What is the difference between nDCG and rank correlation methods?
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When do we use one or the other?
My use case:
I want to evaluate a linear space to see how good retrieval results are. I have a set of data X (m x n) and some weights W (m x 1). I want to measure the nearest neighbour retrieval performance on W'X with a ground truth value Y. This is a continuous value, so I can't use simple precision/recall.
If I use rank correlation, I will find the correlation between retrieved Ys and retrieval rank. If I use nDCG, I will use sorted Y to compute IDCG.
I would like to compare this to the correlation value I get when I change Y also. (For example, Y could be head pose angle in one case and age in another)
ranking learning-to-rank ndcg
asked 3 mins ago
TyanTowersTyanTowers
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add a comment |
$begingroup$
When do we use one or the other?
My use case:
I want to evaluate a linear space to see how good retrieval results are. I have a set of data X (m x n) and some weights W (m x 1). I want to measure the nearest neighbour retrieval performance on W'X with a ground truth value Y. This is a continuous value, so I can't use simple precision/recall.
If I use rank correlation, I will find the correlation between retrieved Ys and retrieval rank. If I use nDCG, I will use sorted Y to compute IDCG.
I would like to compare this to the correlation value I get when I change Y also. (For example, Y could be head pose angle in one case and age in another)
ranking learning-to-rank ndcg
asked 3 mins ago
TyanTowersTyanTowers
1
New contributor
TyanTowers is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
When do we use one or the other?
My use case:
I want to evaluate a linear space to see how good retrieval results are. I have a set of data X (m x n) and some weights W (m x 1). I want to measure the nearest neighbour retrieval performance on W'X with a ground truth value Y. This is a continuous value, so I can't use simple precision/recall.
If I use rank correlation, I will find the correlation between retrieved Ys and retrieval rank. If I use nDCG, I will use sorted Y to compute IDCG.
I would like to compare this to the correlation value I get when I change Y also. (For example, Y could be head pose angle in one case and age in another)
ranking learning-to-rank ndcg
asked 3 mins ago
TyanTowersTyanTowers
1
New contributor
TyanTowers is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
When do we use one or the other?
My use case:
I want to evaluate a linear space to see how good retrieval results are. I have a set of data X (m x n) and some weights W (m x 1). I want to measure the nearest neighbour retrieval performance on W'X with a ground truth value Y. This is a continuous value, so I can't use simple precision/recall.
If I use rank correlation, I will find the correlation between retrieved Ys and retrieval rank. If I use nDCG, I will use sorted Y to compute IDCG.
I would like to compare this to the correlation value I get when I change Y also. (For example, Y could be head pose angle in one case and age in another)
ranking learning-to-rank ndcg
ranking learning-to-rank ndcg
asked 3 mins ago
TyanTowersTyanTowers
1
New contributor
TyanTowers is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
TyanTowersTyanTowers
1
New contributor
TyanTowers is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
TyanTowersTyanTowers
1
New contributor
TyanTowers is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
TyanTowersTyanTowers
1
asked 3 mins ago
TyanTowersTyanTowers
1
1
New contributor
TyanTowers is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
TyanTowers is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
TyanTowers is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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