Gemiddelden per categorie berekenen

Een goede manier om categorische variabelen te verkennen is door samenvattende statistieken, zoals het gemiddelde, per categorie te berekenen. Hier bekijk je gegroepeerde gemiddelden voor de huizenprijzen in de Taiwan real estate-gegevensset.

taiwan_real_estate is beschikbaar en dplyr is geladen.

Deze oefening maakt deel uit van de cursus

Introductie tot regressie in R

Cursus bekijken

Oefeninstructies

Groepeer taiwan_real_estate op house_age_years.
Vat samen om het gemiddelde van price_twd_msq per groep te berekenen, en noem de kolom mean_by_group.
Wijs het resultaat toe aan summary_stats en bekijk de getallen.

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

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

Code bewerken en uitvoeren

Deze oefening maakt deel uit van de cursus

Introductie tot regressie in R

SkillTag.level.intermediateSkillTag.label

4.8+

Begin de cursus 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: Een verhaal van twee variabelen Exercise 2: Welke is de responsvariabele?Exercise 3: Twee variabelen visualiseren Exercise 4: Een lineaire regressie fitten Exercise 5: Schat de intercept Exercise 6: Schat de helling Exercise 7: Lineaire regressie met lm()Exercise 8: Categorische verklarende variabelen Exercise 9: Numeriek vs. categorisch visualiseren Exercise 10: Gemiddelden per categorie berekenen

Huidige oefening

Exercise 11: lm() met een categorische verklarende variabele

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