what is accuracy measure in weka explorer?

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what is accuracy measure in weka explorer?

SeyyedMahdiHP
This post was updated on .
hello all
can anyone tell me what is the accuracy meausere in weka explorer output?:
is it F-measure or correctly classified?and which is  more important than the other?

Correctly Classified Instances          15               55.5556 %
Incorrectly Classified Instances        12               44.4444 %
Kappa statistic                          0    
Mean absolute error                      0.4986
Root mean squared error                  0.5014
Relative absolute error                100      %
Root relative squared error            100      %
Total Number of Instances               27    

=== Detailed Accuracy By Class ===

                 TP Rate  FP Rate  Precision  Recall   F-Measure  MCC      ROC Area  PRC Area  Class
                 1.000    1.000    0.556      1.000    0.714      0.000    0.358     0.498     n
                 0.000    0.000    0.000      0.000    0.000      0.000    0.358     0.382     v
Weighted Avg.    0.556    0.556    0.309      0.556    0.397      0.000    0.358     0.447    

=== Confusion Matrix ===

  a  b   <-- classified as
 15  0 |  a = n
 12  0 |  b = v
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Re: what is accuracy measure in weka explorer?

johnnyF7
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The overall classification accuracy measure is given by the percentage of correctly classified instances. F-measure is a different type of accuracy measure that takes into account class imbalances, precision and recall.  
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Re: what is accuracy measure in weka explorer?

SeyyedMahdiHP
thank you sir
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