回归模型与房价预测
2018-12-06 11:53 cqchenqin 阅读(228) 评论(0) 编辑 收藏 举报from sklearn.datasets import load_boston# 导入boston房价数据集 boston=load_boston()
import numpy
boston.keys()#查看每一个key值
print(boston.DESCR)
boston.data.shape
import pandas as pd pd.DataFrame(boston.data)
boston.feature_names
boston.target
import pandas as pd#以(类似excel)表格形式表现boston.data数据集 df=pd.DataFrame(boston.data) df
#求出w,b之后可以画出x和y的直线与点图的关系。一元线性回归 from sklearn.linear_model import LinearRegression lr = LinearRegression() x = x.reshape(-1,1) lr.fit(x,y) w = lr.coef_ #y=wx+b,w为斜率,b为截距 b = lr.intercept_ print(w) print(b) from matplotlib import pyplot as plt x=boston.data[:,5] y=boston.target plt.scatter(x,y) #点图 plt.plot(x,9.1*x-34.7,'r') #直线 plt.show() x.shape
import matplotlib.pyplot as plt
x = boston.data[:,12].reshape(-1,1)
y = boston.target
plt.figure(figsize=(10,6))
plt.scatter(x,y)
from sklearn.linear_model import LinearRegression
lineR = LinearRegression()
lineR.fit(x,y)
y_pred = lineR.predict(x)
plt.plot(x,y_pred)
print(lineR.coef_,lineR.intercept_)
plt.show()
#多元线性回归
from sklearn.linear_model import LinearRegression
lr = LinearRegression()
lr.fit(boston.data,y)
w = lr.coef_
print(w)
b = lr.intercept_
b
x_poly
#一元多项式回归模型,建立一个变量与房价之间的预测模型,并图形化显示。
from sklearn.preprocessing import PolynomialFeatures
poly = PolynomialFeatures(degree=2)
x_poly = poly.fit_transform(x)
lp = LinearRegression()
lp.fit(x_poly,y)
y_poly_pred = lp.predict(x_poly)
plt.scatter(x,y)
plt.plot(x,y_poly_pred,'r')
plt.show()
from sklearn.preprocessing import PolynomialFeatures
poly = PolynomialFeatures(degree=2)
x_poly = poly.fit_transform(x)
lrp = LinearRegression()
lrp.fit(x_poly,y)
plt.scatter(x,y)
plt.scatter(x,y_pred)
plt.scatter(x,y_poly_pred) #多项回归
plt.show()