BIBA - K Nearest neighbours - Quizzes
6 important questions on BIBA - K Nearest neighbours - Quizzes
Quiz P.2
- The prediction in the figure is a:
- 1. True Positive
- 2. False Positive
- 3. False Negative
- 4. True Negative
![]()
- 1. True Positive
- 2. False Positive
- 3. False Negative
- 4. True Negative
Quiz P.3
- The table shows the numbers of results given the actual and predicted class for technique X. What is the accuracy of the technique?
What can be said about the area below the diagonal line and the graphs?![]()
- Area below diagonal line is prediction is opposite of the true class
- Best model is closest to TP rate axis (blue)
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Which model is better and what is the most ideal area of ROC?![]()
- No model consistently outperform the other
- M1 is better for small False Positive Ratios
- M2 is better for large FPR
- Area Under the ROC curve
- Ideal:
- Area = 1
- Random guess:
- Area = 0.5
What are the total costs and accuracy of the models?![]()
Cost = 3910
M2: acc= 90%
Cost = 4255
Calculate the kappa statistic of the table
- Example:
- Success rate of actual predictor = (88+40+12)/200 = 140/200 = 0.7
- Success rate of random predictor = (60+18+4)/200 = 82/200 = 0.41
- Kappa statistics = (0.7–0.41)/(1–0.41) = 0.492
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