November 2017
Intermediate to advanced
502 pages
11h 21m
German
Content preview from R für Data ScienceBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
KAPITEL 10
Relationale Daten mit dplyr
Einführung
Selten ist bei einer Datenanalyse nur eine einzige Datentabelle beteiligt. In der Regel haben Sie es mit vielen Datentabellen zu tun, und Sie müssen sie miteinander verknüpfen, um die anstehenden Fragen zu beantworten. Man spricht hierbei von relationalen Daten, weil ihre Beziehungen (Relationen) zueinander und nicht nur die individuellen Datensets wichtig sind.
Beziehungen werden immer zwischen einem Paar von Tabellen definiert. Alle anderen Beziehungen bauen auf diesem einfachen Konzept auf: Die Beziehungen von drei oder mehr Tabellen sind immer eine Eigenschaft der Beziehungen zwischen jedem Paar. Manchmal können beide Elemente eines Paars dieselbe Tabelle sein! Dies ist zum Beispiel notwendig, ...
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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.