Confusion matrix logic
$begingroup$
Can someone explain me the logic behind the confusion matrix?
- True Positive (TP): prediction is POSITIVE, actual outcome is POSITIVE, result is 'True Positive' - No questions.
- False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?
- False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?
- True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?
confusion-matrix
New contributor
$endgroup$
add a comment |
$begingroup$
Can someone explain me the logic behind the confusion matrix?
- True Positive (TP): prediction is POSITIVE, actual outcome is POSITIVE, result is 'True Positive' - No questions.
- False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?
- False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?
- True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?
confusion-matrix
New contributor
$endgroup$
$begingroup$
Stick to positive/negative for the test, and True/false for whether the test matches reality (actual outcome). Then it should be clear.
$endgroup$
– Mitch
yesterday
add a comment |
$begingroup$
Can someone explain me the logic behind the confusion matrix?
- True Positive (TP): prediction is POSITIVE, actual outcome is POSITIVE, result is 'True Positive' - No questions.
- False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?
- False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?
- True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?
confusion-matrix
New contributor
$endgroup$
Can someone explain me the logic behind the confusion matrix?
- True Positive (TP): prediction is POSITIVE, actual outcome is POSITIVE, result is 'True Positive' - No questions.
- False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?
- False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?
- True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?
confusion-matrix
confusion-matrix
New contributor
New contributor
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asked yesterday
Tauno TanilasTauno Tanilas
261
261
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$begingroup$
Stick to positive/negative for the test, and True/false for whether the test matches reality (actual outcome). Then it should be clear.
$endgroup$
– Mitch
yesterday
add a comment |
$begingroup$
Stick to positive/negative for the test, and True/false for whether the test matches reality (actual outcome). Then it should be clear.
$endgroup$
– Mitch
yesterday
$begingroup$
Stick to positive/negative for the test, and True/false for whether the test matches reality (actual outcome). Then it should be clear.
$endgroup$
– Mitch
yesterday
$begingroup$
Stick to positive/negative for the test, and True/false for whether the test matches reality (actual outcome). Then it should be clear.
$endgroup$
– Mitch
yesterday
add a comment |
4 Answers
4
active
oldest
votes
$begingroup$
A confusion matrix is a table that is often used to describe the performance of a classification model. The figure you have provided presents a binary case, but it is also used with more than 2 classes (there are just more rows/columns).
The rows refer to the actual Ground-Truth label/class of the input and the columns refer to the prediction provided by the model.
The name of the different cases are taken from the predictor's point of view.
True/False means that the prediction is the same as the ground truth and Negative/Positive refers to what was the prediction.
The 4 different cases in the confusion matrix:
True Positive (TP): The model's prediction is "Positive" and it is the same as the actual ground-truth class, which is "Positive", so this is a True Positive case.
False Negative (FN): The model's prediction is "Negative" and it is wrong because the actual ground-truth class is "Positive", so this is a False Negative case.
False Positive (FP): The model's prediction is "Positive" and it is wrong because the actual ground-truth class is "Negative", so this is a False Positive case.
True Negative (TN): The model's prediction is "Negative" and it is the same as the actual ground-truth class, which is "Negative", so this is a True Negative case.
$endgroup$
2
$begingroup$
Thanks a lot! It's all clear now :)
$endgroup$
– Tauno Tanilas
yesterday
add a comment |
$begingroup$
Please find the below:
False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?
Answer : The predictive model supposed to give the answer as 'Positive', but it predicted as 'Negative', which means Falsely predicted as Negative aka False Negative.False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?
Answer : The predictive model supposed to give the answer as 'Negative', but it predicted as 'Positive', which means Falsely predicted as Positive aka False Positive.True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?
Answer : The predicted output supposed to be Negative, and model also predicted as Negative.
For better understanding, you can run a simple binary classfication model and analyze the confusion matrix.
Thank you,
KK
$endgroup$
add a comment |
$begingroup$
Seems like you understand the meaning of the confusion matrix, nut not the logic used to name its entries!
Here are my 5 cents:
The names are all of this kind:
<True/False> <Positive/Negative>
| |
Part1 Part2
The first part explains if the prediction was right or not. If you have only True Positive and True Negative your model is perfect. If you have only False Positive and False Negative your model is really bad.
The second part explains the prediction of the model.
So:
False Negative (FN): the prediction is NEGATIVE (0) but the first part is False, this means that the prediction is wrong (should have been POSITIVE (1)).
