added more db (fast walking)

=== Stratified cross-validation ===
=== Summary ===

Correctly Classified Instances         746               94.5501 %
Incorrectly Classified Instances        43                5.4499 %
Kappa statistic                          0.8553
Mean absolute error                      0.0631
Root mean squared error                  0.2253
Relative absolute error                 16.772  %
Root relative squared error             51.9688 %
Total Number of Instances              789     

=== Detailed Accuracy By Class ===

               TP Rate   FP Rate   Precision   Recall  F-Measure   ROC
Area  Class
                 0.894     0.037      0.889     0.894     0.892
0.938    STAIRS
                 0.963     0.106      0.964     0.963     0.964
0.938    NONSTAIR
Weighted Avg.    0.946     0.089      0.946     0.946     0.946
0.938

=== Confusion Matrix ===

   a   b   <-- classified as
 177  21 |   a = STAIRS
  22 569 |   b = NONSTAIR


=== Evaluation on test set ===
=== Summary ===

Correctly Classified Instances         999               82.6987 %
Incorrectly Classified Instances       209               17.3013 %
Kappa statistic                          0.6638
Mean absolute error                      0.1769
Root mean squared error                  0.411 
Relative absolute error                 32.2302 %
Root relative squared error             68.4357 %
Total Number of Instances             1208     

=== Detailed Accuracy By Class ===

               TP Rate   FP Rate   Precision   Recall  F-Measure   ROC
Area  Class
                 0.711     0          1         0.711     0.831
0.835    STAIRS
                 1         0.289      0.699     1         0.823
0.835    NONSTAIR
Weighted Avg.    0.827     0.116      0.879     0.827     0.828
0.835

=== Confusion Matrix ===

   a   b   <-- classified as
 514 209 |   a = STAIRS
   0 485 |   b = NONSTAIR