Correlation

What is a correlaion? A correlation is a kind of relationship between two variables. It is a statistical value expressed in a correlation...

Random Forests

Like mentioned in the post about decision trees, the big challenge to face is overfitting. To adress the issue, a concept developed by Tin...

R - Simple Data Preparation

  R covers a huge variety of functions for data manipulation, reorganization and separation. Here are some of the commands I consider...

R - Packages and DataTypes

Packages Functionality is maintained in packages. Some packages are part of the basic functionality and are predefined when you install...

Null-Hypothesis, Z-Scores and Normal Distribution

This is Carl Friedrich Gauß, one of the most friendly looking German mathematicans, on a banknote. Nowadays Germany forms part of the European...

Null Hypothesis, P-Value and Significance Level

What is the null hypothesis? That's easy: It is the assumption, that an observation is simply due to chance. The contrary assumption,...

R - How to Start

  Welcome to a new challenge - an empty green meadow is waiting to be explored and developed! R is a pretty strange programming language,...