Thanks ZenMaster_Flash. I did see this posting, but my book of BBIBJ (copyright 2005) has tables that don't seem consistent with the tables he gives here (after multiplying the indices by 4). I think I'm missing a version!
You should generate your own indexes if you have CV-Data, if you'll private message me with your e-mail address I'll send you a complete set from +15 to -10 using Count Per Deck for Zen (Multiple Deck) including indexes for both late and early surrender. Just multiplying the True Edge indexes by 4 is not going to be very accurate.
You are not working the problem the right way. Dividing the indices by 4 to get the quarter deck estimate fractional indices will show you why the 1/4 deck is weak without the fractional indices. With the approach you took (multiplying the 1/4 deck by 4) you are simply taking the error slot for integer indices in 1/4 deck and forcing it to show up in full deck estimates. By working the problem the other way and getting fractional indices you can see why 1/4 deck has such poor performance by comparison. That doesn't even factor in the deck estimation accuracy issues which may or may not factor in depending on your skill level for 1/4 deck estimates.
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