# Fw: [SIGMETRICS] Towards a new crown indicator: an empirical analysis

Loet Leydesdorff loet at LEYDESDORFF.NET
Fri Apr 16 20:32:36 EDT 2010

```Thank you so much for the clarification. Best, Loet

On Fri, Apr 16, 2010 at 6:54 PM, T. van Raan <vanraan at xs4all.nl> wrote:
> Adminstrative info for SIGMETRICS (for example unsubscribe):
> http://web.utk.edu/~gwhitney/sigmetrics.html
>
> Dear Colleagues,
>
> To remove any misunderstanding concerning the point raised by Loet (see
> below), the following short comment. In Eq. 1 of our paper the elements (i)
> in the summation in the numerator obviously concern the same elements as in
> the denomitator, by definition. The elements are the publications of any
> kind of entity (e.g., group, institute, university, country). In the
> numerator the number of citations received by each of the elements i are
> totalled, and in the nominator we have the sum of the expected values of the
> same elements i. So both summations concern exactly the same set, and thus
> the total size of the summation is the same for the denominator and the
> nominator, which is n.
>
> Best regards,
> Ton van Raan
>
>
> ----- Original Message ----- From: "Loet Leydesdorff" <loet at LEYDESDORFF.NET>
> To: <SIGMETRICS at LISTSERV.UTK.EDU>
> Sent: Friday, April 16, 2010 12:39 PM
> Subject: Re: [SIGMETRICS] Towards a new crown indicator: an empirical
> analysis
>
>
>> Adminstrative info for SIGMETRICS (for example unsubscribe):
>> http://web.utk.edu/~gwhitney/sigmetrics.html
>>
>> Dear Ton,
>>
>> I read the paper with interest.
>>
>> It seems to me that the value of n in the numerator and denominator of
>> Equation 1 are different, aren't they? Would it then not be better to
>> use different symbols, (fore example, m and n)?
>>
>> Perhaps, I misunderstand. In that case, please, clarify.
>>
>> Best wishes,
>>
>> Loet
>>
>>
>> On Wed, Apr 14, 2010 at 2:29 PM, Anthony F.J. van Raan
>> <vanraan at xs4all.nl> wrote:
>>>
>>> Adminstrative info for SIGMETRICS (for example unsubscribe):
>>> http://web.utk.edu/~gwhitney/sigmetrics.html
>>>
>>> Dear Colleagues, we have the following contribution to the discussion on
>>> new bibliometric performance indicators: http://arxiv.org/abs/1004.1632v1
>>> .
>>>
>>> Best wishes,
>>> Ton van Raan
>>>
>>
>>
>>
>> --
>> Loet Leydesdorff
>> Amsterdam School of Communications Research (ASCoR)
>> Kloveniersburgwal 48, 1012 CX Amsterdam
>> Tel.: +31-20- 525 6598; fax: +31-20- 525 3681
>> loet at leydesdorff.net ; http://www.leydesdorff.net/
>> ---------------------------------------
>> Now available: The Knowledge-Based Economy: Modeled, Measured,
>> Simulated, 385 pp.; US\$ 18.95;
>

--
Loet Leydesdorff
Amsterdam School of Communications Research (ASCoR)
Kloveniersburgwal 48, 1012 CX Amsterdam
Tel.: +31-20- 525 6598; fax: +31-20- 525 3681
loet at leydesdorff.net ; http://www.leydesdorff.net/
---------------------------------------
Now available: The Knowledge-Based Economy: Modeled, Measured,
Simulated, 385 pp.; US\$ 18.95;

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