efi#

efi(close, volume, length=None, mamode=None, drift=None, offset=None, **kwargs)[source]#

Elder’s Force Index (EFI)

Elder’s Force Index measures the power behind a price movement using price and volume as well as potential reversals and price corrections.

Sources:

https://www.tradingview.com/wiki/Elder%27s_Force_Index_(EFI) https://www.motivewave.com/studies/elders_force_index.htm

Calculation:

Default Inputs:: length=20, drift=1, mamode=None

EMA = Exponential Moving Average SMA = Simple Moving Average

pv_diff = close.diff(drift) * volume if mamode == ‘sma’:

EFI = SMA(pv_diff, length)

else:: EFI = EMA(pv_diff, length)

Args:

close (pd.Series): Series of ‘close’s volume (pd.Series): Series of ‘volume’s length (int): The short period. Default: 13 drift (int): The diff period. Default: 1 mamode (str): See `help(ta.ma)`. Default: ‘ema’ 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.