# Sitemap

A list of all the posts and pages found on the site. For you robots out there is an XML version available for digesting as well.

## Cheat sheet

A flexible two-column Jekyll theme. Perfect for personal sites, blogs, and portfolios hosted on GitHub or your own server. Latest release v4.9.1

## Base R - no statistics, no fancy packages, just plain R

Learn the essentials for working with R.

## Splash Page

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## Introduction

Setting up R and auxiliary programs for operating R and introducing a few tools if you get stuck.

## Installation

How to install R and RStudio?

## User Interface

What is what in RStudio.

## First Steps in R

Making your first steps in R with simple arithmetic operations.

## ?Help()?!

What to do if you get lost in R?

## R Help-Files?!

What to do if you get lost in R?

## Summary

What to do if you get lost in R?

## Introduction

Learn about different levels of measurements and how information is arranged in data types in R.

## Levels of Measurement

The Four Horsemen of Measurement - hear their names: Nominal, Ordinal, Interval, Ratio.

## Qualitative Data

The Four Horsemen of Measurement - hear their names: Nominal, Ordinal, Interval, Ratio.

## Quantitative Data

You already know about (non-numerical or categorical) qualitative data. But when you do have numbers, you have got quantitative data. Quantitative Data (“nu...

## Summary

Summary The Four Types of Data: nominal, ordinal, interval and ratio. Remember that the top-level category is eithe...

## DataCamp Exercise

It is time for DATA CAMP exercises!

## Introduction to data types and objects

You will learn about different types of data storing in objects.

## Exercise 1

Try yourself in Exercise 1!

## Solution to Exercise 1

See if you were right in exercise 1!

Test

## Introduction

You will learn how to access the indices.

Test

## Introduction

You will learn how to set up the working environment

## Installing Packages in R

“Good things come in small packages.” — Proverb

## Introduction to CSV

You will learn what a csv file is and how to use it in a dataframe.

## CSV

“Torture the data, and it will confess to anything.” – Ronald Coase

## Introduction to loops

You will learn what operators and loops do and how to write a if-then-else construct.

## Operators

“Data is the new oil.” — Clive Humby

## Decisions and Loops

Decision structures are like junctions in the analysis workflow and decide which way to go during runtime. Loops are the workhorses for repeating the same co...

## For-loops

For-loops are the mother of all repeating structures which enable the execution of certain code blocks for multiple times. For-loops are useful if the number...

## Loop and Conquer

This worksheet provides some control structure and loop examples to help you getting familiar with these probably most important properties of any programmin...

## Lapply-loops

As examples for the apply family we shortly introduce lapply. Basic structure The lapply function can be your workhorse when it comes to loops over data fra...

## If-then-else

If-then-else statements are the controlling structures in each program. The simplest form is: a <- 5.0 b <- 10.0 if (a < b) { print("a is smaller...

## While-loops

As for loops, while loops are repeating structures which enable the execution of certain code blocks for multiple times. The difference is that for while loo...

## Intoduction

At the end of this unit you should know how to sort bind merge specific datum in vectors, lists, matrices and data.frames. Comments? You can leave c...

## Sorting

“It is a capital mistake to theorize before one has data.” — Sherlock Holmes

## Binding

“In God we trust, all others bring data.” — W Edwards Deming

## Merging

To merge two data frames, you have to specify the column containing the values which should be used in the matching. In this example, we use the values of th...

## Creating graphs

“No design works unless it embodies ideas that are held common by the people for whom the object is intended.” - Adrian Forty

## Dotplot

What is a Dotplot? Short Version: A dot plot is just a bar chart that uses dots to represent individual quanta. Long Version: A Dot Plot, also called a...

## Boxplot

What is a Boxplot? The box plot (also box-whisker plot) is a diagram used to graphically represent the distribution of a characteristic that is at least o...

## Line Chart

What is a Line Chart? A line chart is the graphical representation of the functional relationship of two (with 2D representation) or three (with 3D repr...

## Scatterplot

What is a Scatterplot? A scatter plot is a graphical representation of observed pairs of values of two statistical characteristics. These pairs of values ...