[Eval of two methods for correcting the impact factor using the investigation done at the "Del Rio Hortega" University Hospital (1999-2004) as the data source] Gonzalez-Sagrado, M et al, J L Nutr Hosp 23 (2) : 111-8 2008 Mar-Apr

[Eugene Garfield]

Email Address: gonzalez-sagrado at arrakis.es 

PubMed ID: 18449446 

Publication Type: English Abstract; Journal Article 

Title: [Evaluation of two methods for correcting the impact factor using 
the investigation done at the "Del Rio Hortega" University Hospital (1999-
2004) as the data source] 

Vernacular Title: Evaluacion de dos metodos de correccion del Factor de 
Impacto utilizando la investigacion del H.U. "Del rio Hortega" (1999-2007) 
como fuentes de datos. 

Author(s): Gonzalez-Sagrado, M; Luis Roman, D A de; Conde-Vicente, R; 
Izaola, O; Aller, R; Perez-Castrillon, J L 

Source: Nutr Hosp 23 (2) : 111-8 2008 Mar-Apr 

Language: Spanish 

Abstract: BACKGROUND AND OBJECTIVE: To adjust the Impact Factor (IF) 
provided by the Institute for Scientific Information (ISI) is necessary 
for improving bibliometric analysis among the various areas of knowledge. 
Our objective was to evaluate two parameters (the maximum and the median 
value of each subject area) for IF adjustment using the original (not 
corrected) IF as the reference method in a tertiary hospital biomedical 
investigation model. MATERIAL AND METHOD: We retrieved articles from 
Hospital Universitario "Del Rio Hortega" from Valladolid (Spain) for the 
period 1999-2004 as data source. We have describe the characteristics of 
the followed IF distributions: IF Corrected by the Maximum value 
(IFCORMAX), IF Corrected by the Median value (IFCORMED) and IF without 
adjustments (IF). Besides, we have analyzed both the inter-annual and the 
inter-subject differences obtained by the three methods. RESULTS: The 
three analyzed IF series shown not normal distributions that are 
positively skewed. The IF adjusted by the median showed the highest 
coefficient of variation (CV = 357.3%). The IF adjusted by the Maximum 
value increased the "weight" of journals with the highest not corrected IF 
for each subject category. Inter-annual differences were similarly 
estimated by the three methods. The IF adjusted by the median increased 
the inter-subject difference from 7.3% to 12.4%. CONCLUSIONS: Our results 
suggests that IF adjusted by the maximum value of each discipline is the 
best method to correct the ISI-IF values, because journals with the high 
IF are always rewarded, while IF adjusted by the median infra-estimated 
most of them.  

Address: Unidad de Apoyo a la Investigacion, Hospital Universitario Del 
Rio Hortega, Valladolid, Spain. 
gonzalez-sagrado at arrakis.es 

Citation Subset: Index Medicus 

ISSN: 0212-1611 

NLM Unique ID: 9100365 

Country: Spain 

Date Created: 01 May 2008