Observational or experimental? Findings from confirmatory randomized trials are generally considered to represent a higher level of evidence than findings from observational studies. Manuscripts presenting randomized trials usually get more favourable evaluations and have lower chances of being rejected. Many authors of observational studies have recognized this phenomenon and try to use the knowledge in… Continue reading Observational or experimental?
Associations Two variables are associated, statistically dependent, if one of the variables says something about the other, and this can range from nothing to everything. Correlated variables are always dependent, but dependent variables are not necessarily correlated because correlation refers to linear relationships. It is, for example, easy to show that the two mathematically coupled… Continue reading Associations
Terminology In order to communicate without misunderstandings, it is important to realise that in contrast to spoken language, a combination of words; gestures; facial expressions; and with possibilities for immediate questioning and correcting, written language relies entirely on usage of the right words and compliance with the grammatical rules for combining these into understandable sentences… Continue reading Terminology