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test
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``model = LinearRegression()``の後に``model.fit(X, Y)``が必要です。
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---
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【ご参考】
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```Python
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import pandas as pd
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import numpy as np
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import matplotlib.pyplot as plt
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from sklearn.linear_model import LinearRegression
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icecream = [[1,464],[2,397],[3,493],[4,617],[5,890],[6,883],[7,1292],[8,1387],[9,843],[10,621],[11,459],[12,561]]
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tempreture = [[1,10.6],[2,12,2],[3,14.9],[4,20.3],[5,25.2],[6,26.3],[7,29.7],[8,31.6],[9,27.7],[10,22.6],[11,15.5],[12,13.8]]
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X = pd.DataFrame([u[1] for u in tempreture])
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Y = pd.DataFrame([u[1] for u in icecream])
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model = LinearRegression()
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model.fit(X, Y)
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plt.scatter(X, Y)
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plt.plot(X, model.predict(X),"red")
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plt.grid()
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plt.show()
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```
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pandas 1.0.5
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numpy 1.18.5
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matplotlib 3.2.2
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scikit-learn 0.23.1
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Python 3.8.3
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