小编gur*_*kan的帖子

I have a large dataframe similar to this one:

In [1]: grades
Out[1]: 
                          course1  course2
school  class  student                    
school1 class1 student1         2        2
               student2         3        2
               student3         1        3
               student4         3        1
               student5         3        1
...                           ...      ...
        class3 student86        3        1
               student87        2        2
               student88        1        1
               student89        3        3
               student90        0        1

[90 rows x 2 columns]

I want to compute the Mann-Whitney rank test on the grades from the sample school and each sub-sample class. How can …