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Table 2

Confusion matrix for preposition errors used in the artificial errors method. Based on the training data from the FCE corpus. The left column shows the correct preposition. Each row shows the author's preposition choices for that label and Prob(source|label). The numbers next to the targets show the count of the label (or source) in the data set. The table is based on the confusion matrix for 12 prepositions but only rows corresponding to eight most frequent prepositions are shown to make the table readable.

LabelSources
onforoftoatinwithby
(1,897)(3,995)(5,945)(3,897)(2,726)(6,367)(2,011)(625)
on (1,829) 0.852 0.020 0.014 0.008 0.012 0.076 0.008 0.002 
for (4,034) 0.002 0.939 0.019 0.018 0.001 0.007 0.001 0.001 
of (5,795) 0.002 0.004 0.974 0.001 0.001 0.009 0.002 0.001 
to (3,990) 0.004 0.015 0.010 0.936 0.007 0.018 0.008 
at (2,898) 0.011 0.002 0.007 0.009 0.889 0.076 0.002 0.001 
in (6,274) 0.040 0.003 0.011 0.003 0.013 0.924 0.002 0.001 
with (2,046) 0.002 0.008 0.009 0.009 0.002 0.015 0.933 0.009 
by (621) 0.008 0.010 0.011 0.002 0.008 0.008 0.934 
LabelSources
onforoftoatinwithby
(1,897)(3,995)(5,945)(3,897)(2,726)(6,367)(2,011)(625)
on (1,829) 0.852 0.020 0.014 0.008 0.012 0.076 0.008 0.002 
for (4,034) 0.002 0.939 0.019 0.018 0.001 0.007 0.001 0.001 
of (5,795) 0.002 0.004 0.974 0.001 0.001 0.009 0.002 0.001 
to (3,990) 0.004 0.015 0.010 0.936 0.007 0.018 0.008 
at (2,898) 0.011 0.002 0.007 0.009 0.889 0.076 0.002 0.001 
in (6,274) 0.040 0.003 0.011 0.003 0.013 0.924 0.002 0.001 
with (2,046) 0.002 0.008 0.009 0.009 0.002 0.015 0.933 0.009 
by (621) 0.008 0.010 0.011 0.002 0.008 0.008 0.934 
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