Encoding missing values

[Subhash Kak]

Missing values in feedback networks raise interesting questions:
Should these values be considered "don't know" values or should 
these be generated in some "most likelihood" fashion? These issues
are discussed in the following paper:

S.C. Kak, "Feedback neural networks: new characteristics and a
generalization", Circuits, Systems, Signal Processing, vol. 12,
no. 2, 1993, pp. 263-278.

-Subhash Kak