March 2018
Intermediate to advanced
528 pages
13h 2m
Portuguese (Portugal, Brazil)
Content preview from R para Data Science
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CAPÍTULO 10
Dados Relacionais com dplyr
Introdução
É raro que a análise de dados envolva uma única tabela de dados. Normalmente você
tem muitas tabelas e deve combiná-las para responder às perguntas que lhe interessam.
Coletivamente, várias tabelas de dados são chamadas de dados relacionais, porque
são as relações, não apenas os conjuntos de dados individuais, que são importantes.
Relações são sempre definidas entre um par de tabelas. Todas as outras relações são
construídas a partir desta ideia simples: as relações de três ou mais tabelas são sempre
uma propriedade das relações entre cada par. Às vezes, ambos os elementos de um par
podem ser ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.