如何在python中分类变量中计数频率

Question

我有问题，我正在尝试计算分类数据的频率：

例如，如果我得到：

我想得到

有什么主意吗？

Answer 1

使用以下示例数据框（最小，但基于您的图像）：

>>> df
    Data Visualization     Machine Learning           Statistics
0       Not Interested  Somewhat Interested      Very Interested
1       Not Interested       Not Interested  Somewhat Interested
2  Somewhat Interested       Not Interested      Very Interested
3  Somewhat Interested       Not Interested  Somewhat Interested
4      Very Interested      Very Interested       Not Interested

您可以使用value_counts：

df.apply(lambda x: x.value_counts()).T


                    Not Interested  Somewhat Interested  Very Interested
Data Visualization               2                    2                1
Machine Learning                 3                    1                1
Statistics                       1                    2                2