April 2025
Intermediate to advanced
578 pages
13h 35m
Portuguese (Portugal, Brazil)
library(tidyverse)
Content preview from R for Data Science, 2ª Edição
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Capítulo 5. Tidy dos dados
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Introdução
"As famílias felizes são todas iguais; cada família infeliz é infeliz à sua maneira." -Leo Tolstoi
"Os conjuntos de dados Tidy são todos iguais, mas cada conjunto de dados confuso é confuso à sua maneira." -Hadley Wickham
Neste capítulo, aprenderás uma forma consistente de organizar os teus dados em R usando um sistema chamado Tidy Data. Colocar os teus dados neste formato requer algum trabalho inicial, mas esse trabalho compensa a longo prazo. Assim que tiveres os dados tidy e as ferramentas tidy fornecidas pelos pacotes do tidyverse, passarás muito menos tempo a mudar os dados de uma representação para outra, permitindo-te passar mais tempo com as questões de dados que te interessam.
Neste capítulo, começa por aprender a definição de dados Tidy e vê a sua aplicação a um conjunto de dados simples. Depois, vamos mergulhar na principal ferramenta que vais utilizar para Tidy: a dinamização. A dinamização permite-te alterar a forma dos teus dados sem alterar nenhum dos valores.
Pré-requisitos
Neste capítulo, vamos concentrar-nos no tidyr, um pacote que fornece um conjunto de ferramentas para ajudar a arrumar os teus conjuntos de dados confusos. tidyr é um membro do núcleo do tidyverse.
A partir deste capítulo, vamos suprimir a mensagem de carregamento do library(tidyverse).
Tidy Data
Podes representar ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.