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sphericity calculation
2 messages · Darren Weber, Uwe Ligges
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]]
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