nvi

nvi(close, volume, length=None, initial=None, offset=None, **kwargs)

Negative Volume Index (NVI)

The Negative Volume Index is a cumulative indicator that uses volume change in an attempt to identify where smart money is active.

Sources:

https://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:negative_volume_inde https://www.motivewave.com/studies/negative_volume_index.htm

Calculation:

Default Inputs:

length=1, initial=1000

ROC = Rate of Change

roc = ROC(close, length) signed_volume = signed_series(volume, initial=1) nvi = signed_volume[signed_volume < 0].abs() * roc_ nvi.fillna(0, inplace=True) nvi.iloc[0]= initial nvi = nvi.cumsum()

Args:

close (pd.Series): Series of ‘close’s volume (pd.Series): Series of ‘volume’s length (int): The short period. Default: 13 initial (int): The short period. Default: 1000 offset (int): How many periods to offset the result. Default: 0

Kwargs:

fillna (value, optional): pd.DataFrame.fillna(value) fill_method (value, optional): Type of fill method

Returns:

pd.Series: New feature generated.