在计算系列的平均真实范围[ATR]时,我被卡住了。 ATR基本上TrueRange的精通企图不平均[TR]需要PandasDataSeries上的平均真实范围和指数移动平均函数
TR is nothing but MAX of -
Method 1: Current High less the current Low
Method 2: Current High less the previous Close (absolute value)
Method 3: Current Low less the previous Close (absolute value)
在熊猫我们没有一个内置的EMA功能。相反,我们有EWMA这是一个加权移动平均数。
如果有人可以帮助计算EMA,也将是足够好的
def ATR(df,n):
df['H-L']=abs(df['High']-df['Low'])
df['H-PC']=abs(df['High']-df['Close'].shift(1))
df['L-PC']=abs(df['Low']-df['Close'].shift(1))
df['TR']=df[['H-L','H-PC','L-PC']].max(axis=1)
df['ATR_' + str(n)] =pd.ewma(df['TR'], span = n, min_periods = n)
return df
上面的代码犯规给错误,但它也犯规要么放弃正确的价值观。我用手动在Excel中对同一dataseries计算ATR值相比较它和值分别为不同
ATR excel formula-
Current ATR = [(Prior ATR x 13) + Current TR]/14
- Multiply the previous 14-day ATR by 13.
- Add the most recent day's TR value.
- Divide the total by 14
这是我作为一个样本dataseries
start='2016-1-1'
end='2016-10-30'
auro=web.DataReader('AUROPHARMA.NS','yahoo',start,end)