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Multiple Regressors: Cartoon
¥ Red curve = signal model for class #1
¥ Green curve = signal model for #2
¥ Blue curve =
    b1×#1+b2×#2
where b1 and b2 vary from 0.1 to 1.7 in the animation
¥ Goal of regression is to find b1 and b2 that make the blue curve best fit the data time series
¥ Gray curve =
  1.5×#1+0.6×#2+noise
 = simulated data