R - 1. Semester at Universität des Saarlandes

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Exemplary flashcards for R - 1. Semester at the Universität des Saarlandes on StudySmarter:

einfache Kreuztabelle

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Deskriptivstatistik basics

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Daten anschauen

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absolute Häufigkeiten anschauen

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YAML Header

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Schrift in R ändern

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Chunks

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R Notebooks

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Variablennamen ändern

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Symbole chunk

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R Objekte

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Teildatensatz -spezielle Vs auswählen

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Exemplary flashcards for R - 1. Semester at the Universität des Saarlandes on StudySmarter:

R - 1. Semester

einfache Kreuztabelle

desr::crosstab(data$fit.f, data$geschl.f)

R - 1. Semester

Deskriptivstatistik basics

- skim(daten) -> unübersichtl. bei      großem   Datensatz

  skim(daten$variable) -> eine Variable


- psych::describe(daten)

  psych::describe(daten$variable)


alternativ: Teildatensatz


R - 1. Semester

Daten anschauen

view(datensatz)

glimpse(datensatz)

R - 1. Semester

absolute Häufigkeiten anschauen

table(variable) 

-> kleiner Output mit Infos wie häufig kommt etw vor

R - 1. Semester

YAML Header

Meta Infos: Bsp:

- title:

- author:

- date:

- Output: html_notebook

optional zusätzl.Inhaltsverzeichnis

R - 1. Semester

Schrift in R ändern

#(##) Üschrift

*…* kursiv

**….** fett

'....' Code

R - 1. Semester

Chunks

entweder '''....''' oder insert R

- am Anfang geschwungene Klammer

- eine zeile ausführen STRG enter 

R - 1. Semester

R Notebooks

- Kopfbereich (YAML-Header)

- Textbereich

- Code-Abschnitte: Chunks 

R - 1. Semester

Variablennamen ändern

- colnames(datenobjekt) <- c("var.1.neu", "var2.neu",...."varx.neu") (pranktischer wenn viele Vs

- peket dplyr:

datenobjekt <- dplyr:: rename(datenobjekt, var1.name.neu = var1.name.alt, var2.name.neu = var2.name.alt)

-> Ersparnis wenn nur einzelne variablen geändert

R - 1. Semester

Symbole chunk

== gleich

!= ungleich

sqrt(x) Quadratwurzel

^ Potenz 

R - 1. Semester

R Objekte

- anlegen: Objektname <- (Alt -) Funktion(Argumente)

- entfernen: rm(Objektname)

R - 1. Semester

Teildatensatz -spezielle Vs auswählen

Sub <- select(daten, contains("DE"))

oder -contains("DE")

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