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LATEST EDITS: 11th of May 2026: The field for stating desired alpha in the calculators did only accept integers. This glitch is now fixed. --- 8th of May 2026: The calculators accepted entering p-values below 0 and above 1. This glitch is now fixed. --- 2nd of May 2026: An introductory video explaining the difference between the p-value and the level of significance was added. Furthermore two online calculators were added.
This web-page provides an introduction to the concept of etiologic predictive value (EPV). Reading this webb page will give you an understanding of the concept EPV and how to use…
This web-page provides an introduction to the software G*Power used to estimate sample size. Reading this will give you enough knowledge to be able to try doing simple things in…
This web-page describes how to properly round up figures when you want to present your results. It is all about understanding the concept of precision. Reading this will give you…
This web page describes the most important cornerstones of Western philosophy of science. It is not complete and, if necessary, will be supplemented and revised. Philosophy of science is based…
Reading this page will give you an understanding of what standard (classical) linear regression is and how to perform the analysis in the statistical software SPSS (the process is similar…
Suggested pre-readingWhat this web page adds Introduction to statistics Observations and Variables This web-page describes the utterly important process of cleaning data before commencing descriptive or inferential statistical analysis. Data usually…
Reading this web site and watching the embedded videos will help you get started with using the statistical software IBM SPSS. Recommended prereading are the pages Introduction to statistics, Observations…
Suggested pre-reading What this web page adds Study design This web page clarifies briefly the different options to analyse data in randomized controlled trials. Reading this page will make you…
Suggested pre-reading What this web page adds Introduction to statistic Choosing statistical analysis This web-page describes what survival analysis is. Reading this will give you an understanding of what survival…