Chia C Chong wrote: > > I have 2 random variables (X and Y). The covariance,c was found equal to > 20.2006 and their correlation coefficient,p was 0.0245. > > From the statistical book, if their c=0, means that X and Y are uncorrelated > i.e p=0. However, in my case, c is quite large but p is extremely > small...So, what justification could I said with this kind of data?? > It measn the variances are large. If s_A is the standard deviation of A, then
p_XY = c_XY/(s_X*s_Y) So for your data, s_X*s_Y = 824.5. This is why we use p, it's re-scaled so that the variances are 1, so we can compare correlations of variables with different variances. In this case, p looks very close to 0. Bob -- Bob O'Hara Metapopulation Research Group Division of Population Biology Department of Ecology and Systematics PO Box 17 (Arkadiankatu 7) FIN-00014 University of Helsinki Finland tel: +358 9 191 28779 mobile: +358 50 599 0540 (Yes, I have finally joined 21st Century Finland) fax: +358 9 191 28701 email: [EMAIL PROTECTED] To induce catatonia, visit <http://www.helsinki.fi/science/metapop/> It is being said of a certain poet, that though he tortures the English language, he has still never yet succeeded in forcing it to reveal his meaning - Beachcomber ================================================================= Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =================================================================
