本研究对我区1996～2 0 0 2年的中小学生营养不良率数据进行三种曲线拟合(线性模型、二次项曲线与三次项曲线) ,并进行比较,现分析如下。1　资料和方法营养不良率数据来源于本站学校卫生科(表1～2 ) ,用SPSS软件包进行曲线拟合并绘图〔1〕。2　所用命令　见表1、2。表1　营养不 In this study, three kinds of curve fitting (linear model, quadratic curve and cubic curve) of the malnutrition rate of primary and middle school students in our district from 1996 to 2002 were conducted and compared. The analysis is as follows. 1 Materials and Methods Malnutrition rate data from the school health school (Table 1 ~ 2), using SPSS software package for curve fitting and plot [1]. 2 The commands used are shown in Table 1 and 2. Table 1 nutrition not