We study to which extent the family of pairs of subspaces of a vector space related to each other via intersection properties determines the vector space. In another language, we study to which extent the family of vertices of the building of a projective space related to each other via several natural respective conditions involving the Weyl distance and incidence determines the building. Thes...

There is a substantial literature on testing for the equality of the cumulative incidence functions associated with one specific cause in a competing risks setting across several populations against specific or all alternatives. In this paper we propose an asymptotically distribution-free test when the alternative is that the incidence functions are linearly ordered, but not equal. The motivati...

Vietnam experienced a dramatic decline in child labor during the 1990s. The aim of this study is to explore in detail this decline and to document the heterogeneity across households in both levels of child labor and in the incidence of this decline in child labor. We find a strong correlation between living standards improvements and child labor so that much of the variation in declines in chi...

Secular trends of the incidence of NCDs are especially important as they indicate changes of the risk profile of a population. The article describes a method for detecting secular trends in the incidence from a series of prevalence data without requiring costly follow-up studies or running a register. After describing the theory, the method is applied to the incidence of diabetes in Denmark.

A framework was developed to estimate the welfare incidence of the 1996 U.S.–Canada Softwood Lumber Agreement among producers in two-processing-stage markets—timberland owners, loggers, and lumber manufacturers—in the U.S. South. Timberland owners are the largest beneficiary whereas lumber manufacturers are the second and loggers the least. Empirically, without considering substitution effects ...

1. Results. An inversive plane is an incidence structure of points and circles satisfying the following axioms: I. Three distinct points are connected by exactly one circle. II. If P, Q are two points and c a circle through P but not Q, then there is exactly one circle c' through P and Q such that cC\c'~ [P]. III. There are at least two circles. Every circle has at least three points. For any p...

In this paper, we formulate an SEIRS epidemic model with two time delays and pulse vaccination. By estabishing stroboscopic map, we obtain the exact infection free periodic solution of the impulsive epidemic system. According to the comparison arguments, we obtain the sufficient conditions of global attractivity of the infection free periodic solution. Moreover, our results show that a large va...

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