[caf]

For valuing Scrabble tiles, Valett also needs to include the representation of the letter in common prefixes and suffixes that can be prepended or appended to existing words. I believe that one reason that G is so playable is the common -ING suffix.

[DLWormwood]

I believe that is part of what his definition of “ingoing and outgoing entropy” is refering to. That said, it does seem weird to heavily bias for the 2-3 letter and 7-8 cases. I would think the moderate length words should not get such short shrift, since these words tend to be the ones used to determine when the various letter and words value tiles get hit in any given game. (Full disclosure: not a regular Scrabble player.)

[zem]

regular scrabble player here. 2, 3, 7 and 8 are absolutely way more valuable than all the other lengths.