Referenties en links

[1] Use = or <- for assignment?

Revolution Analytics, 2008

http://blog.revolutionanalytics.com/2008/12/use-equals-or-arrow-for-assignment.html

[2] Logical operators in R

R-bloggers

http://www.r-bloggers.com/logical-operators-in-r/

[3] Data Import

Chi Yau, 2016

http://www.r-tutor.com/r-introduction/data-frame/data-import

[4] R Library: Matrices and matrix computations in R

IDRE

http://www.ats.ucla.edu/stat/r/library/matrix_alg.htm

[5] Factor variables

Bruin, 2006

http://www.ats.ucla.edu/stat/r/modules/factor_variables.htm

[6] Sorting data

Kabacoff,

http://www.statmethods.net/management/sorting.html

[7] Exploratory Data Analysis: Variations of Box Plots in R for Ozone Concentrations in New York City and Ozonopolis

Eric Cai - RBloggers, 2013

http://www.r-bloggers.com/exploratory-data-analysis-variations-of-box-plots-in-r-for-ozone-concentrations-in-new-york-city-and-ozonopolis/

[8] Correlatiecoëfficiënt

M Zandee, 2006

http://www.mzandee.nl/statistiek/syllabus/correlatiecoëfficiënt.shtml

[9] Operators

Kabacoff, 2014

http://www.statmethods.net/management/operators.html

[10] A Tutorial on Loops in R - Usage and Alternatives

Fanara, 2015

https://www.datacamp.com/community/tutorials/tutorial-on-loops-in-r

[11] Help topics

ggplot2

http://docs.ggplot2.org/current/

[12] Data visualization with ggplot2

ggplot2

https://www.rstudio.com/wp-content/uploads/2015/03/ggplot2-cheatsheet.pdf

[13] Data Visualization with ggplot2

Datacamp

https://www.datacamp.com/courses/data-visualization-with-ggplot2-1

[14]Textual annotations

ggplot2

http://docs.ggplot2.org/current/geom_text.html

[15] Dataportaal van de Nederlandse overheid

Dataportaal van de Nederlandse overheid

https://data.overheid.nl/

[16] json-schema.org

json-schema.org

http://json-schema.org/example1.html