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计量资料的逻辑处理凡用测量方法获得的数值,大多数具有单位者,如身高为多少厘米,体重为多少公斤,血糖浓度为多少毫克％等,表示定量结果的资料,称为计量资料。一、计量资料的主要统计指标 1.均数:一般系指算术均数,用x表示。正态分布或近似正态分布的资料常常用均数来表示其集中趋势与平均水平。 (一)小样本不分组资料均数的计算法:如样本中包含n个数值(称为变量值),计算均数时,只要求出n个变量值的总和,再除以变量值的个数n,即得。公式为: x=(x_1+x_2+x_3+…+x_n)/n =(∑x)/n (1)
Logic processing of measurement data The values obtained by the measurement method are mostly measured by the unit, such as how many centimeters in height, how many kilograms of body weight, and how many milligrams of blood glucose concentration, etc., indicating quantitative results, which are called measurement data. First, the main statistical indicators of measurement data 1. Mean: Generally refers to the arithmetic mean, represented by x. Data with a normal distribution or a near-normal distribution are often expressed as an average to indicate their central tendency and average level. (I) The calculation method for small samples without grouping data: If the sample contains n numbers (called variable values), when calculating the mean, just calculate the sum of the values of n variables and divide by the number of variables. Number n, that is, too. The formula is: x=(x_1+x_2+x_3+...+x_n)/n =(∑x)/n (1)