R help - Apr 2010 - DICE Coefficient of similarity measure

Hi,

 

I wanted the DICE coefficient (similarity measure for binary variables)
to be calculated in R and found that the "igraph" package has the
option
of "similarity.dice" to do this. But, for this command, the input
object
should be an igraph object. But, I have a dataframe of columns
containing 1's and 0's. Can I convert this dataframe into an igraph
object, so that the DICE coefficient can be reproduced? Or does any
other packages gives the DICE coefficient?

 

Thanks,

Shubha

 

This e-mail may contain confidential and/or privileged i...{{dropped:13}}

Just wrote a small piece of code to do so. Thanks.


-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Shubha Vishwanath Karanth
Sent: Saturday, April 24, 2010 6:28 PM
To: r-help at r-project.org; r-help at stat.math.ethz.ch
Cc: Gabor.Csardi at unil.ch
Subject: [R] DICE Coefficient of similarity measure

Hi,

 

I wanted the DICE coefficient (similarity measure for binary variables)
to be calculated in R and found that the "igraph" package has the
option
of "similarity.dice" to do this. But, for this command, the input
object
should be an igraph object. But, I have a dataframe of columns
containing 1's and 0's. Can I convert this dataframe into an igraph
object, so that the DICE coefficient can be reproduced? Or does any
other packages gives the DICE coefficient?

 

Thanks,

Shubha

 

This e-mail may contain confidential and/or privileged
i...{{dropped:13}}

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
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Hi R,

Is there a package in R to perform KMedian clustering? 

Thanks.
Shubha
This e-mail may contain confidential and/or privileged i...{{dropped:10}}

pam/clara in package cluster are probably as close to it as you can be.

There is no unique definition of a multivariate median and therefore there 
is no unique definition of "k-medians", but pam/clara is one possible 
version of it. (Of course if you think of k-medians as defined in a 
specific paper, it may still be something slightly different.)

Christian

On Thu, 16 Sep 2010, Shubha Vishwanath Karanth wrote:
> Hi R,
>
> Is there a package in R to perform KMedian clustering?
>
> Thanks.
> Shubha
> This e-mail may contain confidential and/or privileged i...{{dropped:10}}
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
*** --- ***
Christian Hennig
University College London, Department of Statistical Science
Gower St., London WC1E 6BT, phone +44 207 679 1698
chrish at stats.ucl.ac.uk, www.homepages.ucl.ac.uk/~ucakche

Thanks all. But I was looking for "KMedian" algorithm and not the
"KMedoids" algorithm. The wiki says, " Note that this algorithm
is often confused with k-medoids, which finds the optimal medoid, not median,
for each cluster. (A medoid is an actual point from the dataset; a median is the
mathematical median calculated separately for each dimension.)"

Any package which does KMedian clustering algorthm? Many Thanks.
?
Regards,
Shubha.

-----Original Message-----
From: Christian Hennig [mailto:chrish at stats.ucl.ac.uk] 
Sent: Thursday, September 16, 2010 9:32 PM
To: Shubha Vishwanath Karanth
Cc: r-help at r-project.org; r-help at stat.math.ethz.ch
Subject: Re: [R] KMedians clustering in R

pam/clara in package cluster are probably as close to it as you can be.

There is no unique definition of a multivariate median and therefore there 
is no unique definition of "k-medians", but pam/clara is one possible 
version of it. (Of course if you think of k-medians as defined in a 
specific paper, it may still be something slightly different.)

Christian

On Thu, 16 Sep 2010, Shubha Vishwanath Karanth wrote:
> Hi R,
>
> Is there a package in R to perform KMedian clustering?
>
> Thanks.
> Shubha
> This e-mail may contain confidential and/or privileged i...{{dropped:10}}
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
*** --- ***
Christian Hennig
University College London, Department of Statistical Science
Gower St., London WC1E 6BT, phone +44 207 679 1698
chrish at stats.ucl.ac.uk, www.homepages.ucl.ac.uk/~ucakche
This e-mail may contain confidential and/or privileged i...{{dropped:10}}