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Classe « DataFrame »

Méthode pandas.DataFrame.mode

Signature de la méthode mode

def mode(self, axis: 'Axis' = 0, numeric_only: 'bool' = False, dropna: 'bool' = True) -> 'DataFrame' 

Description

help(DataFrame.mode)

Get the mode(s) of each element along the selected axis.

The mode of a set of values is the value that appears most often.
It can be multiple values.

Parameters
----------
axis : {0 or 'index', 1 or 'columns'}, default 0
    The axis to iterate over while searching for the mode:

    * 0 or 'index' : get mode of each column
    * 1 or 'columns' : get mode of each row.

numeric_only : bool, default False
    If True, only apply to numeric columns.
dropna : bool, default True
    Don't consider counts of NaN/NaT.

Returns
-------
DataFrame
    The modes of each column or row.

See Also
--------
Series.mode : Return the highest frequency value in a Series.
Series.value_counts : Return the counts of values in a Series.

Examples
--------
>>> df = pd.DataFrame([('bird', 2, 2),
...                    ('mammal', 4, np.nan),
...                    ('arthropod', 8, 0),
...                    ('bird', 2, np.nan)],
...                   index=('falcon', 'horse', 'spider', 'ostrich'),
...                   columns=('species', 'legs', 'wings'))
>>> df
           species  legs  wings
falcon        bird     2    2.0
horse       mammal     4    NaN
spider   arthropod     8    0.0
ostrich       bird     2    NaN

By default, missing values are not considered, and the mode of wings
are both 0 and 2. Because the resulting DataFrame has two rows,
the second row of ``species`` and ``legs`` contains ``NaN``.

>>> df.mode()
  species  legs  wings
0    bird   2.0    0.0
1     NaN   NaN    2.0

Setting ``dropna=False`` ``NaN`` values are considered and they can be
the mode (like for wings).

>>> df.mode(dropna=False)
  species  legs  wings
0    bird     2    NaN

Setting ``numeric_only=True``, only the mode of numeric columns is
computed, and columns of other types are ignored.

>>> df.mode(numeric_only=True)
   legs  wings
0   2.0    0.0
1   NaN    2.0

To compute the mode over columns and not rows, use the axis parameter:

>>> df.mode(axis='columns', numeric_only=True)
           0    1
falcon   2.0  NaN
horse    4.0  NaN
spider   0.0  8.0
ostrich  2.0  NaN

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