Statistics for Psychologists with R: An Introduction

Dominique Makowski

This course is supported by the École de Neuropsychologie group.

About the course

Course Status
Length ≈ ...min

This course was crafted by psychologists, neuropsychologists and neuroscientists for psychologists, neuropsychologists and neuroscientists. As such, it is a straightforward introduction to R with a special focus on how to get some actual results with it. It is not a programming course on R, nor a course on statistics per se.

Note that there are other more complete tutorials teaching R for psychological research (such as this one or my favourite one).

Contact

For remarks, complaints, suggestions or anything else, you can contact the creator of this course via Linkedin, email (dom.makowski@gmail.com) or by creating an issue on this repository.

The Pipe Operator %>%

Create Variables

  • On the fly

  • mutate()

Rename Variables, Levels and Relevel

  • rename()

  • factor(labels=) [rename levels]

  • factor(levels=) [reorder levels]

Arrange

  • arrange()
  • spread()
  • separate()

Select and Filter

  • select()
  • ends_with() = Select columns that end with a character string
  • contains() = Select columns that contain a character string
  • matches() = Select columns that match a regular expression
  • one_of() = Select columns names that are from a group of names
  • num_range(x, i:j)
  • filter()
  • (>, <, >=, <=, !=, %in%)
  • (&, |)

Group by

  • group_by()
  • summarise()
  • n()

Reshape

tidyr

  • gather()
  • separate()
  • spread(df, levels_to_columns, values)

Merge

  • full_join()
  • bind_rows()
  • bind_cols()