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近年来房地产业发展迅猛,房价快速走高,对经济发展和社会稳定产生了重大影响,因此房价研究具有重要的社会价值和经济意义.文章通过散点图及其拟合曲线展示不同协变量和响应变量之间的相关关系,提出半变系数模型建模美国埃姆斯市的房价问题.文章采用剖面最小二乘法研究7个协变量:地面以上的居住面积、地面以上的房间总数(不包括卫生间)、卫生间总数、房屋整体建材质量和品质、地下室面积、车库面积、建造年份与埃姆斯市房价之间的回归关系,为房价预测研究作准备.研究结果表明半变系数模型在探索美国爱荷华州埃姆斯市房价方面表现较好.因此,文章提供了一种利用半变系数模型同时学习高维数据线性和交互关系的有效方法. 相似文献
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The purpose of this paper is to investigate the boundedness and global attractivity of
the complex Lorenz system:
x y x ? ? ? ? ?, y x cy dxz ? ? ? ? , ? ?
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,
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z z xy xy ? ? ? ? ?
where
? ? ? , , , , c d
are real parameters,
x
and
y
are complex variables,
z
is a real
variable, an overbar denotes complex conjugate variable and dots represent
derivatives with respect to time. This system arises in many important applications in
laser physics and rotating fluids dynamics. It is very interesting that we find that this
system exhibits chaos phenomenon for the given parameters. Using generalized
Lyapunov-like functions, we prove the existence of the ultimate bound set and the
globally exponentially attractive set in this generalized complex Lorenz system. The
rate of the trajectories is also obtained. Numerical simulations show the effectiveness
and correctness of the conclusions. Finally, we present an application of our results
that obtained in this paper. 相似文献
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Numerical Algorithms - In this paper, we study a special instance of the split inverse problem (SIP), which is the split variational inclusion problem (SVIP). Three simple iterative methods for... 相似文献
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