Riesgo relativo, sensibilidad y especificidad: un enfoque desde el análisis matemático y el álgebra lineal / Relative risk, sensitivity, specificity: an approach from mathematical analysis and linear algebra
Rev. cuba. inform. méd
; 3(2)jul.-dic. 2011.
Article
in Es
| LILACS, CUMED
| ID: lil-739186
Responsible library:
CU1.1
RESUMEN
El riesgo relativo (RR), la razón de productos cruzados (OR), la especificidad (E) y la sensibilidad (S) constituyen medidas de resumen para variables cualitativas de interés en Medicina. Se presenta el RR como una función continua de dos variables y se analiza la condición para la cual este se aproxima a la OR a partir de su desarrollo en serie de potencias. La sensibilidad, la especificidad y los valores predictivos (VPP y VPN) se analizan como funciones continuas de una variable en todo su dominio, con un comportamiento asintótico característico. A partir del estudio de un sistema de ecuaciones lineales homogéneo se deduce una ecuación general que vincula S, E, VPP y VPN y se discuten diferentes casos de interés(AU)
ABSTRACT
The relative risk (RR), the odds ratio (OR), the specificity (E) and the sensitivity (S) are measures for qualitative variables of medical interest in Medicine. It is analysed the RR as a continue function of two variables as well as the conditions by which it is approximated to the OR by means of a power series expansion. It is analysed too the sensitivity, the specificity and the predictive values as continue functions of one variable in all its domains of definition as well as the asymptotic behaviour of these functions. It is discussed different interesting cases by means of a system of linear equations in S, E, VPP, VPN(AU)
Key words
Full text:
1
Collection:
01-internacional
Database:
CUMED
/
LILACS
Main subject:
Predictive Value of Tests
/
Mathematical Concepts
Type of study:
Diagnostic_studies
/
Etiology_studies
/
Prognostic_studies
/
Qualitative_research
/
Risk_factors_studies
Limits:
Female
/
Humans
/
Male
Language:
Es
Journal:
Rev. cuba. inform. méd
Journal subject:
INFORMATICA MEDICA
/
SERVICOS DE SAUDE
Year:
2011
Document type:
Article
Affiliation country:
Cuba
Country of publication:
Cuba