Gonzalez-Sagrado, M; et al 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 NUTRICION HOSPITALARIA, 23 (2): 111-118 MAR-APR 2008

[Eugene Garfield]

E-mail Address: gonzalez-sagrado at arrakis.es 

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

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 

Source: NUTRICION HOSPITALARIA, 23 (2): 111-118 MAR-APR 2008  

Language: Spanish 

Document Type: Article 

Author Keywords: bibliometrics 

Keywords Plus: SCIENCE-CITATION-INDEX; SPANISH SCIENTIFIC PRODUCTION; 
HEALTH-SCIENCES; BIOMEDICINE; ASSOCIATION; INDICATORS; QUALITY; SPAIN 

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. 

Addresses: Hosp Univ Del Rio Hortega, Unidad Apoyo Invest, Valladolid 
47010, Spain; Univ Valladolid, Inst Endocrinol & Nutr, Fac Med, E-47002 
Valladolid, Spain; Hosp Univ Del Rio Hortega, Med Interna Serv, 
Valladolid, Spain 

Reprint Address: Gonzalez-Sagrado, M, Hosp Univ Del Rio Hortega, Unidad 
Apoyo Invest, C Rondilla Santa Teresa 9, Valladolid 47010, Spain. 

E-mail Address: gonzalez-sagrado at arrakis.es 

Cited Reference Count: 18 

Times Cited: 0 

Publisher: AULA MEDICA EDICIONES 

Publisher Address: PAEO DEL PINTOR ROSALES, 26, MADRID, 28008, SPAIN 

ISSN: 0212-1611
 
29-char Source Abbrev.: NUTR HOSP 

ISO Source Abbrev.: Nutr. Hosp. 

Source Item Page Count: 8 

Subject Category: Nutrition & Dietetics 

ISI Document Delivery No.: 303PC 

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