i want to calculate correlation coefficients for some dataseries.
The first groupwise representation is shown below. All datapoints are clustered into groups, if they are fulfilling specific attributes. Datapoints without any group are in orange. The functions between y and x can be seen groupwise (y=x^2 for blue and yellow, and a small-regional circleplot for purple and green).
The calculated correlation coefficients are -0.87, -0.89, -0.25 and -0.05. This is comprehensible regarding the data in the plot.
Therefore I was using the corrcoef function.
For another dataset, same procedure is done.
There arent any functional relations (in my opinion), but the correlation coefficients are -0.86 0.78 for example.
I didnt get these high correlation regarding this plot. What function can I use to directly decide if one group of points is correlating or not?