Help for Astrometrics

Astrometrics is a tool to perform bibliometric searches.
Astrometrics makes a query to NASAADS to gather all
the information needed to evaluate of the bibliometric parameters.

Author 
The author name should be specified as the NASAADS:
Last, First M, one per line: Smith, A

The default search will find all articles starting
with "Smith, A" (e.g. Smith, A.  Smith, Adam  Smith, A. C.).
If more than one Smith, A. exists then try the "exact name
search" with which a strict search is carried out:
a search for "Smith, A." will find only publications from
"Smith, A." and not from "Smith, Adam", nor from "Smith, A. C.".
Multiple authors can be inserted one per line.
There is not a maximum allowed number but if the
search has to be carried out on a large number of authors
we ask to split the full list in ~20 authors per search.

Search options 
Years 
One has to specify the time interval during which the search is performed. First and last years must be typed in.

Bibliographic sources 
Default: refereed articles only.

As in NASAADS there is the possibility to run the
search selecting all the bibliographic sources (including
all nonrefereed material) or limiting the search to
refereed articles (based on NASAADS).

Debugging 
Default: None.

If selected it gives a handle on the calculations carried to compute the relevant bibliometric
parameters. Selecting "First author" it shows all the publications
considered (and in bold face the ones matching the first author request).

Buffering 
Default: active (but enabled, i.e. working).
Astrometrics first tries in its buffer if the requested
information is available before sending a query to NASAADS.

Exact Name 
Default: not active (but enabled, i.e. working)
If activated Astrometrics starts a strict search
on the given author name "Smith, A." will find only
publications from "Smith, A." and not from "Smith, Adam",
nor from "Smith, A. C.".

Best reviews 
If activated Astrometrics selects only specified journals: A&A, A&AS, ApJ, ApJS, Natur, Sci, A&ARv, ARA&A, Icar, JHEAP, MNRAS, PASA, PASJ, PASP, AN , AJ, SSRv, SolPhys, PhysRep, ExA, AcA , ApOpt,
AJS, COGra, NatCo. See ADS Bibliographic Codes: Journal Abbreviations for a complete journals list.

ADS source 
Not to overload a single ADS site, we randomly pick up
one of the ADS mirror.

General Index 
Common logarithm for all columns multiplication except columns Yr and IF. General index is calculated using best reviews.

Bibliometric parameters 
N. articles 
Number of articles published in the time interval selected.

N. articles normalised (Norm. auth.) 
Number of articles published in the time time interval selected. Each article is weighted by the number of authors
and the total number is given by the sum of all the weights.

N. First author 
Number of first author articles except for authors ordered list.

Citations 
Cumulative number of citations for all the selected articles.

Normalised citations (Norm. auth.) 
Number of citations normalised to the number of authors per article. This is done for each article separately and then
these numbers are summed together.

Impact Factor 
Look at http://en.wikipedia.org/wiki/Impact_factor

Each journal is characterised by a number, the Impact Factor (IF),
testifying how much "difficult" is to publish on that journal.
The IF depends also on the year and is computed based on the
number of citations all the articles published in a given year
get in the next year.
We obtained from the web the IF of a number of journals (20, see list)
starting from 1992 up to now. IF for years earlier than 1992 are
taken equal to the 1992 value. For the current year the IF has not been
worked out yet, so we take the one of the year before and update
the table as soon as we get the new ones.
The total IF number is just given by the sum of all the IF for each
single article.

Normalised Impact Factor (Norm. auth.) 
Impact factor normalised to the number of authors
per article. This is done for each article separately and then
these numbers are summed together.

hIndex 
Look at http://en.wikipedia.org/wiki/Hindex

This is the index proposed by J. E. Hirsch http://arxiv.org/abs/physics/0508025
It aims to provide a robust metric of a researcher's impact,
combining quality with quantity. It is defined as the largest
integer for which N articles collected more than N citations.

Normalised hIndex (Norm. auth.) 
It is the hindex normalised to the number of authors.
The list of articles is first sorted according to the
total citations normalised per authors and then the index
is computed. At variance with the hindex the normalised
hindex can be also a real number.

gIndex 
Look at http://en.wikipedia.org/wiki/Gindex

This index has been proposed by L. Egghe (Theory and practice
of the gindex, Scientometrics, Vol. 69, No 1 (2006), pp. 131152).
g index aims to improve on the hindex by giving more weight to
highlycited articles.
It is defined as: given a set of articles ranked in decreasing
order of the number of citations that they received, the gindex
is the (unique) largest number such that the top g articles
received (together) at least g^2 citations.

Normalised gIndex (Norm. auth.) 
As for the normalised hindex, this is computed by
sorting the article citation list normalised per author and
then the gindex algorithm is run.

eIndex 
Look at The eIndex, Complementing the hIndex for Excess Citations

The eIndex is a a necessary hIndex complement, especially for evaluating highly cited scientists or for precisely comparing the scientific output of a group of scientists having an identical hIndex.

Normalised eindex (Norm. auth.) 
As for the normalised hindex, this is computed by
sorting the article citation list normalised per author and
then the eindex algorithm is run.
