Rappresentare i risultati

Nei precedenti esercizi hai esaminato i dati grezzi, costruito un modello e usato il modello per fare inferenze statistiche. Hai scoperto che il farmaco 2 aumenta la quantità di sonno extra rispetto al farmaco 1. In questo esercizio, traccerai i risultati per vedere di quanto il farmaco 2 ha aumentato il sonno extra.

Per prima cosa, prepara i dati usando la funzione pivot_wider() del pacchetto tidyr. Poi calcola la differenza di sonno extra per ciascun individuo. Infine, rappresenta questa differenza con un istogramma.

Questo esercizio fa parte del corso

Modelli gerarchici e a effetti misti in R

Visualizza il corso

Esercizio pratico interattivo

Prova a risolvere questo esercizio completando il codice di esempio.

# Load the tidyr package
library(___)

# Make the data wider
___ <- 
	pivot_wider(sleep, 
                names_from = group, values_from = extra)

# Calculate the difference 
sleep_wide$___ <- sleep_wide$`2` - sleep_wide$`1`

Modifica ed esegui il codice

Questo esercizio fa parte del corso

Modelli gerarchici e a effetti misti in R

AvançadoNível de habilidade

4.7+

Inizia il corso gratis

The first chapter provides an example of when to use a mixed-effect and also describes the parts of a regression. The chapter also examines a student test-score dataset with a nested structure to demonstrate mixed-effects.

Exercise 1: What is a hierarchical model?Exercise 2: Examples of hierarchical datasets Exercise 3: Multi-level student data Exercise 4: Exploring multiple-levels: Classrooms and schools Exercise 5: Parts of a regression Exercise 6: Intercepts Exercise 7: Slopes and multiple regression Exercise 8: Random-effects in regressions with school data Exercise 9: Random-effect intercepts Exercise 10: Random-effect slopes Exercise 11: Building the school model Exercise 12: Interpreting the school model

This chapter providers an introduction to linear mixed-effects models. It covers different types of random-effects, describes how to understand the results for linear mixed-effects models, and goes over different methods for statistical inference with mixed-effects models using crime data from Maryland.

Exercise 1: Linear mixed effect model- Birth rates data Exercise 2: Building a lmer model with random effects Exercise 3: Including a fixed effect Exercise 4: Random-effect slopes Exercise 5: Uncorrelated random-effect slope Exercise 6: Fixed- and random-effect predictor Exercise 7: Understanding and reporting the outputs of a lmer Exercise 8: Comparing print and summary output Exercise 9: Extracting coefficients Exercise 10: Displaying the results from a lmer model Exercise 11: Statistical inference with Maryland crime data Exercise 12: Visualizing Maryland crime data Exercise 13: Rescaling slopes Exercise 14: Null hypothesis testing Exercise 15: Controversies around P-values Exercise 16: Model comparison with ANOVA

This chapter extends linear mixed-effects models to include non-normal error terms using generalized linear mixed-effects models. By altering the model to include a non-normal error term, you are able to model more kinds of data with non-linear responses. After reviewing generalized linear models, the chapter examines binomial data and count data in the context of mixed-effects models.

Exercise 1: Crash course on GLMs Exercise 2: Logistic regression Exercise 3: Poisson Regression Exercise 4: Plotting GLMs Exercise 5: Binomial data Exercise 6: Toxicology data Exercise 7: Marketing example Exercise 8: Calculating odds-ratios Exercise 9: Count data Exercise 10: Internet click-throughs Exercise 11: Chlamydia by age-group and county Exercise 12: Displaying chlamydia results

This chapter shows how repeated-measures analysis is a special case of mixed-effect modeling. The chapter begins by reviewing paired t-tests and repeated measures ANOVA. Next, the chapter uses a linear mixed-effect model to examine sleep study data. Lastly, the chapter uses a generalized linear mixed-effect model to examine hate crime data from New York state through time.

Exercise 1: Introduzione alle misure ripetute Exercise 2: t-test appaiato Exercise 3: ANOVA per misure ripetute Exercise 4: Studio sul sonno Exercise 5: Esplorare i dati Exercise 6: Costruire i modelli Exercise 7: Confrontare regressioni e ANOVA Exercise 8: Rappresentare i risultati

Esercizio in corso

Exercise 9: Odio nello stato di NY?Exercise 10: Esplorare i dati sui crimini d’odio a NY Exercise 11: Costruire il modello Exercise 12: Interpretare i risultati del modello Exercise 13: Visualizzare i risultati Exercise 14: Ripasso dei modelli gerarchici in R Exercise 15: Conclusione