la autoridad

a) FICHA HEMEROGRÁFICA:

Title: AP-MEDIAN PROBLEM WITH DISTANCE SELECTION
Author: Stefano Benati, SergioGarc´iaYear: 2010
Source: Dipartimento di Sociologiae Ricerca Sociale, Universita de gli Studidi Trento, Trento,
Departamento de Estadistica, Universidad CarlosIII,Legan´es(Madrid), Spain
Keywords: p-median problem, distance selection, radius formulation
Main ideas:
• Integer linear formulations of p-median with distance selection

• This formulation isnon-linear because of the quadratic terms in the objective function

• The model that we introduce in this paper assumes that the set F is large: not all statistical variables are relevant for clustering.Critical:
This paper introduces an extension of the p-median problem and its application to clustering, in which the distance/dissimilarity function between units is calculated as the distance sum onthe q most important variables. These variables are to be chosen from a set of m elements, so a new combinatorial feature has been added to the problem, that we call the p-median model with distanceselection. This problem has its origin in cluster analysis, often applied to sociological surveys, where it is common practice for a researcher to select the q statistical variables they predict willbe the most important in discriminating the statistical units before applying the clustering algorithm.




Titulo: GANADEROS Y COMERCIANTES EN SINCELEJO

Autor: JOAQUIN VILORIA DE LA HOZAño: 2001
Fuente: CENTRO DE INVESTIGACIONES ECONOMICAS DEL CARIBE COLOMBIANO
Palabras claves:Comercio, Periodo, Exportador, Cultivo, Economía

Ideas principales:
• Antonio de la Torre y Miranda llegó a esta subregión de la provincia de Cartagena en la década de 1770, encontró un número...