tos_stdevall#

tos_stdevall(close, length=None, stds=None, ddof=None, offset=None, **kwargs)[source]#

TD Ameritrade’s Think or Swim Standard Deviation All (TOS_STDEV)

A port of TD Ameritrade’s Think or Swim Standard Deviation All indicator which returns the standard deviation of data for the entire plot or for the interval of the last bars defined by the length parameter.

Sources:

https://tlc.thinkorswim.com/center/reference/thinkScript/Functions/Statistical/StDevAll

Calculation:

Default Inputs:: length=None (All), stds=[1, 2, 3], ddof=1

LR = Linear Regression STDEV = Standard Deviation

LR = LR(close, length) STDEV = STDEV(close, length, ddof) for level in stds:

LOWER = LR - level * STDEV UPPER = LR + level * STDEV

Args:

close (pd.Series): Series of ‘close’s length (int): Bars from current bar. Default: None stds (list): List of Standard Deviations in increasing order from the

central Linear Regression line. Default: [1,2,3]

ddof (int): Delta Degrees of Freedom.: The divisor used in calculations is N - ddof, where N represents the number of elements. Default: 1

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.DataFrame: Central LR, Pairs of Lower and Upper LR Lines based on: mulitples of the standard deviation. Default: returns 7 columns.