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what could this mean if your “elbow curve” looks like this?
2019 Community Moderator ElectionWhat does 'contextual' mean in 'contextual bandits'?What does “zero-meaned vector” meanWhat did Geoffrey Hinton mean when he said this?What do mean and variance mean for high dimensional data?Is removing poorly predicted data points a valid approach?What does Logits in machine learning mean?What approach other than Tf-Idf could I use for text-clustering using K-Means?What algorithm could be used to fuzzy merge multiple datasets?What is wrong with my Precision-Recall curve?What should the neural network output look like for this implementation?
$begingroup$
This is from running kmeans clustering with k on the x-axis (ranging from 2 to 10) and the silhouette distance on the y-axis.
Clearly there's peaks at k=3, k=4 and it seems to decline from there. It doesn't resemble an elbow and thought it should rise as k gets larger (due to over fitting on he training set). Do I just lack data?
I'm computing the silhouette distance using a 80-20 train test split.
machine-learning k-means
asked 14 hours ago
MrLMrL
62
New contributor
MrL 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 |
$begingroup$
This is from running kmeans clustering with k on the x-axis (ranging from 2 to 10) and the silhouette distance on the y-axis.
Clearly there's peaks at k=3, k=4 and it seems to decline from there. It doesn't resemble an elbow and thought it should rise as k gets larger (due to over fitting on he training set). Do I just lack data?
I'm computing the silhouette distance using a 80-20 train test split.
machine-learning k-means
asked 14 hours ago
MrLMrL
62
New contributor
MrL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
$begingroup$
So, what’s the size of your data?
$endgroup$
– pythinker
8 hours ago
$begingroup$
few thousand rows , TFIDF based clustering ~ 50 000 features
$endgroup$
– MrL
7 hours ago
add a comment |
$begingroup$
This is from running kmeans clustering with k on the x-axis (ranging from 2 to 10) and the silhouette distance on the y-axis.
Clearly there's peaks at k=3, k=4 and it seems to decline from there. It doesn't resemble an elbow and thought it should rise as k gets larger (due to over fitting on he training set). Do I just lack data?
I'm computing the silhouette distance using a 80-20 train test split.
machine-learning k-means
asked 14 hours ago
MrLMrL
62
New contributor
MrL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
This is from running kmeans clustering with k on the x-axis (ranging from 2 to 10) and the silhouette distance on the y-axis.
Clearly there's peaks at k=3, k=4 and it seems to decline from there. It doesn't resemble an elbow and thought it should rise as k gets larger (due to over fitting on he training set). Do I just lack data?
I'm computing the silhouette distance using a 80-20 train test split.
machine-learning k-means
machine-learning k-means
asked 14 hours ago
MrLMrL
62
New contributor
MrL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 14 hours ago
MrLMrL
62
New contributor
MrL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 14 hours ago
MrLMrL
62
New contributor
MrL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 14 hours ago
MrLMrL
62
asked 14 hours ago
MrLMrL
62
62
New contributor
MrL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
MrL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
MrL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$begingroup$
So, what’s the size of your data?
$endgroup$
– pythinker
8 hours ago
$begingroup$
few thousand rows , TFIDF based clustering ~ 50 000 features
$endgroup$
– MrL
7 hours ago
add a comment |
$begingroup$
So, what’s the size of your data?
$endgroup$
– pythinker
8 hours ago
$begingroup$
few thousand rows , TFIDF based clustering ~ 50 000 features
$endgroup$
– MrL
7 hours ago
$begingroup$
So, what’s the size of your data?
$endgroup$
– pythinker
8 hours ago
$begingroup$
So, what’s the size of your data?
$endgroup$
– pythinker
8 hours ago
$begingroup$
few thousand rows , TFIDF based clustering ~ 50 000 features
$endgroup$
– MrL
7 hours ago
$begingroup$
few thousand rows , TFIDF based clustering ~ 50 000 features
$endgroup$
– MrL
7 hours ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
First of all, you do have two elbows: one at $k=4$ and a large one at $k=8$. The second isn't very apparent because you haven't drawn out the plot for larger values of $k$. If you do you might get a figure like this:
Secondly, you aren't meant to look for an elbow when computing the silhouette score! The silhouette score accounts for both inter- and intra-cluster distance, as such it can be used for selecting $k$ on its own (i.e. select the $k$ that produces the best silhouette score).
