Fitting negative binomial

The negative binomial allows for the variance to exceed the mean, which is what you have measured in the previous exercise in your data crab. In this exercise you will recall the previous fit of the Poisson regression using the log link function and additionally fit negative binomial model also using the log link function.

You will analyze and see how the statistical measures were changed.

The model crab_pois and crab is loaded in your workspace.

Bu egzersiz

Generalized Linear Models in Python

kursunun bir parçasıdır

Kursu Görüntüle

Egzersiz talimatları

Define a formula for the regression model so that sat is predicted by width.
Fit the negative binomial using NegativeBinomial() and save the model as crab_NB.
Print the summaries of the Poisson model crab_pois and the newly fitted negative binomial model.

Uygulamalı interaktif egzersiz

Bu örnek kodu tamamlayarak bu egzersizi bitirin.

# Define the formula for the model fit
formula = '____ ~ ____'

# Fit the GLM negative binomial model using log link function
crab_NB = smf.glm(formula = ____, data = ____, 
				  family = ____.____.____).____

# Print Poisson model's summary
print(____.____)

# Print the negative binomial model's summary
print(____.____)

Kodu Düzenle ve Çalıştır