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                     [        US5      nUS-   n[        X5      n [        X5      n[        X+5      nU b  Ub  Uc  g[        US5      n[        US5      n[	        U5      n[        US5      n[        U5      n[        U	5      n	[        S   (       a  U(       a  SS	K	J
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D6-  nU	S:w  a  UR                  U	5      nSU
;   a  UR                  U
S   SS9  SU 3Ul        SUl        U$ )a  Normalized Average True Range

This indicator applies a normalizer to Average True Range.

Sources:
    * [tradingtechnologies](https://www.tradingtechnologies.com/help/x-study/technical-indicator-definitions/normalized-average-true-range-natr/)

Parameters:
    high (Series): ```high``` Series
    low (Series): ```low``` Series
    close (Series): ```close``` Series
    length (int): The period. Default: ```20```
    scalar (float): Scalar. Default: ```100```
    mamode (str): See ```help(ta.ma)```. Default: ```"ema"```
    talib (bool): If installed, use TA Lib. Default: ```True```
    prenan (bool): Sets initial values to ```np.nan``` based
        on ```drift```. Default: ```False```
    offset (int): Post shift. Default: ```0```

Other Parameters:
    fillna (value): ```pd.DataFrame.fillna(value)```

Returns:
    (Series): 1 column

Warning:
    TA-Lib Correlation: ```np.float64(0.9506743353852364)```

Tip:
    Corrective contributions welcome!
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