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@@ -36,36 +36,36 @@
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```Python
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# ID
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# IDの値毎に数を数えて、出現回数列に入れる
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df["出現回数"] = df.groupby('ID').transform('count')
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print(df)
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ID date 出現回数
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# ID date 出現回数
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0 a 2010 5
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#0 a 2010 5
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1 a 2011 5
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#1 a 2011 5
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2 b 2012 3
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#2 b 2012 3
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3 c 2013 2
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#3 c 2013 2
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4 d 2014 2
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#4 d 2014 2
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5 c 2015 2
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#5 c 2015 2
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6 b 2016 3
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#6 b 2016 3
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7 a 2017 5
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#7 a 2017 5
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8 d 2018 2
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#8 d 2018 2
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9 e 2019 1
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#9 e 2019 1
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10 a 2020 5
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#10 a 2020 5
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11 a 2021 5
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#11 a 2021 5
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```
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