&nbsp;new_age_group이 문자형으로 나오는데 왜 그런가요?

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@<a target="_blank" rel="noopener noreferrer nofollow" class="in-cell-link" href="https://basketballlegends.pro/">basketball legends</a> It is an issue that you should not be concerned about if you look at it based on the third test. If you listen to the lecture correctly, it will be explained to you, but if you don't listen to the lecture as I do and just solve the problem, you will not be able to understand it.

Cộng đồng Hỏi & Đáp của Inflearn

summary(df_final)했을 때