False Positive (FP): the prediction is POSITIVE (1) but the first part is False, this means that the prediction is wrong (should have been NEGATIVE (0)).
True Negative (TN): prediction is NEGATIVE and the first part is True. The prediction is right (model predicted NEGATIVE, for NEGATIVE samples)
$endgroup$
add a comment |
$begingroup$
True means Correct, False means Incorrect.
True Positive (TP): Model predicts P, which is Correct.
False Positive (FP): Model predicts P, which is Incorrect, must have predicted N.
True Negative (TN): Model predicts N, which is Correct.
False Negative (FN): Model predicts N, which is Incorrect, must have predicted P.
$endgroup$
add a comment |
Your Answer
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
A confusion matrix is a table that is often used to describe the performance of a classification model. The figure you have provided presents a binary case, but it is also used with more than 2 classes (there are just more rows/columns).
The rows refer to the actual Ground-Truth label/class of the input and the columns refer to the prediction provided by the model.
The name of the different cases are taken from the predictor's point of view.
True/False means that the prediction is the same as the ground truth and Negative/Positive refers to what was the prediction.
The 4 different cases in the confusion matrix:
True Positive (TP): The model's prediction is "Positive" and it is the same as the actual ground-truth class, which is "Positive", so this is a True Positive case.
False Negative (FN): The model's prediction is "Negative" and it is wrong because the actual ground-truth class is "Positive", so this is a False Negative case.
False Positive (FP): The model's prediction is "Positive" and it is wrong because the actual ground-truth class is "Negative", so this is a False Positive case.
True Negative (TN): The model's prediction is "Negative" and it is the same as the actual ground-truth class, which is "Negative", so this is a True Negative case.
$endgroup$
2
$begingroup$
Thanks a lot! It's all clear now :)
$endgroup$
– Tauno Tanilas
yesterday
add a comment |
$begingroup$
A confusion matrix is a table that is often used to describe the performance of a classification model. The figure you have provided presents a binary case, but it is also used with more than 2 classes (there are just more rows/columns).
The rows refer to the actual Ground-Truth label/class of the input and the columns refer to the prediction provided by the model.
The name of the different cases are taken from the predictor's point of view.
True/False means that the prediction is the same as the ground truth and Negative/Positive refers to what was the prediction.
The 4 different cases in the confusion matrix:
True Positive (TP): The model's prediction is "Positive" and it is the same as the actual ground-truth class, which is "Positive", so this is a True Positive case.
False Negative (FN): The model's prediction is "Negative" and it is wrong because the actual ground-truth class is "Positive", so this is a False Negative case.
False Positive (FP): The model's prediction is "Positive" and it is wrong because the actual ground-truth class is "Negative", so this is a False Positive case.
True Negative (TN): The model's prediction is "Negative" and it is the same as the actual ground-truth class, which is "Negative", so this is a True Negative case.
$endgroup$
2
$begingroup$
Thanks a lot! It's all clear now :)
$endgroup$
– Tauno Tanilas
yesterday
add a comment |
$begingroup$
A confusion matrix is a table that is often used to describe the performance of a classification model. The figure you have provided presents a binary case, but it is also used with more than 2 classes (there are just more rows/columns).
The rows refer to the actual Ground-Truth label/class of the input and the columns refer to the prediction provided by the model.
The name of the different cases are taken from the predictor's point of view.
True/False means that the prediction is the same as the ground truth and Negative/Positive refers to what was the prediction.
The 4 different cases in the confusion matrix:
True Positive (TP): The model's prediction is "Positive" and it is the same as the actual ground-truth class, which is "Positive", so this is a True Positive case.
False Negative (FN): The model's prediction is "Negative" and it is wrong because the actual ground-truth class is "Positive", so this is a False Negative case.
False Positive (FP): The model's prediction is "Positive" and it is wrong because the actual ground-truth class is "Negative", so this is a False Positive case.
True Negative (TN): The model's prediction is "Negative" and it is the same as the actual ground-truth class, which is "Negative", so this is a True Negative case.
$endgroup$
A confusion matrix is a table that is often used to describe the performance of a classification model. The figure you have provided presents a binary case, but it is also used with more than 2 classes (there are just more rows/columns).
The rows refer to the actual Ground-Truth label/class of the input and the columns refer to the prediction provided by the model.
The name of the different cases are taken from the predictor's point of view.
True/False means that the prediction is the same as the ground truth and Negative/Positive refers to what was the prediction.
