Nonlinear associations can exist that are not revealed by these descriptive statistics. The quantities sik and r k do not, in general, convey all there is to know about the association between two variables. , n, provided that the conable are changed to Yjk = cxjk + d, j stants a and c have the same sign. The value of r k remains unchanged if the measurements of the ith variable are changed to Yji = axj + b, j = 1, 2. Pearson Prentice HaHn 0 implies a tendency for one value of the pair to be large when the other value is large and also for both values to be small together.
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