int len 25 $unit数 $len $len$unit回帰曲線 khaki let((a = series(1, 1+len).map(lambda ((int x) x - (1+len)*0.5)), m = close(len).avg(), q = close(len).map(lambda ((double x) x - m)), b = sum(a * q) / sum(a * a)) avg(close(len)) + b * (1+len) / 2)