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R in a Nutshell
book

R in a Nutshell

by Joseph Adler
May 2012
Intermediate to advanced
768 pages
29h 21m
German
O'Reilly Verlag
Content preview from R in a Nutshell

Modelle und Formeln

Im Verständnis von Statistikern ist ein Modell eine Möglichkeit, einen Datensatz (oder ein Auswertungszenario) mithilfe einer mathematischen Formel in knapper Form zu beschreiben. Manchmal ist das Ziel, ein prädiktives Modell aufgrund von Trainingsdaten aufzustellen. Bei anderen Gelegenheiten besteht das Ziel darin, ein deskriptives Modell zu formulieren, das dabei hilft, die Daten besser zu verstehen.

Zur Beschreibung der Beziehung zwischen Variablen gibt es in R eine spezielle Notation. Nehmen wir an, Sie gehen für die Variable y von einem linearen Zusammenhang aus, der aus den Variablen x1, x2, ..., xn vorhergesagt wird. (Statistiker bezeichnen y normalerweise als abhängige Variable, x1, x2, ..., xn sind die unabhängigen ...

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Publisher Resources

ISBN: 9783868992854Purchase book