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Samenvatting LU Toetsende Statistiek R-studio spiekbrief $5.83
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Samenvatting LU Toetsende Statistiek R-studio spiekbrief

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Ik heb deze spiekbrief gemaakt voor mijn R tentamen (praktisch tentamen) toetsende statistiek (psychologie, leiden universiteit) en hiermee een 8,8 gehaald. Ik hoop dat het duidelijk is en ik je hiermee kan helpen. Mocht je vragen of feedback hebben, dan hoor ik het graag!

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  • December 8, 2024
  • 12
  • 2023/2024
  • Summary
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R commands handleiding
Legenda
Standaard uitleg
Code
Onderschrift van een code met uitleg
Plek van code waar je zelf de juiste naam of waarde moet
invulllen

Inhoudsopgave
Legenda............................................................................................................................................................1

Periode 1....................................................................................................................................................... 2
Basics....................................................................................................................................................................2
Project/script aanmaken.................................................................................................................................2
Data inladen.....................................................................................................................................................2
Simpele berekeningen.....................................................................................................................................2
Basic commands..............................................................................................................................................2
Frequentietabellen...............................................................................................................................................3
Grafieken..............................................................................................................................................................4
Variantie en standaarddeviatie............................................................................................................................5
Beschrijvende statistieken....................................................................................................................................5
Normaalverdeling en gestandaardiseerde scores................................................................................................5
Scatterplots..........................................................................................................................................................6
Covariantie en Pearson R.....................................................................................................................................6
Formule opbouwen.........................................................................................................................................6
Covariantie berekenen....................................................................................................................................6

Periode 2....................................................................................................................................................... 7
Hypothese toetsen voor gemiddelden.................................................................................................................7
Nieuwe Basics..................................................................................................................................................7
t-toets uitvoeren..............................................................................................................................................8
Betrouwbaarheidsintervallen, Effectmaten en Power.........................................................................................9
Niet-Parametrische Methoden en Resampling....................................................................................................9
Chi-kwadraattoetsen..........................................................................................................................................10

Periode 3..................................................................................................................................................... 11
Packages gebruiken in R....................................................................................................................................11
Data exploratie voor éénweg ANOVA in R.........................................................................................................11
Eenweg ANOVA in R...........................................................................................................................................11
ANOVA als lineair model................................................................................................................................11

, Periode 1
Basics

Project/script aanmaken
Project aanmaken
File > new project > new directory > new project > naam geven > browse naar P schijf >
create project

Script aanmaken
File > New File > R Script

Script opslaan
Save icoon linksboven: Let op de naam en de map!

Data inladen
Data toevoegen aan project
Kopieer bestanden naar de project map > Open R studio > Open het project > voeg data toe
aan Environment

Data toevoegen aan environment
Ga rechtsonder naar de tab files en klik op de data die je wilt toevoegen > bevestig dat je dit
object in R studio wilt laden > zie dat een object “naam van de data die je hebt toegevoegd” is
toegevoegd aan environment

Simpele berekeningen
Som: sum(x) of +
Vervang x voor een object of waarde
Aftrekken: -
Delen: /
Vermenigvuldigen: *
Kwadrateren: ^
Worteltrekken: sqrt(x)
Vervang x voor een object of waarde

Basic commands
Tekst in script typen: Gebruik een # (bijvoorbeeld #tekst)
Help: `?` (na de ? hetgeen waar je een vraag over hebt)
Run: Ctrl + Enter (Windows) of Cmnd + Enter (Mac)
Print (=tonen):
Toont de variabelen in de vector/ het object
print(DataSet)
Vul de dataset of het object in

Lengte bepalen

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