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Figure 1. Scatter graph of four datasets of repeated measurements. The first measurement is 10, 20, 30, 40, 50 in all cases. In dataset A ({blacksquare}) the second measurement equals the first, in dataset B ({blacktriangleup}) the second measurement is exactly twice the first, in dataset C ({blacktriangledown}) the second measurement is exactly one-tenth the first and in dataset D ({blacklozenge}) the second measurement is exactly ten-times the first. In all cases, Pearson's correlation coefficient (r) is 1.





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