Calcolare le medie per categoria

Un buon modo per esplorare le variabili categoriche è calcolare statistiche di sintesi come la media per ciascuna categoria. Qui esaminerai le medie raggruppate per i prezzi delle case nel dataset immobiliare di Taiwan.

taiwan_real_estate è disponibile e dplyr è caricato.

Questo esercizio fa parte del corso

Introduzione alla regressione in R

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Istruzioni dell'esercizio

Raggruppa taiwan_real_estate per house_age_years.
Riassumi per calcolare la media di price_twd_msq per ogni gruppo, chiamando la colonna mean_by_group.
Assegna il risultato a summary_stats e dai un'occhiata ai numeri.

Esercizio pratico interattivo

Prova a risolvere questo esercizio completando il codice di esempio.

summary_stats <- taiwan_real_estate %>% 
  # Group by house age
  ___ %>% 
  # Summarize to calculate the mean house price/area
  ___(mean_by_group = ___)

# See the result
summary_stats

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Questo esercizio fa parte del corso

Introduzione alla regressione in R

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4.8+

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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: Una storia di due variabili Exercise 2: Qual è la variabile di risposta?Exercise 3: Visualizzare due variabili Exercise 4: Adattare una regressione lineare Exercise 5: Stima l'intercetta Exercise 6: Stima la pendenza Exercise 7: Regressione lineare con lm()Exercise 8: Variabili esplicative categoriche Exercise 9: Visualizzare numerico vs. categorico Exercise 10: Calcolare le medie per categoria

Esercizio in corso

Exercise 11: lm() con una variabile esplicativa categorica

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: Quantifying model fit Exercise 2: Coefficient of determination Exercise 3: Residual standard error Exercise 4: Visualizing model fit Exercise 5: Residuals vs. fitted values Exercise 6: Q-Q plot of residuals Exercise 7: Scale-location Exercise 8: Drawing diagnostic plots Exercise 9: Outliers, leverage, and influence Exercise 10: Leverage Exercise 11: Influence Exercise 12: Extracting leverage and influence

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