تقدير دالتي الكمية المطلوبة من القمح و سعره الآنيتين بطريقة المربعات الصغرى الموزونة في السودان للفترة (2000-2014)‎

الملخص EN

The study aimed to build and estimating functions of quantity of wheat and wheat price are simultaneous and discovering binary way causal relationship and forecasting at phenomenon in future; the problem presented in a single model is not enough to acting the phenomenon so that existing to inverse causal relationship for quantity of wheat and wheat price, the simultaneously equation system suffers from Heteroscdasticity.

a significance effect existing inverse causal relationship acting was testing of exogenous variables at endogenous variables, tow stage least squares and weighted least squares was use in estimation by using SPSS package .

The main results is the weighted least squares is solved Heteroscdasticity problem and existing inverse causal relationship to the endogenous variables and exogenous for wheat crop after estimating simultaneous equations system for wheat crop which indicates significance effect to the exogenous variables at endogenous variables, which accord with economical theory .

The study recommended using the weighted least squares to solve Heteroscdasticity problem increasing demand of sorghum at the great technical development by uses modern technical in original industries as experience mixed bread.