sklearn Python 中的多元线性回归错误

Question

我正在尝试对数据集执行多元线性回归。我已经准备好数据集，train_test_split 已完成，当我尝试将模型拟合到线性回归量时，出现以下错误：

我还附上了下面的代码。请看一下并帮我解决错误。

import numpy as np
import matplotlib.pyplot as plt
import pandas as pd
%matplotlib inline

dataset = pd.read_csv('50_Startups.csv');

dataset.head()

x = dataset.iloc[:,:-1]
y = dataset.iloc[:,:4]

states = pd.get_dummies(x['State'], drop_first=True)

states.head()

x = x.drop('State', axis=1)

x.head()

x = pd.concat([x, states], axis=1)

from sklearn.model_selection import train_test_split

x_train, X_test, y_train, y_test =  train_test_split(x, y, test_size=0.2, random_state=0)

from sklearn.linear_model import LinearRegression

regressor = LinearRegression()
regressor.fit(x_train, y_train)

Answer 1

您因为选择了错误的Y值（目标值）而出现错误。 这会起作用 -

import numpy as np
import matplotlib.pyplot as plt
import pandas as pd
%matplotlib inline

dataset = pd.read_csv('50_Startups.csv');
dataset.head()

x = dataset.iloc[:,:-1]
y = dataset['Profit']

x = pd.get_dummies(dataset, prefix=['State'])


from sklearn.model_selection import train_test_split
x_train, X_test, y_train, y_test =  train_test_split(x, y, test_size=0.2, random_state=0)

from sklearn.linear_model import LinearRegression

regressor = LinearRegression()
regressor.fit(x_train, y_train)