Koefisien determinasi

Koefisien determinasi adalah ukuran seberapa baik garis regresi linear menyesuaikan nilai yang diamati. Untuk regresi linear sederhana, nilainya sama dengan kuadrat korelasi antara variabel penjelas dan variabel respons.

Di sini, Anda akan kembali melihat tahap kedua dari pipeline periklanan: memodelkan respons klik terhadap impresi. Tersedia dua model: mdl_click_vs_impression_orig memodelkan n_clicks terhadap n_impressions. mdl_click_vs_impression_trans adalah model yang ditransformasikan yang Anda lihat di Bab 2. Model tersebut memodelkan n_clicks ^ 0.25 terhadap n_impressions ^ 0.25.

broom sudah dimuat.

Latihan ini adalah bagian dari kursus

Pengantar Regresi di R

Latihan interaktif praktis

Cobalah latihan ini dengan menyelesaikan kode contoh berikut.

# Print a summary of mdl_click_vs_impression_orig
___

# Print a summary of mdl_click_vs_impression_trans
___

Edit dan Jalankan Kode

Latihan ini adalah bagian dari kursus

Pengantar Regresi di R

SkillTag.level.intermediateSkillTag.label

4.8+

Mulai Kursus Gratis

You’ll learn the basics of this popular statistical model, what regression is, and how linear and logistic regressions differ. You’ll then learn how to fit simple linear regression models with numeric and categorical explanatory variables, and how to describe the relationship between the response and explanatory variables using model coefficients.

Exercise 1: A tale of two variables Exercise 2: Which one is the response variable?Exercise 3: Visualizing two variables Exercise 4: Fitting a linear regression Exercise 5: Estimate the intercept Exercise 6: Estimate the slope Exercise 7: Linear regression with lm()Exercise 8: Categorical explanatory variables Exercise 9: Visualizing numeric vs. categorical Exercise 10: Calculating means by category Exercise 11: lm() with a categorical explanatory variable

In this chapter, you’ll discover how to use linear regression models to make predictions on Taiwanese house prices and Facebook advert clicks. You’ll also grow your regression skills as you get hands-on with model objects, understand the concept of "regression to the mean", and learn how to transform variables in a dataset.

Exercise 1: Making predictions Exercise 2: Predicting house prices Exercise 3: Visualizing predictions Exercise 4: The limits of prediction Exercise 5: Working with model objects Exercise 6: Extracting model elements Exercise 7: Manually predicting house prices Exercise 8: Using broom Exercise 9: Regression to the mean Exercise 10: Home run!Exercise 11: Plotting consecutive portfolio returns Exercise 12: Modeling consecutive returns Exercise 13: Transforming variables Exercise 14: Transforming the explanatory variable Exercise 15: Transforming the response variable too

In this chapter, you’ll learn how to ask questions of your model to assess fit. You’ll learn how to quantify how well a linear regression model fits, diagnose model problems using visualizations, and understand the leverage and influence of each observation used to create the model.

Exercise 1: Mengkuantifikasi kecocokan model Exercise 2: Koefisien determinasi

Latihan Saat Ini

Exercise 3: Residual standard error Exercise 4: Memvisualisasikan kecocokan model Exercise 5: Residual versus nilai taksiran Exercise 6: Plot Q-Q dari residual Exercise 7: Scale-location Exercise 8: Membuat plot diagnostik Exercise 9: Pencilan, leverage, dan pengaruh Exercise 10: Leverage Exercise 11: Pengaruh (Influence)Exercise 12: Mengekstrak leverage dan pengaruh

Learn to fit logistic regression models. Using real-world data, you’ll predict the likelihood of a customer closing their bank account as probabilities of success and odds ratios, and quantify model performance using confusion matrices.

Exercise 1: Why you need logistic regression Exercise 2: Exploring the explanatory variables Exercise 3: Visualizing linear and logistic models Exercise 4: Logistic regression with glm()Exercise 5: Predictions and odds ratios Exercise 6: Probabilities Exercise 7: Most likely outcome Exercise 8: Odds ratio Exercise 9: Log odds ratio Exercise 10: Quantifying logistic regression fit Exercise 11: Calculating the confusion matrix Exercise 12: Measuring logistic model performance Exercise 13: Accuracy, sensitivity, specificity Exercise 14: Congratulations