Semiparametric Estimation and Inference in Multinomial Choice Models

The purpose of this paper is to incorporate semiparametric alternatives to maximum likelihood estimation and inference in the context of unordered multinomial response data when in practice there is often insufficient information to specify the parametric form of the function linking the observables to the unknown probabilities. We specify the function linking the observables to the unknown probabilities using a very general flexible class of functions belonging to the Pearson system of cumulative distribution equations. In this setting we consider the observations as arising from a multinomial distribution characterized by one of the CDFs in the Pearson system. Given this situation, it is possible to utilize the concept of unbiased estimating functions (EFs), combined with the concept of empirical likelihood (EL) to define an (empirical) likelihood function for the parameter vector based on a nonparametric representation of the sample's PDF. This leads to the concept of maximum empirical likelihood (MEL) estimation and inference, which is analogous to parametric maximum likelihood methods in many respects.Demand and Price Analysis,

Un accés de teoria

Abstract not availabl

A STRUCTURAL-EQUATION GME ESTIMATOR

A generalized maximum entropy estimator is developed for the linear simultaneous equations systems model. We provide results on large and small sample properties of the estimator. Empirical results illustrate efficiency advantages of the generalized maximum entropy estimator proposed in this study over traditional estimators (e.g., 2SLS and 3SLS).Research Methods/ Statistical Methods,

Reliability evaluation of the Swedish version of Transsexual Voice Questionnaire Male-to-Female (TVQMtF)

There is no validated self-evaluation form in Swedish for male-to- female transsexuals regarding their voice function. The purpose with the present study was to evaluate the reliability of the Swedish version of Transsexual Voice Questionnaire for Male-to-Female (Swe-TVQMtF). Swe- TVQ MtF contains 30 items about voice function. The responses were converted into scores, with a maximum of 120 (highest grade of impairment). Thirty MtF transsexuals filled out the Swe-TVQ MtF two times, with four to seven weeks in between. The results showed that Swe-TVQ MtF had high reliability, as the internal consistency was very high both times (Cronbach’s α= 0,97 and α= 0,98) and the test-retest was excellent (ICC= 0,95; 95% confidence interval 0,90-0,98). A high homogeneity on the ITC analysis of the items was found. Due to the sample size, a factor division could not be confirmed. It was concluded that the Swe-TVQ MtF is a robust instrument in terms of reliability and could be used in speech-language pathology clinics.Det saknas ett validitets- och reliabilitetsprövat självskattningsformulär på svenska gällande röstfunktion för transsexuella män-till-kvinnor. Syftet med denna studie var att reliabilitetspröva den svenska versionen av Transsexual Voice Questionnaire for Male-to-Female Transsexuals (Swe-TVQMtF). Formuläret innehåller 30 påståenden om röstfunktion. Svaren räknas om till poäng där maximal totalpoäng är 120 (hög grad av besvär). Deltagarna var 30 transsexuella män-till-kvinnor som vid två tillfällen, med fyra till sju veckors mellanrum, besvarade Swe- TVQ MtF. Resultaten visade att Swe-TVQ MtF hade hög reliabilitet då den interna konsistensen var mycket hög vid båda tillfällena (Cronbach’s α = 0,97 och α = 0,98) och tillförlitligheten över tid var mycket god (ICC= 0,95; 95% konfidensintervall 0,90-0,98). ITC-analysen visade också att påståendena hade hög homogenitet. Någon tydlig faktorindelning kunde inte bekräftas utifrån studiens urvalsstorlek. Slutsatsen var att Swe-TVQ MtF är ett robust instrument vad gäller reliabilitet och bör kunna användas i logopedisk verksamhet

Des de la impotència

Abstract not availabl

Modelización lineal de los generadores shrinking a través de las leyes 102 y 60

En este trabajo se presenta la modelización lineal de los generadores shrinking y auto-shrinking a través de autómatas celulares lineales uniformes utilizando la ley 102 (o la 60). La linealidad de estos autómatas se puede utilizar para el criptoanálisis de estos generadores de secuencias.El trabajo del primer autor ha sido financiado por una beca postdoctoral de la Generalitat Valenciana con referencia APOSTD/2013/081 y por el proyecto MTM2011-24858 del Ministerio de Ciencia e Innovación del Gobierno de España. El trabajo del segundo autor ha sido financiado por el Ministerio de Ciencia e Innovación del Gobierno de España bajo el proyecto “TUERI: Technologies for secure and efficient wireless networks within the Internet of Things with applications to transport and logistics”, TIN2011-25452

Les cine (-centes) millors

Abstract not availabl