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
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