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
計量經濟學模型 ARCH(Autoregressive conditional heteroskedasticity model)中文文獻一般稱作“自回歸條件異方差模型” 計量經濟學家恩格爾(Robert F.Engle),80年代開創(chuàng)性地提出了自回歸條件異方差(AutoRegressive Conditional Heteroscedasticity)模型, 并成功地應用于英國通貨膨脹指數的波動性研究。 (1982) ARCH模型能模擬時間序列變量的波動性的變化,它在計量金融領域中應用較為廣泛。 很多學者從不同角度推廣了ARCH