Eckhard Bick - VISL

(5a), continued
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number of
contexts
morf syn map all
morf0 morf1 morf2 morf3 syn0 syn1 syn2 syn3
+3 18 - - - 1 - - - 10 29
+3C 4 2 - - 1 - - - - 7
NOT 3 3 - - - 1 - - - 2 6
all +3 25 3 12 42
C-percent 28.0 66.7 20.0 31.0
-3 50 5 - 1 7 - - - 61 124
-3C 24 1 - 1 2 - - - 10 38
NOT -3 12 1 - 1 5 - - - 2 21
all -3 86 14 73 183
C-percent 42.4 50.0 17.8 32.2
+4 8 - - - - - - - 1 9
+4C 8 - - - - - - - - 8
NOT 4 4 - - - 1 - - - - 5
all +4 20 1 1 22
C-percent 60.0 - - 59.1
-4 24 1 - - - - - - 10 35
-4C 4 1 - - - - - - - 5
¢
NOT ¢ £
-4 1 - - - 7 - - - - 8
all -4 29 7 10 48
C-percent 17.2 - - 27.1
all + 318 96 2 2 130 15 8 - 272 843
all +C 395 55 1 - 53 1 - - 4 509
all NOT + 251 72 4 3 77 12 2 - 143 664
all + 964 260 419 2016
C-percent 67.0 50.0 35.1 58.2
all - 605 131 23 18 227 35 1 - 723 1761
all -C 507 70 - 7 64 5 - - 28 681
all NOT - 372 121 14 9 108 23 - - 90 737
all - 1484 399 841 3197
C-percent 59.2 43.1 14.0 44.9
Looking at absolute positions first, the following observations can be made:
(a) The C-percent parameter is higher for morphological than for syntactic rules,
and lowest for mapping rules.
This fact reflects the order in which disambiguation is performed in progressive
level parsing, morphology first, then syntax. Thus, the amount of unambiguous context
(where no certainty restrictions are necessary) increases from level to level. In
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