Expanding
=========

.. currentmodule:: pandasCore

Expanding window operations for cumulative calculations.

Example
-------

.. code-block:: python

   import pandasCore as pd

   s = pd.Series([1, 2, 3, 4, 5])
   s.expanding().mean()  # [1.0, 1.5, 2.0, 2.5, 3.0]
   s.expanding().sum()   # [1, 3, 6, 10, 15]

Parameters
----------

.. list-table::
   :widths: 15 10 10 65
   :header-rows: 1

   * - Parameter
     - Type
     - Default
     - Description
   * - min_periods
     - int
     - 1
     - Minimum observations needed
   * - center
     - bool
     - False
     - Set labels at center
   * - axis
     - int
     - 0
     - Axis to expand on

Methods
-------

Same aggregation methods as Rolling:

- count(), sum(), mean(), median()
- var(), std(), min(), max()
- corr(), cov(), skew(), kurt()
- apply(), agg(), quantile(), sem(), rank()