Above are the results of running my new test on a series of plaintexts (pt) from Gutenberg.org enciphered with the cipher types shown. The number of pts was over 3000 in every case. The test clearly has some value in distinguishing cipher types based on the ct. However, as I analyzed the results, I see they are very similar to the Normor test and for a very simple reason. Both tests tend to measure the extent to which a cipher type enciphers pt with letters that have the same or similar frequency as the pt.
The Two-Square is a good example to understand this. Whenever both pt letters are on the same row, the resulting ct digraph is a reversal of those same two letters. Similarly, if one or both the left and right squares use vertical keywords, the resulting digraph is likely to contain a letter from the same keyword used for that vertical (column) key. For this reason, the Two-square ct tends to be closer to normal pt frequencies. When you consider how the other ciphers are constructed, it is not difficult to see that the numbers reflect this same phenomenon.
I believe this new test is simply another way of measuring the same thing the Normor test does. The real question is whether it does so more accurately and reliably, i.e. with finer, sharper separation between types. The data cts used here were enciphered with a random choice of keyword and route, but when I first invented the Normor test, I checked it on different polybius square routes. The results were strikingly different depending on the route chosen. Again, if you consider how some routes tend to cause the ct letter to be the same letter as the pt, or from the same keyword, and others don’t, especially where two different keysquares are used, this becomes understandable.