How To Get A Regression Summary In Scikit Learn Like R Does

How to get a regression summary in scikit-learn like R does?

Tags: python , r , linear-regression , scikit-learn , summary Answers: 1 | Viewed 97,491 times



As an R user, I wanted to also get up to speed on scikit.


Creating a linear regression model(s) is fine, but can't seem to find a reasonable way to get a standard summary of regression output.


Code example:


# Linear Regression
import numpy as np
from sklearn import datasets
from sklearn.linear_model import LinearRegression
# Load the diabetes datasets
dataset = datasets.load_diabetes()
# Fit a linear regression model to the data
model = LinearRegression()
model.fit(dataset.data, dataset.target)
print(model)
# Make predictions
expected = dataset.target
predicted = model.predict(dataset.data)
# Summarize the fit of the model
mse = np.mean((predicted-expected)**2)
print model.intercept_, model.coef_, mse,
print(model.score(dataset.data, dataset.target))

Issues:



  • seems like the intercept and coef are built into the model, and I just type print (second to last line) to see them.

  • What about all the other standard regression output like R^2, adjusted R^2, p values, etc. If I read the examples correctly, seems like you have to write a function/equation for each of these and then print it.

  • So, is there no standard summary output for lin. reg. models?

  • Also, in my printed array of outputs of coefficients, there are no variable names associated with each of these? I just get the numeric array. Is there a way to print these where I get an output of the coefficients and the variable they go with?


My printed output:


LinearRegression(copy_X=True, fit_intercept=True, normalize=False)
152.133484163 [ -10.01219782 -239.81908937 519.83978679 324.39042769 -792.18416163
476.74583782 101.04457032 177.06417623 751.27932109 67.62538639] 2859.69039877
0.517749425413

Notes: Started off with Linear, Ridge and Lasso. I have gone through the examples. Below is for the basic OLS.



Asked by mpg

Answers:

eickenberg eickenberg answer at 2014-10-12 52



There exists no R type regression summary report in sklearn. The main reason is that sklearn is used for predictive modelling / machine learning and the evaluation criteria are based on performance on previously unseen data (such as predictive r^2 for regression).


There does exist a summary function for classification called sklearn.metrics.classification_report which calculates several types of (predictive) scores on a classification model.


For a more classic statistical approach, take a look at statsmodels.


* The answers/resolutions are collected from stackoverflow, are licensed under CC BY-SA 3.0

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