I am a Physicist and not a Mathematician so I may have missed something???
