We consider a random design model based on independent and identically distributed pairs of observations (Xi, Yi), where the regression function m(x) is given by m(x) = E(Yi|Xi = x) with one independent variable. In a nonparametric setting the aim is to produce a reasonable approximation to the...

A time series analysis was performed on medical scheme statistics with the aim of determining current and future demographic and economic trends. This would enable one to reach a better perspective on the current and future financial dilemma presently experienced by medical schemes. Data for the...

In this paper we examine several approaches to detecting changes in the adjustment coefficients in cointegrated VARs. We adopt recursive and rolling techniques as mis-specification tests for the detection of non-constancy and the estimation of the breakpoints. We find that inspection of the...

A recent outbreak of bird flu or avian influenza (AI), an especially highly pathogenicstrain (HPAI) of H5N1, started in Hong Kong in January 2003 and caused 159 humandeaths in Asia, Africa and Europe through early 2007. In addition, this outbreak resultedin millions of slaughtered birds and...

The unusual rise and fall of non-monetary trade (NMT) in the Russian transition has been a subject of heated debates. Yet, this phenomenon is often viewed as a peculiarity that one cannot explain by economic considerations alone. In this paper we show that the resort to NMT was a rational,...

In the doctoral dissertation, we consider problems of testing and estimating changed segment with unknown starting position and duration of epidemic state in the autoregressive first-order model. The proposed tests are based on partial sums of model residuals and model-parameter...