After verifying that there is no one missprint in the data and before starting the true statistical analysis, I check the distribution of data and relationships between factors.

Actually I analyse data from a thesis which measure urbanisation’s influence on physicochemical characteristics. The PhD student sample water once by month during 2017 at seven spots around a lake.
I think it is a nice occasion to explain how I check the data when I received them.

In 2015, I published the article: Is oxidative status influenced by dietary carotenoid and physical activity after moult in the great tit (Parus major)? about my first experimentation. In the aim to investigate on the relationship between dietary carotenoids, physical activity and oxidative status, I captured great tits and kept them in aviaries.
Initially, a cross design: with/without dietary carotenoids and with/without plucking primary feathers (to increase physical activity or not), was…