More missing citations?

[Tim Brody]

Hmmm (http://en.wikipedia.org/wiki/Impact_Factor),

     A = the number of times articles published in 2001-2 were cited in
tracked journals during 2003
     B = the number of articles published in 2001-2

     2003 impact factor = A/B

"ISI excludes certain article types (such as news items, correspondence,
and errata) from the *denominator*" (my emphasis)

Without trawling for an 'official' ISI definition that is what I
understood the IF to be. One of the oft-cited criticisms of the JIF
being that journals with many letters that get cited get an unfair
advantage due to letters being included in the numerator but not the
denominator.

Is this anomaly corrected in recent JCRs (in which case wikipedia at
least needs to be updated)?
How does that effect time-series comparisons?

Thanks,
Tim.

Charles H. Davis wrote:
> Adminstrative info for SIGMETRICS (for example unsubscribe):
> http://web.utk.edu/~gwhitney/sigmetrics.html
>
> Nice catch, Lokman!  :-)
>
> Chuck
>
> Quoting "Lokman I. Meho" <meho at indiana.edu>:
>
>> Adminstrative info for SIGMETRICS (for example unsubscribe):
>> http://web.utk.edu/~gwhitney/sigmetrics.html
>>
>> Please note that the JIF formula for 2003 impact factor is:
>>
>> Number of Citations Received in 2003 to Citable Items Published in
>> 2001-2002 / Number of Citable Items Published in 2001-2002
>>
>> According to ISI, "Citable Items" are Journal and Review Articles. This
>> means you have to limit your searches/counts to these two document
>> types only.
>>
>> As for the journal in question, note that the journal changed its name
>> to IEEE Transactions on Advanced Packaging. When you take this into
>> consideration, the number of times the 2001-2002 items (i.e., 190
>> journal and review articles)  were cited is in fact 150.
>>
>> 150/190 = .790
>>
>> Best,
>>  Lokman
>>
>> Lokman I. Meho, Ph.D.
>> Assistant Professor
>> School of Library and Information Science
>> Indiana University
>> 1320 East 10th Street, LI 011
>> Bloomington, IN 47405-3907
>> Tel: (812) 856-2323
>> Fax: (812) 855-6166
>> E-mail: meho at indiana.edu
>> http://www.slis.indiana.edu/faculty/meho/
>>
>>
>>
>>
>> Quoting Juan Miguel Campanario <juan.campanario at UAH.ES>:
>>
>>> Adminstrative info for SIGMETRICS (for example unsubscribe):
>>> http://web.utk.edu/~gwhitney/sigmetrics.html
>>>
>>> Hello again
>>>
>>> More missing citations?
>>>
>>> I have downloaded now the CITED JOURNAL DATA TABLE corresponding to
>>> the journal
>>> IEEE TRANSACTIONS ON COMPONENTS AND PACKAGING TECHNOLOGIES,
>>> Year=2003
>>>
>>> According to the ISI the computation is as follows
>>> Cites in 2003 to articles published in: 2002 = 43
>>> 2001= 107
>>> Sum: 150
>>>
>>> Number of articles published in: 2002 = 94
>>>   2001 = 96
>>>  Sum: 190
>>>
>>> Calculation: Cites to recent articles  150 = 0.790
>>>   Number of recent articles  190
>>>
>>> Now, if we go to the “cited journal data table”, it seems that the
>>> number of citations is different (attached file, in ORANGE)
>>>
>>> I obtain 17 citations in 2002  and 18 citations in 2001 (35 citations
>>> that contribute to the Impact Factor)
>>>
>>> I have checked the data, but I cannot find the error…
>>>
>>> Regards
>>>
>>> Juan Miguel Campanario
>>
>>
>