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  • Ruben Laguna thinks this is interesting:

R1 = –0.9, R2 = 0.81, R3 = –0.73

From

Cover of Basic Data Analysis for Time Series with R

Note

R1 = a1^1 , R2 = a1^2 = 0.9_0.9, R3 = a1^3 = 0.9 _ 0.9 *0.9