[BUG]: Computing normal stats is wrong

[dagap]

The following code:

organized[t].append(predictions[step+t-args.prediction_window_size][args.prediction_window_size-1-step])

Should this not be simply:

organized[t].append(predictions[step+t-args.prediction_window_size][step])

Otherwise, I think it is reversing the vector.

Also, I think you should use the absolute value for computing the error vector.