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169.655  Articles
1 of 16.967 pages  |  10  records  |  more records»
The necessary condition for the presence of biased assessment by some test is differential item functioning in different groups of test takers. The ideas of some statistical methods for detecting Differential Item Functioning are described in the given ar... see more

The necessary condition for the presence of biased assessment by some test is differential item functioning in different groups of test takers. The ideas of some statistical methods for detecting Differential Item Functioning are described in the given ar... see more

It is clear that the likelihood ratio statistics plays an important role in theories of asymptotical estimation and hypothesis testing. The aim of the paper is to investigate the asymptotic properties of likelihood ratio statistics in competing risks mode... see more

The Beta-Skew-t-EGARCH model was recently proposed in literature to model the volatility of financial returns. The inferences over the parameters of the model are based on maximum likelihood method. These estimators have good asymptotic properties, howev... see more

Existen una serie de parámetros que caracterizan las pruebas diagnósticas, como son la sensibilidad, la especificidad, los valores predictivos y los cocientes de probabilidad. Solo estos últimos nos permiten el cálculo de la probabilidad del paciente de p... see more

The objective of this study was to find out the empirical data of the index of crossing Differential Item Functioning (DIF) and the difference of sensitivity among methods in detecting crossing DIF according to the Item Response Theory. The study used qua... see more

Approximation of Non-central Chi-square distribution as an empirical distribution of log-likelihood ratio test statistics (-2log?; abbreviated as LRT) has been a concern in the field of structural equation modeling. Under extremely severe misspecification... see more

The Gamma and Log-Normal distributions are frequently used in reliability to analyze lifetime data. The two distributions overlap in many cases and make it difficult to choose the best one. The ratio of maximized likelihood (RML) has been extensively used... see more

Evaluación de la Escala de Alvarado en el diagnóstico clínico de la apendicitis aguda Evaluación de la Escala de Alvarado en el diagnóstico clínico de la apendicitis agudaIntroducción: la apendicitis aguda constituye la primera causa de intervenciones quirúrgicas de urgencia en cirugía general. Su diagnóstico continúa siendo eminentemente clínico existiendo herramientas como el puntaje de Alvarado que permiten realizar una mejor evaluación de la condición. Objetivo: evaluar la utilidad de la Escala de Alvarado en el diagnóstico clínico de la apendicitis aguda en el Hospital Universitario "Carlos Manuel de Céspedes". Material y Métodos: se realizó un estudio de evaluación de medios diagnósticos donde fueron valorados los pacientes con dolor abdominal agudo y diagnóstico presuntivo de apendicitis aguda mediante la utilización de la escala de Alvarado. De la misma se evaluó su sensibilidad, especificidad, valores predictivos y cocientes de probabilidades. Resultados: del total de pacientes incluidos (533), se confirma la enfermedad durante la laparotomía en el 90,4%. Los mejores valores diagnósticos de la enfermedad para la escala fueron aquellos con puntuación superior a 7 (sensibilidad 55.4, especificidad 96.1). La migración del dolor fue el elemento específico del test de mayor valor para el diagnóstico (sensibilidad 81.9, especificidad 94.1). El test no permitió una diferenciación precisa entre el puntaje y el posible estado anatomopatológico de la enfermedad. Conclusiones: la escala de Alvarado constituye una herramienta útil en el diagnóstico clínico de la inflamación del apéndice cecal, fundamentalmente para puntuaciones mayores de 7. La migración del dolor constituyó el elemento específico del puntaje de mejor valor diagnóstico. Esta no permitió discriminar de forma adecuada el posible estado anatomopatológico según el valor de la puntuación obtenida.Palabras clave: apéndice, apendicitis, apendicectomía, diagnóstico clínico, cirugía, ultrasonografía, patología, laparoscopia.ABSTRACTIntroduction: acute appendicitis is the leading cause of emergency surgery in general surgery. Its diagnosis remains eminently clinical, and there are tools like the Alvaradós score that allow a better assessment in the accurate diagnosis of the condition. Objective: to evaluate the usefulness of Alvaradós Score in the clinical diagnosis of acute appendicitis. Material and Methods: an evaluation study of diagnostic tools was carried out, in which an assessment was performed on patients with acute abdominal pain and presumptive diagnosis of acute appendicitis. The Alvaradós scale was used, by means of which sensitivity, specificity, predictive values, and likelihood ratios were assessed. Results: of all patients (533), appendicitis was confirmed at laparotomy in 90,4%. Best diagnostic values of the disease for the scale values were those higher than 7 (sensitivity 55.4, specificity 96.1) score. The migration of pain was the specific component of higher value for the diagnosis (sensitivity 81.9, specificity 94.1). The test did not allow an accurate differentiation between the score and the possible anatomic-pathological status of the disease. Conclusions: The Alvaradós scale is a useful tool in the clinical diagnosis of inflammation of the appendix, primarily for scores higher than 7. The migration of pain was the specific item of the score with better diagnostic value. This did not allow discriminating adequately the possible anatomic-pathological status of the condition based on the value of the score.Keywords: appendix, appendicitis, appendectomy, surgery, ultrasonography, pathology, diagnosis, laparoscopy.

Objetivo: evaluar la utilidad de la Escala de Alvarado en el diagnóstico clínico de la apendicitis aguda en el Hospital Universitario "Carlos Manuel de Céspedes". Material y Métodos: se realizó un estudio de evaluación de medios diagnósticos donde fueron... see more

1 of 16.967 pages  |  10  records  |  more records»