Exhibit 9-1. The confusion matrix for a classification method with Class 1 and C

Question

Exhibit 9-1. The confusion matrix for a classification method with Class 1 and Class 0 is given below

Confusion Matrix

Predicted Class

Actual Class

   1

0

        1

120

10

        0

100

70

Refer to Exhibit 9-1. What is the percent overall error rate?

36.67%

43.25%

58.82%

7.69%

Refer to Exhibit 9-1. What are the percent error rates for Class 1 and Class 0 ?

7.69% and 58.82%, respectively

36.67% and 43.25%, respectively

7.69% and 36.67% , respectively

43.25% and 7.69%, respectively

Refer to Exhibit 9-1. What is the sensitivity rate?

56.37%

42.18%

7.69%

92.31%

Refer to Exhibit 9-1. What is the precision percentage?

92.3%

73.33%

58.82%

54.55%

Confusion Matrix

Predicted Class

Actual Class

   1

0

        1

120

10

        0

100

70

Explanation / Answer

Error rate(overall) = ((10+100) / (120+10+100+70))*100%

= 36.67%.

Hence, Option (A) is the correct choice. (Ans).

Percent error rate of class 1 = ((10/(10+120))*100% = 7.69%

Percent error rate of class 0 = ((100/(100+70))*100% =58.82%

Hence Option (A) is the correct choice. (Ans).

Sensitivity rate = TP / (TP + FN) = (120 /(120 + 10))*100% = 92.31%. Hence, Option (D) is the correct choice. (Ans).

Precision percentage = TP / (TP + FP) = 120/(120+100))*100% = 54.55%. Hence, Option (D) is the correct choice. (Ans).

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