Identification with averaged data and implications for hedonic regression studies

In the estimation of models with averaged data, weighted least squares is often used and recommended as a way of improving the efficiency of the estimator. However, if the size of the different groups is not conditionally independent of the regressand, consistent estimation may not be possible at all. It is argued that in the case of some leading examples of averaged data regression, consistent estimation is possible using the usual weighted estimator.Endogenous sampling; Functional form; Weighted least squares.

Quantiles for Counts

This paper studies the estimation of conditional quantiles of counts. Given the discreteness of the data, some smoothness has to be artificially imposed on the problem. The methods currently available to estimate quantiles of count data either assume that the counts result from the discretization of a continuous process, or are based on a smoothed objective function. However, these methods have several drawbacks. We show that it is possible to smooth the data in a way that allows inference to be performed using standard quantile regression techniques. The performance and implementation of the estimator are illustrated by simulations and an application.Asymmetric maximum likelihood, Jittering, Maximum score estimator, Quantile regression, Smoothing.

Applications Of Autonomous Microfluidic Systems In Environmental Monitoring

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Comparison Of Potassium And Sodium Content In Diet And Non-diet Soft Drinks By Using Capillary Electrophoresis With Capacitively Coupled Contactless Conductivity Detection

Capillary electrophoresis (CE) with capacitively coupled contactless conductivity detection (C4D) was used for determination of sodium and potassium concentrations in diet and non-diet soft drinks. Higher sodium concentrations were found in the diet samples due to the utilization of sodium salts of cyclamate and saccharine as sweeteners. The CE-C 4D method can be used by food industries and health regulatory agencies for monitoring sodium and potassium content, not only in soft drink but in many others food products.3435156Macgregor, G.A., (2001) Am. J. Kidney Dis., 37, pp. S34He, F.J., MacGregor, G.A., (2001) Br. Med. J., 323, p. 497Toseto, A., (2005), Master's Dissertation, Universidade Estadual de Ponta Grossa, BrazilTavares, M.F.M., (1996) Quim. Nova, 19, p. 173Jorgenson, J.W., Lukacs, K.D., (1981) Anal. Chem., 53, p. 1298Da Silva, J.A.F., Lago, C.L., (1998) Anal. Chem., 70, p. 4339Silva, J.A.F.D., Guzman, N., Lago, C.L., (2002) J. Chromatogr. a, 942, p. 249Munhõz, R.A.A., Richter, E.M., Jesus, D.P., Lago, C.L., Angnes, L., (2004) J. Braz. Chem. Soc., 15, p. 523Richter, E.M., Munhõz, R.A.A., Jesus, D.P., Lago, C.L., Angnes, L., (2005) J. Braz. Chem. Soc., 16, p. 1134Carvalho, A.Z., Da Silva, J.A.F., Lago, C.L., (2003) Electrophoresis, 24, p. 2138Gong, X.Y., Hauser, P.C., (2006) Electrophoresis, 27, p. 468Samcova, E., Tuma, P., (2006) Electrophoresis, 18, p. 15