I should be less cryptic; being LII is no excuse. A proposed independent variable to which a bunch of observations are attached in the attempt to find some root correlation (to behaviour?) is what I call a classification bin (statisticians and psychologists have better words). A filter is a way of disregarding or accepting certain types of information or processes (resulting in F or T and S or N, which I call preferences). I question any model that uses Jung's observations as the starting point or basis for a system although the observations and classifications of behaviour by him are valid and can be used to verify a system. I think both Augusta and M-B used Jung as the starting point but failed to find (look for?) a system. Instead, patchwork was done. I was pushing further on your statement of "part of Jung and Augusta's thinking". I can now see how I lost you so I should stop here; I would need to produce another article for which I have little energy at the moment. I did not imply anything about rings?
a.k.a. I/O