对于线性回归模型中平衡LS估计这一类含参数$t$和参数矩阵$L$的估计, 进一步讨论了$t$和$L$的取值对平衡LS估计优良性的影响, 得到了平衡LS估计在某些准则
下优于OLS估计的条件.

This paper is concerned with an initial-boundary problem of nonconvex scalar conservation laws with two pieces of constant initial data and
constant boundary data. Under the condition that the flux function has one inflection point, by the structure of weak entropy solution of the corresponding initial value problem and the boundary entropy condition developed by Bardos-Leroux-Nedelec, we give a construction method for the global weak entropy solution of the initial-boundary value problem and clarify the solution structure nearby the boundary. In contrast to the initial-boundary value problem for strictly convex
scalar conservation laws, the weak entropy solution of the initial-boundary value problem for nonconvex scalar conservation laws includes the following new interaction type: a contact or non-contact shock collides with the boundary and a new non-contact shock wave rebounds from the boundary.