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Figure 5. Percentage of average cost saved vs. number of shortcuts recommended
Per c ent ag e c o st s aVed WITh 2-g r aM(90:10)
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COST SAVED %
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nuMBer o f s ho r t c ut s
Figure 6. Percentage of average cost saved vs. N
nasa dat aSeT(90:10)
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COST SAVED %
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-GRAM
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Pr edic t io n Mo de l
from 10 to 20. More importantly, it is not possible to display many shortcuts due to screen size limita-
tions of mobile devices. We select a default value of 3 even though it does not provide the maximum
savings. Besides, too many shortcuts may confuse users.
From Figure 6 we see that the percentage of average cost saved decreases with N. We conclude that
best results are obtained with the 2-gram model. This is somewhat surprising. As discussed in Section
3.2, N-gram model's accuracy increases with N. The explanation for Figure 6 is that as N increases,
N-grams become less applicable, i.e., fewer predictions are available for a given prefix, which results
in fewer shortcuts.
observations and discussions
The percentage of average cost saved ranges from 19.4% to 23.0% for the NASA dataset and from 9.6%
to 37.1% for the EPA dataset. The number of shortcuts recommended has the biggest impact among the
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