Note: I'm not familiar with the "silhouette distance", I assume it is somewhat related to the silhouette score (maybe its inverse).
The "elbow" criterion should be used when dealing with metrics that tend to improve as $k$ increases (e.g. inertia).
answered 7 hours ago
Djib2011Djib2011
2,61231125
$endgroup$
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
First of all, you do have two elbows: one at $k=4$ and a large one at $k=8$. The second isn't very apparent because you haven't drawn out the plot for larger values of $k$. If you do you might get a figure like this:
Secondly, you aren't meant to look for an elbow when computing the silhouette score! The silhouette score accounts for both inter- and intra-cluster distance, as such it can be used for selecting $k$ on its own (i.e. select the $k$ that produces the best silhouette score).
Note: I'm not familiar with the "silhouette distance", I assume it is somewhat related to the silhouette score (maybe its inverse).
The "elbow" criterion should be used when dealing with metrics that tend to improve as $k$ increases (e.g. inertia).
answered 7 hours ago
Djib2011Djib2011
2,61231125
$endgroup$
add a comment |
$begingroup$
First of all, you do have two elbows: one at $k=4$ and a large one at $k=8$. The second isn't very apparent because you haven't drawn out the plot for larger values of $k$. If you do you might get a figure like this:
Secondly, you aren't meant to look for an elbow when computing the silhouette score! The silhouette score accounts for both inter- and intra-cluster distance, as such it can be used for selecting $k$ on its own (i.e. select the $k$ that produces the best silhouette score).
Note: I'm not familiar with the "silhouette distance", I assume it is somewhat related to the silhouette score (maybe its inverse).
The "elbow" criterion should be used when dealing with metrics that tend to improve as $k$ increases (e.g. inertia).
answered 7 hours ago
Djib2011Djib2011
2,61231125
$endgroup$
add a comment |
$begingroup$
First of all, you do have two elbows: one at $k=4$ and a large one at $k=8$. The second isn't very apparent because you haven't drawn out the plot for larger values of $k$. If you do you might get a figure like this:
Secondly, you aren't meant to look for an elbow when computing the silhouette score! The silhouette score accounts for both inter- and intra-cluster distance, as such it can be used for selecting $k$ on its own (i.e. select the $k$ that produces the best silhouette score).
Note: I'm not familiar with the "silhouette distance", I assume it is somewhat related to the silhouette score (maybe its inverse).
The "elbow" criterion should be used when dealing with metrics that tend to improve as $k$ increases (e.g. inertia).
answered 7 hours ago
Djib2011Djib2011
2,61231125
$endgroup$
First of all, you do have two elbows: one at $k=4$ and a large one at $k=8$. The second isn't very apparent because you haven't drawn out the plot for larger values of $k$. If you do you might get a figure like this:
Secondly, you aren't meant to look for an elbow when computing the silhouette score! The silhouette score accounts for both inter- and intra-cluster distance, as such it can be used for selecting $k$ on its own (i.e. select the $k$ that produces the best silhouette score).
Note: I'm not familiar with the "silhouette distance", I assume it is somewhat related to the silhouette score (maybe its inverse).
The "elbow" criterion should be used when dealing with metrics that tend to improve as $k$ increases (e.g. inertia).
answered 7 hours ago
Djib2011Djib2011
2,61231125
answered 7 hours ago
Djib2011Djib2011
2,61231125
answered 7 hours ago
Djib2011Djib2011
2,61231125
answered 7 hours ago
Djib2011Djib2011
2,61231125
2,61231125
add a comment |
add a comment |
MrL is a new contributor. Be nice, and check out our Code of Conduct.
MrL is a new contributor. Be nice, and check out our Code of Conduct.
MrL is a new contributor. Be nice, and check out our Code of Conduct.
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$begingroup$
So, what’s the size of your data?
$endgroup$
– pythinker
8 hours ago
$begingroup$
few thousand rows , TFIDF based clustering ~ 50 000 features
$endgroup$
– MrL
7 hours ago