Examinando por Materia "regression analysis"
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Ítem Labor Informality: Choice or Sign of Segmentation? A Quantile Regression Approach at the Regional Level for Colombia(Blackwell Publishing Ltd, 2017-11-01) García G.A.; Universidad EAFIT. Departamento de Economía y Finanzas; Research in Spatial Economics (RISE)The labor market in developing countries is remarkably heterogeneous, with a small productive formal sector characterized by high wages and attractive employment conditions, and a large informal sector characterized by low productivity and volatile wages. The informal sector is particularly diverse. In this paper, we examine the heterogeneity of the informal sector at the regional level in Colombia. In general, our findings suggest that both voluntary and involuntary informal employment co-exist by choice and as a consequence of labor market segmentation. We also find that there are striking differences in labor market characteristics across cities, particularly with respect to informal employment.Ítem Rationing of Formal Sector Jobs and Informality: The Colombian Case(John Wiley and Sons Ltd, 2018-07-01) García G.A.; Badillo E.R.; Universidad EAFIT. Departamento de Economía y Finanzas; Research in Spatial Economics (RISE)We analyse the factors that affect the decision to find employment in the formal or informal sectors taking into account the fact that there is a rationing of formal sector jobs and hence a job queue to enter that sector. Using data from Colombia, we confirm that formal job rationing does exist and that it affects around 62 per cent of the workers that find themselves in the informal labour market. Further factors determining actively seeking formal employment include personal traits, the characteristics of human capital and of the household and the wage premiums associated with working in the formal sector. Copyright © 2017 John Wiley & Sons, Ltd. Copyright © 2017 John Wiley & Sons, Ltd.Ítem Simultaneous Fluorometric Determination of Chlorophylls a and b and Pheophytins a and b in Olive Oil by Partial Least-Squares Calibration(AMER CHEMICAL SOC, 2003-11-19) Diaz, TG; Meras, ID; Correa, CA; Roldan, B; Caceres, MIR; Diaz, TG; Meras, ID; Correa, CA; Roldan, B; Caceres, MIR; Universidad EAFIT. Departamento de Ingeniería de Producción; Ingeniería, Energía, Exergía y Sostenibilidad (IEXS)The resolution of quaternary mixtures of chlorophylls a and b and pheophytins a and b has been accomplished by partial least-squares (PLS) multivariate calibration, applied to the fluorescence signals of these pigments. The total luminescence information of the compounds has been used to optimize the spectral data set to perform the calibration. After preliminary studies, a method is described in acetone media, to avoid emulsions with the olive oil samples. Different scanning paths have been selected for each method. For the simultaneous determination of the pigments in olive oil samples, a comparative study of the results found by using excitation, emission, and synchronous spectral data, as analytical signal, was performed. The excitation spectra were selected as the better analytical signals for the determination of the pigments in olive oil samples. The optimum wavelength range to record the excitation spectra (?em = 662 nm) was selected to minimize the contribution of pheophytin a and to maximize the contribution of the other pigments, which are the minor constituents in olive oil. Determination of these pigments in olive oil samples was effected from the excitation spectra of dissolutions o suitable aliquots in acetone. Recovery values from olive oil, spiked with chlorophylls a and b and pheophytins a and b, were in the ranges of 70-112, 71-111, 76-105, and 82-109%, respectively.