N
>>> index = pd.Index([3, 1, 2, 3, 4, np.nan])
>>> index.value_counts()
3.0 2
4.0 1
2.0 1
1.0 1
dtype: int64
N
df['freq'] = df.groupby('myvar')['myvar'].transform('count')
N
from collections import Counter
values=np.ones(10)
Counter(values)
relativefrequencies de valori unice panda
df.value_counts(normalize=True)
panda conta valorile de coloană
df = pd.DataFrame({'a':list('abssbab')})
df.groupby('a').count()