See Windowing Operations <window.generic>
for further usage details and examples.
Size of the moving window.
If an integer, the fixed number of observations used for each window.
If an offset, the time period of each window. Each window will be a variable sized based on the observations included in the time-period. This is only valid for datetimelike indexes. To learn more about the offsets & frequency strings, please see :None:None:`this link
<https://pandas.pydata.org/pandas-docs/stable/user_guide/timeseries.html#offset-aliases>`.
If a BaseIndexer subclass, the window boundaries based on the defined get_window_bounds
method. Additional rolling keyword arguments, namely min_periods
, center
, and closed
will be passed to get_window_bounds
.
Minimum number of observations in window required to have a value; otherwise, result is np.nan
.
For a window that is specified by an offset, min_periods
will default to 1.
For a window that is specified by an integer, min_periods
will default to the size of the window.
If False, set the window labels as the right edge of the window index.
If True, set the window labels as the center of the window index.
If None
, all points are evenly weighted.
If a string, it must be a valid :None:None:`scipy.signal window function
<https://docs.scipy.org/doc/scipy/reference/signal.windows.html#module-scipy.signal.windows>`.
Certain Scipy window types require additional parameters to be passed in the aggregation function. The additional parameters must match the keywords specified in the Scipy window type method signature.
For a DataFrame, a column label or Index level on which to calculate the rolling window, rather than the DataFrame's index.
Provided integer column is ignored and excluded from result since an integer index is not used to calculate the rolling window.
If 0
or 'index'
, roll across the rows.
If 1
or 'columns'
, roll across the columns.
If 'right'
, the first point in the window is excluded from calculations.
If 'left'
, the last point in the window is excluded from calculations.
If 'both'
, the no points in the window are excluded from calculations.
If 'neither'
, the first and last points in the window are excluded from calculations.
Default None
( 'right'
).
The closed parameter with fixed windows is now supported.
Execute the rolling operation per single column or row ( 'single'
) or over the entire object ( 'table'
).
This argument is only implemented when specifying engine='numba'
in the method call.
Provide rolling window calculations.
ewm
Provides exponential weighted functions.
expanding
Provides expanding transformations.
>>> df = pd.DataFrame({'B': [0, 1, 2, np.nan, 4]})
... df B 0 0.0 1 1.0 2 2.0 3 NaN 4 4.0
window
Rolling sum with a window length of 2 observations.
This example is valid syntax, but we were not able to check execution>>> df.rolling(2).sum() B 0 NaN 1 1.0 2 3.0 3 NaN 4 NaN
Rolling sum with a window span of 2 seconds.
This example is valid syntax, but we were not able to check execution>>> df_time = pd.DataFrame({'B': [0, 1, 2, np.nan, 4]},This example is valid syntax, but we were not able to check execution
... index = [pd.Timestamp('20130101 09:00:00'),
... pd.Timestamp('20130101 09:00:02'),
... pd.Timestamp('20130101 09:00:03'),
... pd.Timestamp('20130101 09:00:05'),
... pd.Timestamp('20130101 09:00:06')])
>>> df_time B 2013-01-01 09:00:00 0.0 2013-01-01 09:00:02 1.0 2013-01-01 09:00:03 2.0 2013-01-01 09:00:05 NaN 2013-01-01 09:00:06 4.0This example is valid syntax, but we were not able to check execution
>>> df_time.rolling('2s').sum() B 2013-01-01 09:00:00 0.0 2013-01-01 09:00:02 1.0 2013-01-01 09:00:03 3.0 2013-01-01 09:00:05 NaN 2013-01-01 09:00:06 4.0
Rolling sum with forward looking windows with 2 observations.
This example is valid syntax, but we were not able to check execution>>> indexer = pd.api.indexers.FixedForwardWindowIndexer(window_size=2)
... df.rolling(window=indexer, min_periods=1).sum() B 0 1.0 1 3.0 2 2.0 3 4.0 4 4.0
min_periods
Rolling sum with a window length of 2 observations, but only needs a minimum of 1 observation to calculate a value.
This example is valid syntax, but we were not able to check execution>>> df.rolling(2, min_periods=1).sum() B 0 0.0 1 1.0 2 3.0 3 2.0 4 4.0
center
Rolling sum with the result assigned to the center of the window index.
This example is valid syntax, but we were not able to check execution>>> df.rolling(3, min_periods=1, center=True).sum() B 0 1.0 1 3.0 2 3.0 3 6.0 4 4.0This example is valid syntax, but we were not able to check execution
>>> df.rolling(3, min_periods=1, center=False).sum() B 0 0.0 1 1.0 2 3.0 3 3.0 4 6.0
win_type
Rolling sum with a window length of 2, using the Scipy 'gaussian'
window type. std
is required in the aggregation function.
>>> df.rolling(2, win_type='gaussian').sum(std=3) B 0 NaN 1 0.986207 2 2.958621 3 NaN 4 NaNSee :
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