Tiiu Ojasoo

Learn More
In order to be able to develop indicators that can measure the scientific and technological productivity of a nation, it is helpful to have at one's command a prior purely descriptive global overview of how various nations stand with respect to each other with regard to world science, i.e., to dispose of a framework for the elaboration of future(More)
This study is a follow-up to a published correspondence Factor Analysis (CFA) of a dataset of over 6 million bibliometric entries. In the previous paper, CFA was used to show how the 48 most prolific countries stand in relation to each with regard to their publication interests in 17 specific disciplinary areas and one multidisciplinary field over the(More)
The aim of this study was to draw attention to the possible existence of "quirk", inbibliographic databases and to discuss their implications. We analysed the time-trends of"publication types" (PTs) relating to clinical medicine in the most frequently searched medicaldatabase, MEDLINE. We counted the number of entries corresponding to 10 PTs indexed(More)
THE IMPACT FACTOR OF MEDICAL JOURNALS: Is a criterion for the assessment of their activity. Three bibliometrical indicators are published every year: the impact factor, the rapidity of citation index, which reflects the upward slope in increased citations and the duration of their actuality, reflecting the downward slope, after the peak. THE JOURNALS USED(More)
Co-authorship analyses are both difficult to perform and interpret. We have devised a new way of calculating and representing hierarchical author networks that depict relationships among authors in a more exhaustive and less equivocal manner than most available automatic analyses. Any structure, however complex, can be broken down into independent(More)
Multivariate statistical analysis of the citation profiles of urology and related journals (i.e. the relative extent to which each journal cites itself and other journals within a set) has highlighted hidden correlations. We reveal the existence of a ‘transatlantic’ rift in citation practice and of a confined discipline-oriented world which interfaces(More)
The aim of the study was to examine the potential of multidimensional analysis, and in particular of correspondence analysis (CA), in bringing to light the influence of sex and age on trace element (TE) concentrations in hair from an unselected French population. Sixteen elements (S, Hg, Se, Zn, Pb, Cd, Ni, Co, Mn, Fe, Cr, Mg, Al, Ca, Cu, Ag) were assayed(More)
OBJECTIVE This study was conducted to determine the efficacy and safety of stent grafts in the treatment of thoracic aortic aneurysms and dissections. METHOD Our health technology assessment method combined a critical review of the literature with experts' opinions. Several databases, useful Web sites, and the gray literature were searched from January(More)