官术网_书友最值得收藏!

Example of multilinear regression - step-by-step methodology of model building

In this section, we actually show the approach followed by industry experts while modeling using linear regression with sample wine data. The statmodels.api package has been used for multiple linear regression demonstration purposes instead of scikit-learn, due to the fact that the former provides diagnostics on variables, whereas the latter only provides final accuracy, and so on:

>>> import numpy as np 
>>> import pandas as pd 
>>> import statsmodels.api as sm 
>>> import matplotlib.pyplot as plt 
>>> import seaborn as sns 
>>> from sklearn.model_selection import train_test_split     
>>> from sklearn.metrics import r2_score 
 
>>> wine_quality = pd.read_csv("winequality-red.csv",sep=';')   
# Step for converting white space in columns to _ value for better handling  
>>> wine_quality.rename(columns=lambda x: x.replace(" ", "_"), inplace=True) 
>>> eda_colnms = [ 'volatile_acidity',  'chlorides', 'sulphates', 'alcohol','quality'] 
# Plots - pair plots 
>>> sns.set(style='whitegrid',context = 'notebook') 

Pair plots for sample five variables are shown as follows; however, we encourage you to try various combinations to check various relationships visually between the various other variables:

>>> sns.pairplot(wine_quality[eda_colnms],size = 2.5,x_vars= eda_colnms, y_vars= eda_colnms) 
>>> plt.show() 

In addition to visual plots, correlation coefficients are calculated to show the level of correlation in numeric terminology; these charts are used to drop variables in the initial stage, if there are many of them to start with:

>>> # Correlation coefficients 
>>> corr_mat = np.corrcoef(wine_quality[eda_colnms].values.T) 
>>> sns.set(font_scale=1) 
>>> full_mat = sns.heatmap(corr_mat, cbar=True, annot=True, square=True, fmt='.2f',annot_kws={'size': 15}, yticklabels=eda_colnms, xticklabels=eda_colnms) 
>>> plt.show() 
主站蜘蛛池模板: 高要市| 白银市| 唐河县| 丁青县| 宕昌县| 台北市| 华宁县| 桂东县| 浦东新区| 大同县| 昭通市| 柞水县| 平塘县| 巴林右旗| 建宁县| 安徽省| 漳浦县| 定结县| 兴安盟| 抚州市| 温州市| 祁门县| 东丽区| 毕节市| 旌德县| 花莲县| 新乡市| 四平市| 潞西市| 盐边县| 家居| 肃南| 山阴县| 双桥区| 昌吉市| 崇义县| 都兰县| 胶州市| 大荔县| 成武县| 五大连池市|