Scientific investigation in which data observed in clinical, experimental and epidemiological research are collected and evaluated. A good main study is based on a pilot study, and additionally secured by adequate statistical analysis. Compared with the pilot study the main study is
based on a larger collection of samples and a larger body of data.
One can discriminate between main studies which are based on hypotheses and purely descriptive main studies. In any case, a hypothesis stated in the experimental setup allows for especially well-defined statistical conclusions in the data analysis.
In the context of electromagnetic compatibility with the environment, the effects