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<br />I <br />I <br />1 <br />I <br />I <br />I <br />I <br />I. <br />I <br />I <br />I <br />I <br />I <br /> <br />< <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />~~.~"? <br />u~~~J~ <br /> <br />Michigan State University, eliminated significant amounts of redundancy, <br />streamlined model operation, and improved model structure. This activity <br />involved changing the initial year of all components to 1976. Model man- <br />agement was enhanced by incorporatin9 all national policy variables into a <br />single source. Involvement in the High Plains Study in 1980 provided the <br />opportunity to update the resource side of the model with state land infor- <br />mation from the 1978 Agricultural Census and the 1977 Soil Conservation <br />Service land inventory. Peer review during this study has led to the rees- <br />timation of many of the model parameters and some changes in structural <br />equations. <br /> <br />B. OVERVIEW OF THE NIRAP STRUCTURE <br /> <br />The NIRAP computer model is composed of 5 components as shown in Fig- <br />ure II-I. These components are: Constant Price Supply, Constant Price <br />Demand, Aggregate Farm Output, Commodity Production and Utilization, and <br />Land Use and Regional Shares of Production. The first two components pro- <br />vide various inputs to the other three submodels. The latter three compo- <br />nents are ranked in a hierarchy where the above component feeds information <br />to the lower component for subsequent data input. A brief definition of <br />each component follows: <br />Constant Price Supply - provides basic information on changes in supply to <br /> <br />11-4 <br />