Three sets of results were obtained and are presented in subsections
6.5.1, 6.5.2, and 6.5.3, respectively. Each set contains the precision
accuracy and recall accuracy for the five classification schemes.
For each set, we used 10-fold cross validation. In 10-fold cross
validation, the original sample was randomly divided
into 10 subsamples. Of the 10 subsamples, a single subsample was
retained as the validation data for testing the classification model,
the remaining 9 subsamples were used for training data. The crossvalidation process was then repeated 10 times, with each of
the 10 subsamples used exactly once as the validation data.
The 10 results were then averaged to produce a single estimation.