Dear Prof. Baron, thankyou for your pdf paper on using R, at http://www.psych.upenn.edu/~baron/rpsych.pdf I am currently interested in the sphericity notes on pp. 45-47. The equation on p. 46 suggests the following R calculation: D <- k^2 * ( mean(diag(S)) - mean(S) )^2 while the notes in the pdf indicate the following: D <- k^2 * ( mean(S) - mean(diag(S)) )^2 Can you please consider this and advise the correct calculation? Best, Darren [[alternative HTML version deleted]]
Darren Weber wrote:> Dear Prof. Baron, > > thankyou for your pdf paper on using R, at > > http://www.psych.upenn.edu/~baron/rpsych.pdf > > I am currently interested in the sphericity notes on pp. 45-47. > > The equation on p. 46 suggests the following R calculation: > > D <- k^2 * ( mean(diag(S)) - mean(S) )^2 > > while the notes in the pdf indicate the following: > > D <- k^2 * ( mean(S) - mean(diag(S)) )^2 > > Can you please consider this and advise the correct calculation?Both are equal! Mathematical calculations you should really know from school show that (a - b)^2 = (b - a)^2 ..... Uwe Ligges> Best, Darren > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html