How can I find mean for same value column? in pandas
Question:
I have dataframe, and I am trying to find mean of stars for each name
Name stars
0 A 5
1 A 5
2 B 3
3 C 2
4 B 4
5 B 2
6 B 2
Output:
count mean stars
A 2 5.00
C 1 2.00
B 4 1.57
Answers:
Group the dataframe by Name, then apply len, and np.mean aggregates on stars column.
>>> df.groupby('Name')['stars'].agg(**{ 'count': len, 'mean stars': np.mean})
count mean stars
Name
A 2 5.00
B 4 2.75
C 1 2.00
I have dataframe, and I am trying to find mean of stars for each name
Name stars
0 A 5
1 A 5
2 B 3
3 C 2
4 B 4
5 B 2
6 B 2
Output:
count mean stars
A 2 5.00
C 1 2.00
B 4 1.57
Group the dataframe by Name, then apply len, and np.mean aggregates on stars column.
>>> df.groupby('Name')['stars'].agg(**{ 'count': len, 'mean stars': np.mean})
count mean stars
Name
A 2 5.00
B 4 2.75
C 1 2.00