rD and rE can be considered as two random variables. Corr(rD, rE) is the correlation coefficient between these two variables. Cov(rD, rE) is the covariance between the two variables. sigmaD and sigmaE are the standard errors for rD and rE respectively.
Hope this is helpful.
Happy Chinese New Year!
hello thank u for replying my topic, virtually, i know what u r saying about! I just want to know the procedure how to prove these formula, could u tell me about this if u can! Happy new year!!!2#jennyli1346
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