我有一个大型数据集,如下图所示,其中还包含“月”和“年”列。我尝试使用线性回归模型来预测每月的受害者总数,但我不知道如何获得受害者总数
from sklearn.linear_model import LinearRegression
reg = LinearRegression()
reg.fit(df_pre[[]],df_pre["Year"]) #don't know how to fit the data in here.
感谢帮助!
我尝试匹配维克特的年龄和月份,但我得到了错误的答案。我尝试创建一个新的数据框,其中仅包含月份和总受害者,然后拟合将具有不同的大小。
将数据拟合到模型背后的概念是:
reg.fit([all_inputs], [outputs])
In Machine learning terms:
reg.fit([features], [target])
由于我无法正确预览您的数据集,这里有一个简单的示例,介绍如何使用
LinearRegression
来拟合数据和预测。
假设我们有
x_1
、x_2
、y
的小数据集,其中 x_1
和 x_2
是特征(模型的输入),而 y
是目标(我们想要预测的) .
我们的数据集:
x_1 = [1, 1, 2, 2]
x_2 = [1, 2, 2, 3]
y = [6, 8, 9, 11]
data = [[1, 1, 6], [1, 2, 8], [2, 2, 9], [2, 3, 11]]
The nested lists are rows (that is data has 4 rows and 3 columns)
完整代码
# Import the packages and libraries
import numpy as np
from sklearn.linear_model import LinearRegression
import pandas as pd
# Convert our data into DataFrame
data = [[1, 1, 6], [1, 2, 8], [2, 2, 9], [2, 3, 11]]
columns = ["x_1", "x_2", "y"] # columns of the dataframe
df = pd.DataFrame(data, columns=columns) # This will turn the data into a table like your data.
# Split the data to features and label
X_train = df.copy()
y_train = X_train["y"] # This is the target/ label/ output
del X_train["y"] # delete the label from the copied dataframe, so we are left with the features only.
# To answer your question of how to fit and predict with LinearRegression
model = LinearRegression() # Instantiate the class
model.fit(X_train, y_train) # Fit the input (features i.e X_train "x_1, x_2") and the output (target "y") to the model.
result = model.predict(np.array([[3, 5]])) # Now, we want to use the model to make prediction by passing a new set of input/ features x_1 and x_2 to the model to predict
# so we should get result = [16.].
请注意,我们使用的是这个简单的二次方程
y = (1 * x_1) + (2 * x_2) + 3
,如果您应该将 x_1 = 3
和 x_2 = 5
传递给方程,则 y = 16
这意味着我们的模型工作正常。