The 4 different cases in the confusion matrix:
True Positive (TP): The model's prediction is "Positive" and it is the same as the actual ground-truth class, which is "Positive", so this is a True Positive case.
False Negative (FN): The model's prediction is "Negative" and it is wrong because the actual ground-truth class is "Positive", so this is a False Negative case.
False Positive (FP): The model's prediction is "Positive" and it is wrong because the actual ground-truth class is "Negative", so this is a False Positive case.
True Negative (TN): The model's prediction is "Negative" and it is the same as the actual ground-truth class, which is "Negative", so this is a True Negative case.
answered yesterday
Mark.FMark.F
9991418
9991418
2
$begingroup$
Thanks a lot! It's all clear now :)
$endgroup$
– Tauno Tanilas
yesterday
add a comment |
2
$begingroup$
Thanks a lot! It's all clear now :)
$endgroup$
– Tauno Tanilas
yesterday
2
2
$begingroup$
Thanks a lot! It's all clear now :)
$endgroup$
– Tauno Tanilas
yesterday
$begingroup$
Thanks a lot! It's all clear now :)
$endgroup$
– Tauno Tanilas
yesterday
add a comment |
$begingroup$
Please find the below:
False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?
Answer : The predictive model supposed to give the answer as 'Positive', but it predicted as 'Negative', which means Falsely predicted as Negative aka False Negative.False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?
Answer : The predictive model supposed to give the answer as 'Negative', but it predicted as 'Positive', which means Falsely predicted as Positive aka False Positive.True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?
Answer : The predicted output supposed to be Negative, and model also predicted as Negative.
For better understanding, you can run a simple binary classfication model and analyze the confusion matrix.
Thank you,
KK
$endgroup$
add a comment |
$begingroup$
Please find the below:
False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?
Answer : The predictive model supposed to give the answer as 'Positive', but it predicted as 'Negative', which means Falsely predicted as Negative aka False Negative.False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?
Answer : The predictive model supposed to give the answer as 'Negative', but it predicted as 'Positive', which means Falsely predicted as Positive aka False Positive.True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?
Answer : The predicted output supposed to be Negative, and model also predicted as Negative.
For better understanding, you can run a simple binary classfication model and analyze the confusion matrix.
Thank you,
KK
$endgroup$
add a comment |
$begingroup$
Please find the below:
False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?
Answer : The predictive model supposed to give the answer as 'Positive', but it predicted as 'Negative', which means Falsely predicted as Negative aka False Negative.False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?
Answer : The predictive model supposed to give the answer as 'Negative', but it predicted as 'Positive', which means Falsely predicted as Positive aka False Positive.True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?
Answer : The predicted output supposed to be Negative, and model also predicted as Negative.
For better understanding, you can run a simple binary classfication model and analyze the confusion matrix.
Thank you,
KK
$endgroup$
Please find the below:
False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?
Answer : The predictive model supposed to give the answer as 'Positive', but it predicted as 'Negative', which means Falsely predicted as Negative aka False Negative.False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?
Answer : The predictive model supposed to give the answer as 'Negative', but it predicted as 'Positive', which means Falsely predicted as Positive aka False Positive.True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?
Answer : The predicted output supposed to be Negative, and model also predicted as Negative.
For better understanding, you can run a simple binary classfication model and analyze the confusion matrix.
Thank you,
KK
answered yesterday
KK2491KK2491
343219
343219
add a comment |
add a comment |
$begingroup$
Seems like you understand the meaning of the confusion matrix, nut not the logic used to name its entries!
Here are my 5 cents:
The names are all of this kind:
<True/False> <Positive/Negative>
| |
Part1 Part2
The first part explains if the prediction was right or not. If you have only True Positive and True Negative your model is perfect. If you have only False Positive and False Negative your model is really bad.
The second part explains the prediction of the model.
So:
False Negative (FN): the prediction is NEGATIVE (0) but the first part is False, this means that the prediction is wrong (should have been POSITIVE (1)).
False Positive (FP): the prediction is POSITIVE (1) but the first part is False, this means that the prediction is wrong (should have been NEGATIVE (0)).
True Negative (TN): prediction is NEGATIVE and the first part is True. The prediction is right (model predicted NEGATIVE, for NEGATIVE samples)
$endgroup$
add a comment |
$begingroup$
Seems like you understand the meaning of the confusion matrix, nut not the logic used to name its entries!
