1.a curved shape in the vertical plane that spans an opening
2.a curved bony structure supporting or enclosing organs (especially arches of the feet)
3.a passageway under an arch
4.(architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it
5.(of persons) highest in rank or authority or office;
his arch rival
6.(used of behavior or attitude) characteristic of those who treat others with condescension
7.expert in skulduggery;
an arch criminal
1.form an arch or curve;
her back arches
计量经济学模型 ARCH(Autoregressive conditional heteroskedasticity model)中文文献一般称作“自回归条件异方差模型” 计量经济学家恩格尔(Robert F.Engle),80年代开创性地提出了自回归条件异方差(AutoRegressive Conditional Heteroscedasticity)模型, 并成功地应用于英国通货膨胀指数的波动性研究。 (1982) ARCH模型能模拟时间序列变量的波动性的变化,它在计量金融领域中应用较为广泛。 很多学者从不同角度推广了ARCH