In the last article, we have illustrated the concept of statistical tests. If you only want to obtain a rough understanding of the concept behind statistical tests then reading our last article is absolutely sufficient. However, if you are interested in more detail, then the following will help you to understand how a p-value is calculated and what “degrees of freedom” means.
When you do your first statistical tests you may get the impression that doing statistics is complicated. In this article we want to show that the principle of statistical testing is actually relatively simple.
When presenting the findings of a study people often don’t show the original data that were measured, but they create so called ‘derived data’. Derived data can be: Percentages, rates, rtios, indices, etc.. For example, considering a data set on smoking behaviour, percentages could be used to describe the proportion of smokers in a sample…
When you do statistical analyses, the knowledge about data type is very important, because many statistical methods and tests were specifically designed for a specific data type. However, there is a lot of confusion regarding data type, because many different terms are used…
The new version of GGS includes a number of new, exciting features that make analyses easier and efficient. Here is a summary of the main new features. New statistical guide The statistical guide, featuring a new flowchart to guide you through the test selection. If at any step you feel...
Why are there so many tests? If you need to conduct statistical testing for your thesis or your first paper you might be overwhelmed by the large quantity of statistical tests. Why are so many available? How do I choose and how can I be sure to have selected the...
It can be intimidating to read across statistical text books, trying to find the correct statistical analysis for a study. And since statistics is such a large field, it is often difficult to understand when to use which analysis or test. We understand that scientists want to conduct appropriate statistics,...
Overview Dose-response curves are use used to describe the relation of dose (e.g. of a pharmaceutical) and the resulting effect. To do this, dose response functions are fitted to measured data. These functions can then be used to calculate of important benchmarks such as the EC50 (dose leading to 50...