Hi,

I am currently using STATA in my analysis.  STATA has a cluster option but
does not have any tests for whether cluster analysis is necessary or not for
a dataset.  So I am trying to figure out whether R could be used to test
whether I need to be doing cluster analysis or not.  If R does tests to
determine whether cluster analysis is valid for my data, I will learn R and
use it on my data.

My data are panel data consisting of 49 states and 25 years.  Currently, I
am estimating models with fixed state and time effects.

Thanks for any help you can give me.

Cheers,

Mary



On Mon, May 2, 2011 at 1:02 PM, Tal Galili <tal.galili@gmail.com> wrote:

> Hi Mary,
> Are you using R for your other analysis?
> If so, What commands are you using for your analysis?
>
> p.s: please keep the rest of the R-help mailing list in the loop.
>
> Cheers,
> Tal
>
>
>
>
> ----------------Contact
> Details:-------------------------------------------------------
> Contact me: Tal.Galili@gmail.com |  972-52-7275845
> Read me: www.talgalili.com (Hebrew) | www.biostatistics.co.il (Hebrew) |
> www.r-statistics.com (English)
>
> ----------------------------------------------------------------------------------------------
>
>
>
>
>   On Mon, May 2, 2011 at 4:24 PM, MARY A. WEISS <mweiss@temple.edu> wrote:
>
>> Hi Tal,
>>
>> Thanks for your answer.  I am running models with two-way fixed effects
>> and two-way fixed effects with a cluster option.  The results are very
>> different.  I wanted to know if it is appropriate to cluster my data or
>> not.  In looking through the R manual, I thought that prabclus might help me
>> answer the question.  Does prabclus include any tests that will tell me if
>> cluster analysis is appropriate to use with my data?  That is, is cluster
>> analysis valid for my data?
>>
>> Thanks in advance for any help you can give me.  I really appreciate it.
>>
>> Mary
>>
>>   On Mon, May 2, 2011 at 7:20 AM, Tal Galili <tal.galili@gmail.com>wrote:
>>
>>> Hi Mary,
>>> I'm not sure I understood your question.
>>>
>>> Are you using this package:
>>> http://cran.r-project.org/web/packages/prabclus/index.html
>>>  <http://cran.r-project.org/web/packages/prabclus/index.html>And asking
>>> how to decide if to use it or not?
>>>
>>> ----------------Contact
>>> Details:-------------------------------------------------------
>>> Contact me: Tal.Galili@gmail.com |  972-52-7275845
>>> Read me: www.talgalili.com (Hebrew) | www.biostatistics.co.il (Hebrew) |
>>> www.r-statistics.com (English)
>>> ----------------------------------------------------------------------------------------------
>>>
>>>
>>>
>>>
>>>
>>>
>>> On Sun, May 1, 2011 at 7:54 PM, mary weiss <mweiss@temple.edu> wrote:
>>>
>>>> Does R have the capability to perform tests for the need of clustering
>>>> analysis (e.g., in prabclus)?  I am using panel data with two-way fixed
>>>> effects but am unsure about whether I should be using a cluster option
>>>> as
>>>> well to estimate my model.--
>>>> View this message in context:
>>>> http://r.789695.n4.nabble.com/Tests-for-the-need-of-cluster-analysis-tp3488097p3488097.html
>>>> Sent from the R help mailing list archive at Nabble.com.
>>>>
>>>> ______________________________________________
>>>> R-help@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<http://www.r-project.org/posting-guide.html>
>>>> and provide commented, minimal, self-contained, reproducible code.
>>>>
>>>
>>>
>>
>>
>> --
>> Mary A. Weiss, Ph. D.
>> Deaver Prof. of Risk, Insurance & Healthcare Mgmt
>> Editor, Risk Management and Insurance Review
>> Risk, Ins. & Healthcare Mgmt Dept.
>> Fox School of Business
>> 1801 Liacouras Walk 6th Fl (006-07)
>> Temple University
>> Philadelphia, PA 19122
>> 215-204-1916
>>
>
>


-- 
Mary A. Weiss, Ph. D.
Deaver Prof. of Risk, Insurance & Healthcare Mgmt
Editor, Risk Management and Insurance Review
Risk, Ins. & Healthcare Mgmt Dept.
Fox School of Business
1801 Liacouras Walk 6th Fl (006-07)
Temple University
Philadelphia, PA 19122
215-204-1916

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