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A multi-stage almost ideal demand system: the case of beef demand in colombia
(Universidad Nacional de Colombia, 2013)
The main objective in this paper is to obtain reliable long-term and shorttermelasticities estimates of the beef demand in Colombia using quarterlydata since 1998 until 2007. However, complexity on the decision process ...
Improved exponential type ratio estimator of population variance
(Universidad Nacional de Colombia, 2013)
This article considers the problem of estimating the population varianceusing auxiliary information. An improved version of Singh’s exponential typeratio estimator has been proposed and its properties have been studied ...
The family of log-skew-normal alpha-power distributions using precipitation data
(Universidad Nacional de Colombia, 2013)
We present a new set of distributions for positive data based on a skewnormalalpha-power (PSN) model including a new parameter which in turnmakes the log-skew-normal alpha-power (LPSN) model more flexible thanboth the ...
Properties and inference for proportional hazard models
(Universidad Nacional de Colombia, 2013)
We consider an arbitrary continuous cumulative distribution functionF(x) with a probability density function f(x) = dF(x)=dx and hazard functionhf (x) = f(x)=[1