Abstract
HE purpose of this paper is to report the results of a study of the total supply of milk by Iowa farmers. The objective of the study was structural analysis-measurement of factors determining milk supply. Although the results should be useful in forecasting, finding good forecasting equations was not one of our specific objectives. Annual time series data covering the state of Iowa were studied by multiple regression analysis. Within the last few years Halvorson has used time series data to study total United States milk supply2 and to study milk production per cow in the United States and in each of six regions.3 Brandow has analyzed time series data for several groups of states and for some individual states in an effort to find the determinants of dairy cow numbers and of milk production per cow.4
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