I have this scatter plot matrix among 3 variables/quantities:
In books/guides about scatter plots interpretations, I am not able to find anything like the plots (1,2) and (1,3) (or equivalently the plots (2,1) and (3,1)), where the correlation is not really clear to me. Any idea/suggestion? Are those variables in plots (1,2) and (1,3) simply uncorrelated or is there any kind of correlation? How to interpret them?
If helpful, I also depicted plots (1,2), (1,3) and (2,3) as follows:
- with non-normalised values (therefore not anymore with the 0 and 1 bounds as in the previous plot)
- with the Pearson, Spearman and Kendall's correlations
- both in a lin-lin scale and in a log-log scale