Questions tagged [true-positive-rate]

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ROC curve and thresholds: why does it never have the ideal point at the top left for observations close to certainty?

I am using ROC curves for multi-label classification. I have a classifier that produces a score for each label, say a Logistic Regression that produces a probability. I understand that an ROC curve is ...
• 135
21 views

What does positive likelihood ratio mean outside of medicine?

I am a meteorologist and I regularly hear of POD (we call it probability of detection) $POD = \frac{TP}{TP+FN}$ as well as FAR (False Alarm Rate) $FAR = \frac{FP}{FP+TN}$. But I recently had a ...
• 123
1 vote
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Best way to sum up and visualize the relation between results of 2 tests measuring the same outcome with 3 results

I have a dataset of different individuals who underwent 2 test that measure the same outcome with 3 possible results not reduced mildly reduced highly reduced I know that the distribution of the ...
• 11
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Calculate probability of alarm and the posterior probability of this alarm being false over different frequencies of output

I have the following information for an automatic detection system that output a warning when a signal is detected: Specificity: .99 (i.e. a false positive rate $FP = .01$) Sensitivity: .9 (i.e. a ...
226 views

How to interpret ROC curve if my FPR (X-axis) values ranges from 0 to 0.02?

I am plotting the ROC curve for my classification problem. The results I am getting for the problem are TPR ranges from 0 to 1, but the FPR ranges from 0 to 0.02. I have plotted the ROC curve by ...
1 vote
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Can a low rate of true positives minimise false negatives?

I am analysing thousands of scientific pictures which all show a similar light pattern, trying to identify local anomalies on the pictures. As it is nearly impossible to inspect each single image due ...
• 11
1 vote
859 views

Logistic Regression: What is the value for precision when recall (true positive rate) is 0?

A quick overview of definitions before I get into the question: True Positive (TP): An actual positive that the model classified as positive False Positive (FP): An actual negative that the model ...
• 699
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why I am getting TP and FP in confusion matrix is 0, how to get it right?

why I am getting TP and FP in confusion matrix is 0, how to get it right? tp = 0,fp = 0,tn = 9847,fn = 18