A comparative study between linear transfer models of low order and ARX model of high order depending on spatial series

ABSTRACTA comparative study between linear transfer models of low order and ARX model of high order depends on spatial series.The research includes a comparison between efficiency of the different linear transfer function f stationary time spatial series with low order models ( ARX11k , ARMAX2221 ,O.E221 , B.J22221 , pss1 ) and high order ARX model according to the percentage rate of coincidence of the model to the data . The comparison is made on a spatial time series which shows the effect resulted on the biological factors of the soil as a consequence of changes in the chemical factors on one hand and physical factors on the other, and the two factors all are together as an inputoutput model ( multipleuni ) in one time and (multiplemultiple) on another time . It appears that ARX models of high order has a high percentage fit compared with the transfer models of low order .