on_balance_volume

Library "on_balance_volume"
on_balance_volume: custom on balance volume

obv_diff(string, simple) obv_diff: custom on balance volume diff version
  Parameters:
    string: type: the moving average type of on balance volume
    simple: int len: the moving average length of on balance volume
  Returns: obv_diff: custom on balance volume diff value

obv_diff_norm(string, simple) obv_diff_norm: custom normalized on balance volume diff version
  Parameters:
    string: type: the moving average type of on balance volume
    simple: int len: the moving average length of on balance volume
  Returns: obv_diff: custom normalized on balance volume diff value

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