Here are my 5 cents:
The names are all of this kind:
<True/False> <Positive/Negative>
| |
Part1 Part2
The first part explains if the prediction was right or not. If you have only True Positive and True Negative your model is perfect. If you have only False Positive and False Negative your model is really bad.
The second part explains the prediction of the model.
So:
False Negative (FN): the prediction is NEGATIVE (0) but the first part is False, this means that the prediction is wrong (should have been POSITIVE (1)).
False Positive (FP): the prediction is POSITIVE (1) but the first part is False, this means that the prediction is wrong (should have been NEGATIVE (0)).
True Negative (TN): prediction is NEGATIVE and the first part is True. The prediction is right (model predicted NEGATIVE, for NEGATIVE samples)
$endgroup$
add a comment |
$begingroup$
Seems like you understand the meaning of the confusion matrix, nut not the logic used to name its entries!
Here are my 5 cents:
The names are all of this kind:
<True/False> <Positive/Negative>
| |
Part1 Part2
The first part explains if the prediction was right or not. If you have only True Positive and True Negative your model is perfect. If you have only False Positive and False Negative your model is really bad.
The second part explains the prediction of the model.
So:
False Negative (FN): the prediction is NEGATIVE (0) but the first part is False, this means that the prediction is wrong (should have been POSITIVE (1)).
False Positive (FP): the prediction is POSITIVE (1) but the first part is False, this means that the prediction is wrong (should have been NEGATIVE (0)).
True Negative (TN): prediction is NEGATIVE and the first part is True. The prediction is right (model predicted NEGATIVE, for NEGATIVE samples)
$endgroup$
Seems like you understand the meaning of the confusion matrix, nut not the logic used to name its entries!
Here are my 5 cents:
The names are all of this kind:
<True/False> <Positive/Negative>
| |
Part1 Part2
The first part explains if the prediction was right or not. If you have only True Positive and True Negative your model is perfect. If you have only False Positive and False Negative your model is really bad.
The second part explains the prediction of the model.
So:
False Negative (FN): the prediction is NEGATIVE (0) but the first part is False, this means that the prediction is wrong (should have been POSITIVE (1)).
False Positive (FP): the prediction is POSITIVE (1) but the first part is False, this means that the prediction is wrong (should have been NEGATIVE (0)).
True Negative (TN): prediction is NEGATIVE and the first part is True. The prediction is right (model predicted NEGATIVE, for NEGATIVE samples)
answered yesterday
Francesco PegoraroFrancesco Pegoraro
56717
56717
add a comment |
add a comment |
$begingroup$
True means Correct, False means Incorrect.
True Positive (TP): Model predicts P, which is Correct.
False Positive (FP): Model predicts P, which is Incorrect, must have predicted N.
True Negative (TN): Model predicts N, which is Correct.
False Negative (FN): Model predicts N, which is Incorrect, must have predicted P.
$endgroup$
add a comment |
$begingroup$
True means Correct, False means Incorrect.
True Positive (TP): Model predicts P, which is Correct.
False Positive (FP): Model predicts P, which is Incorrect, must have predicted N.
True Negative (TN): Model predicts N, which is Correct.
False Negative (FN): Model predicts N, which is Incorrect, must have predicted P.
$endgroup$
add a comment |
$begingroup$
True means Correct, False means Incorrect.
True Positive (TP): Model predicts P, which is Correct.
False Positive (FP): Model predicts P, which is Incorrect, must have predicted N.
True Negative (TN): Model predicts N, which is Correct.
False Negative (FN): Model predicts N, which is Incorrect, must have predicted P.
$endgroup$
True means Correct, False means Incorrect.
True Positive (TP): Model predicts P, which is Correct.
False Positive (FP): Model predicts P, which is Incorrect, must have predicted N.
True Negative (TN): Model predicts N, which is Correct.
False Negative (FN): Model predicts N, which is Incorrect, must have predicted P.
answered yesterday
EsmailianEsmailian
1,686114
1,686114
add a comment |
add a comment |
Tauno Tanilas is a new contributor. Be nice, and check out our Code of Conduct.
Tauno Tanilas is a new contributor. Be nice, and check out our Code of Conduct.
Tauno Tanilas is a new contributor. Be nice, and check out our Code of Conduct.
Tauno Tanilas is a new contributor. Be nice, and check out our Code of Conduct.
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$begingroup$
Stick to positive/negative for the test, and True/false for whether the test matches reality (actual outcome). Then it should be clear.
$endgroup$
– Mitch
yesterday