差分需求體系模型之建構與選擇－以臺灣地區總和食品需求爲例

An Application of Differential Demand System on Aggregate Food Groups in Taiwan

10.7086/JAE.200112.0117

江福松(Fu-Sung Chiang)；李仲英(Jonq-Ying Lee)；李皇照(Hwang-Jaw Lee)

差分需求體系 ； 模型選擇 ； 總合食品 ； differential demand system ； model selection ； aggregate food groups

農業經濟半年刊

70期（2001 / 12 / 01）

117 - 148

繁體中文

本研究以臺灣地區總和食品需求為例，探討四種差分需求體系模型（Rotterdam需求體系、差分AIDS需求體系、CBS需求體系、及NBR需求體系）之設定，利用兩套總合食品資料，運用反覆似乎無關迴歸估計需求結構參數，並求算相關價格彈性及支出彈性，以進行不同需求模型間的選擇與比較。研究結果顯示，不論是利用糧食平衡表資料或是利用年報資料推估的消費資料，在模型的設定選擇上，皆以Rotterdam需求體系較佳，體系R^2(下標 s)分別為0.97與0.91；此外，研究也發現資料的處理方式與產品分類明顯地影響需求彈性估計值。

Two sets of aggregate food consumption data, one was compiled from Food Balanced Sheet and the other was constructed from the Year Books Published by Government were used to study how food expenditure and prices influenced consumer demand for food items in Taiwan. Alternative differential demand models combining the features of the Rotterdam model and the Almost Ideal Demand System were tested. Empirical results show that Rotterdam-type responses more suitable to describe Taiwanese consumer food consumption behavior than do the other specifications. The system R^2(subscript s) obtained from these two aggregate food consumption data sets are 0.97 and 0.91. In addition, this study found that how individual food items were grouped into broad categories obviously influenced estimation results.

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