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<br />5 <br /> <br />and (3) appraisals of economic impacts where such impacts are <br />expressed in terms of value of production or income. The latter <br />point may require price adjustment in the OBERS':' projections in <br />which agricultural output i's valued at 1967 prices. <br /> <br />) <br /> <br />Special circumstances will require adjustment and/or the develop- <br />ment of supplemental estimates. Specific cases of some importance <br />include the following: (1) pricing of commodities not included in the <br />price tables; (2) determination of price differentials within States; <br />(3) determination of price differentials to reflect product quality <br />differences from the average represented by published price data; <br />and (4) adjustments to reflect the impacts of project Or program <br />actions on market prices. These and other special price problems <br />should be approached in such a manner as to achieve consistency <br />with the published estimation of current normalized prices. <br /> <br />.. <br /> <br />Commodities not Covered in Price Tables--1n circumstances where <br />price data for One or more specific commodities are needed, they <br />may be developed by the same type of computation used in generating <br />price data included in this document. If a price for celery is <br />required, for example, a current normalized price may be derived <br />as follows: (1) establish a 1972 trend value with a linear regression <br />for the II-year period 1962-1972, and (2) adjust upward by 22.7 <br />percent (the increase in the index of prices received by farmers <br />from the period July 1971 -June 1912 to the period July 1972- <br />June 1973). Repeat step I, establishing a 1973 trend value with a <br />linear regression for the ll-year period, 1963-1973. Selection of <br />the normalized price should then be made on the basis of the <br />criterion noted in the Price Level Adjustments section of the <br />Computational Procedures. A simple average may be used in lieu <br />of the 1973 trend value where a definite trend is not apparent upon <br />inspection of past prices. <br /> <br />I <br />"/ <br /> <br />Forest product prices are not included in these tables. Although <br />not normalized, information On prices for forest products can be <br />obtained from "The Demand and Price Situation for Forest Products, <br />1972-73, Misc. Publication No. 1239, Forest Ser.vice, U. S. Depart- <br />ment of Agriculture, July 1973." The user should be cautioned that <br />in order to be compatible with the agricultural prices in this report, <br />the stumpage prices should be adjusted to reflect value added from <br />harvesting. <br /> <br />n <br />.\ <br /> <br />':' OBERS - Available from the Superintendent of Documents, <br />Stock #5245-0012, $15.50. <br /> <br />~~ <br />GPO,~O <br />