在贸易统计中, 对于限额以下批零贸易餐饮企业及个体的销售额普遍采用抽样调查方法进行统计。经过多年的探讨和实践,采用区域二相抽样调查比较符合当前我国的实际情况。样本单位数量的确定原则一般情况下,确定样本量需要考虑调查的目的、性质和精度要求,以及实际操作的可行性、 In trade statistics, the sales of wholesale and retail trade catering enterprises and individuals below the limit are generally surveyed by means of sample surveys. After years of exploration and practice, the use of regional two-phase sampling survey more in line with the current situation in our country. The principle of determining the number of sample units Under normal circumstances, to determine the sample size need to consider the purpose of the survey, the nature and accuracy requirements, as well as the feasibility of practical operation,