def senkou_b(data, period=<NUM_LIT>):
sb = conversion_base_line_helper(data, period)<EOL>shift_by = np.repeat(np.nan, <NUM_LIT>)<EOL>sb = np.append(shift_by, sb)<EOL>return sb<EOL>
Senkou B (Leading Span B)

Formula:
(H + L) / 2  :: default period=52 :: shifted forward 26 bars