Moving Average Pandas

Question

I would like to add a moving average calculation to my exchange time series.

Original data from Quandl

Exchange = Quandl.get("BUNDESBANK/BBEX3_D_SEK_USD_CA_AC_000",
                      authtoken="xxxxxxx")

#               Value
# Date               
# 1989-01-02  6.10500
# 1989-01-03  6.07500
# 1989-01-04  6.10750
# 1989-01-05  6.15250
# 1989-01-09  6.25500
# 1989-01-10  6.24250
# 1989-01-11  6.26250
# 1989-01-12  6.23250
# 1989-01-13  6.27750
# 1989-01-16  6.31250

# Calculating Moving Avarage
MovingAverage = pd.rolling_mean(Exchange,5)

#               Value
# Date          
# 1989-01-02      NaN
# 1989-01-03      NaN
# 1989-01-04      NaN
# 1989-01-05      NaN
# 1989-01-09  6.13900
# 1989-01-10  6.16650
# 1989-01-11  6.20400
# 1989-01-12  6.22900
# 1989-01-13  6.25400
# 1989-01-16  6.26550

I would like to add the calculated Moving Average as a new column to the right after Value using the same index (Date). Preferably I would also like to rename the calculated moving average to MA.

Answer 1

The rolling mean returns a Series you only have to add it as a new column of your DataFrame (MA) as described below.

For information, the rolling_mean function has been deprecated in pandas newer versions. I have used the new method in my example, see below a quote from the pandas documentation.

Warning Prior to version 0.18.0, pd.rolling_*, pd.expanding_*, and pd.ewm* were module level functions and are now deprecated. These are replaced by using the Rolling, Expanding and EWM. objects and a corresponding method call.

df['MA'] = df.rolling(window=5).mean()

print(df)
#             Value    MA
# Date                   
# 1989-01-02   6.11   NaN
# 1989-01-03   6.08   NaN
# 1989-01-04   6.11   NaN
# 1989-01-05   6.15   NaN
# 1989-01-09   6.25  6.14
# 1989-01-10   6.24  6.17
# 1989-01-11   6.26  6.20
# 1989-01-12   6.23  6.23
# 1989-01-13   6.28  6.25
# 1989-01-16   6.31  6.27