回答編集履歴
1
test
CHANGED
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@@ -13,9 +13,10 @@
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#
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dfa = df.set_index(['DATE', 'グループ'])
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dfb = df.
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dfb = df.set_index([df['DATE'] + pd.DateOffset(years=1), 'グループ'])
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dfa = dfa.assign(YoY = dfa['値'] / dfb).reset_index()
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dfa = dfa.assign(YoY = dfa['値'] / dfb['値']).reset_index()
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print(dfa)
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# DATE グループ 値 YoY
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# 0 2023-01-01 A 100 NaN
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