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| 題 名 | 臺灣地區蔬菜需求函數型式之研究 |
|---|---|
| 作 者 | 李佳珍; | 書刊名 | 嘉義農專學報 |
| 卷 期 | 29 1992.06[民81.06] |
| 頁 次 | 頁133-141 |
| 分類號 | 431.25 |
| 關鍵詞 | 函數; 型式; 臺灣; 需求; 蔬菜; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 本文擬利用Zarembka法來轉換蔬菜需求之各種變數,並藉BOX-COX之最 大概似法估計,以尋求臺灣地區蔬菜需求函數之最適型式,進而瞭解國內蔬菜之 需求彈性。茲將研究結果攝要如下:1.發現三種函數型式(直線型、對數型、一般 型)於顯著水準α=5假設下均具顯著性,但仿似一般函數型式之概似估計值λ=- 1.26為最大;且一般函數型式之迴歸係數估計值 |t|值相對地大於直線型及對 數型,顯示臺灣地區蔬菜需求之最佳函數型式為一般函數型式。2.利用Durbin- H Tests檢定結果,發現「自我相關的假設」於三種函數型式下均被拒絕,此表三 種函數型式均無自我相關之現象產生。3.由需求彈性實證結果顯示,一般函數 型式之相對價格平均值彈性為-0.041,對數型為-0.363,直線型為-0.393,而食品 支出平均值彈性則一般函數型為2.93,對數型為0.67,直線型為0.79,此表相對價 格每上漲1,對蔬菜消費量以一般函數型式減少最小為0.041,就食品支出之平均 值彈性觀之,則以一般函數型式對蔬菜消費量增加最多為2.93,亦言之,一般函 數型式隨食品支出的增加,對蔬菜之支出比率增加也最多。綜合之,即言直線型 或對數型將會高估價格彈性,低估食品支出彈性。 |
| 英文摘要 | To utilize Zarembka method to transfer the variety of vegetable demand,and be estimated by maximum likelihood estimation method of BOX-COX topurchase the moderate model of vegetable demand function, and to understandthe profile of vegetable demand elasticities in Taiwan. Summarize below:(1) Under significant level α=5, Finding three function type (linear type 、log-linear type ' general type) all have significant. But the largest amount be got by similar estimate λ=-1.26 of general function type and then re gression coefficient estimate |t| value of general function type relative to larger than linear type and log-linear type. Showing the best function type of vegetable demand is general type in Taiwan area.(2) Unilizing Durbin-h tests to estimate these results. Finding 「autocorrelation assumption J all be rejected under the tree function type. so these results from three function types had not autocorrelation.(3) According to the identifing results form purchasey range experiment. The relative price average value elasticities of general function type is - 0.041, of log-linear type is -0.0363, of linear type is -0.393. But the food expenditure average value elasticities of general type is 2.93, of log-linear type is 0.67, of linear type is 0.79; So these results describe the relative price improve1 and vegetable consumption with general type is 0.041 and lower than others. According to the food expenditure average value elasticities, Increas ing maximum of vegetable consumption is 2.93 in general function type. That is, The increasing of the food expenditure in general function type. The incresing of rate in vegetable expenditure. Finally linear function type or log-linear function type estimated higher than general function type in price elasticities and lower in the food expenditure elasticities. |
本系統中英文摘要資訊取自各篇刊載內容。