การวิเคราะห์ข้อมูลเกี่ยวกับเนื้อที่เพาะปลูกพืช และจำนวนโคกระบือ ที่ได้จากกระทรวงเกษตรและสหกรณ์ สำนักงานสถิติแห่งชาติ และกระทรวงมหาดไทย / ศศิธร เชื้อเมืองพาน = An analysis of data on cultivated area and number of cattle provided by Ministry of Agriculture & Co-operatives National Statistical Office and Ministry of Interior
There are many offices that collect the same types of data, but the quality and quantity of data are different. This causes a problem to users because they do not know which source of data is the most suitable and reliable for their research. This research studied the method of collecting data by Ministry of Agriculture & Co – operatives, National Statistical office, The Sugar Interior. The data collected included planted area of rice, maize, cassava, kenaf, sugar cane in crop year 1977/78 to 1979/80 and the number of buffaloes in 1977 to 1979. This research also studied factors that cause differences in data. The differences in data were tested by using the Analysis of Variance and Paired Observations at the probability level of 0.05. In addition the reliability of data in terms of the objectives for collecting the data, the period of time and the method of collecting data were also studied. The cause of differences of data from this study can be separated into two types. The first type includes differences in basic characteristics of data such as definitions, coverage, of data and time reference. The second type includes not meeting the objectives in data collection, the period of time and method of collecting data. Data from Center for Agricultural Statistics, Department of Agricultural Extension, Agricultural Census 1978, The Sugar Institute, Department of Livestock Development and The Local Administration Department have high reliability. On the other hand, data from Village Surveys of National Statistical office is of unsatisfactory quality. Details concerning sources and level of data from this study that can be satisfactorily used for other research are shown below. Source Level data Center for Agricultural Changwat, regions, rice, maize, cassava, Statistics whole kingdom kenaf 1977/78 – 1979/80 and Number of buffaloes 1977 – 1979, Department of Agricultural Changwat, regions, rice 1977/78 – 1979/80 extension whole kingdom maize 1978/79 – 1979/80 cassava 1977/78 – 1979/80 kenaf, sugar cane 1977/79 – 1979/80, ampurrice 1977/78 – 1979/80 maize, cassava, kenaf, sugar cane 1978/79 – 1979/80 Agricultural Census Changwat, regions, rice, cassava, sugar cane 1978 whole kingdom 1977/78 and number of Buffaloes 1978 ampur rice, maize, cassava, kenaf, sugar cane 1977/78 tambon, village rice, maize, cassava, kenaf, sugar cane 1977/78 and number of buffaloes 1978 Village Surveys Changwat, regions, number of buffaloes 1977 whole kingdom tambon, village rice, maize, cassava, kenaf, sugar cane 1978/79 and number of buffaloes 1977, 1979 The sugar Institute Changwat, regions, sugar cane in crop year Whole kingdom1977-78 to 1979 – 80 Department of Livestock changwat, regions,number of buffaloes 1977-1979 Development whole kingdom The Local Administration ampur, changwat, number of buffaloes 1977 – 1979 Department rigions, whole kingdom Data obtained often crop year 1977/78 may be used with the same confidence as crop year 1977/78 if the method of collecting data in that crop year has not changed from crop year 1977/78. However, the weights or the numbers chosen to quantify the level of importance in various aspects in order to serve as criterion of validity of the data were those considered appropriate by the researcher. If these weights or numbers were differently assigned, the results of this research would have been different.