Quick Question
This question asks about the following two confusion matrices:
Confusion Matrix #1:
| Predicted = 0 | Predicted = 1 | |
|---|---|---|
| Actual = 0 | 15 | 10 |
| Actual = 1 | 5 | 20 |
Confusion Matrix #2:
| Predicted = 0 | Predicted = 1 | |
|---|---|---|
| Actual = 0 | 20 | 5 |
| Actual = 1 | 10 | 15 |
What is the sensitivity of Confusion Matrix #1?
Exercise 1
Numerical Response
Explanation
The sensitivity of a confusion matrix is the true positives, divided by the true positives plus the false negatives. In this case, it is 20/(20+5) = 0.8
What is the specificity of Confusion Matrix #1?
Exercise 2
Numerical Response
Explanation
The specificity of a confusion matrix is the true negatives, divided by the true negatives plus the false positives. In this case, it is 15/(15+10) = 0.6
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Quick Question
To go from Confusion Matrix #1 to Confusion Matrix #2, did we increase or decrease the threshold value?
Exercise 3
We increased the threshold value.
We decreased the threshold value.
Explanation
We predict the outcome 1 less often in Confusion Matrix #2. This means we must have increased the threshold.
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