统计技术(07)-相关性及正交试验.ppt

统计技术（七）相关性分析及正交试验质量保证部秦成立第一部分第一部分

相关性分析250Kg大卷装络纱机张力01.络纱速度卷绕密度02.压力03.卷绕密度？张力与密度张力(N)卷密度(kg/m3)张力(N)卷密度(kg/m3)1335.9816343.732336.1617344.633337.5018344.254337.4619344.925338.8720345.316338.1921346.577339.1722346.808338.9523348.609339.5824348.6410339.2025349.5711340.8526349.1112340.7827349.3713341.9728349.3214342.8829350.7615343.7330350.00压力与密度压力(N)卷密度(kg/m3)1344.042344.193346.504344.285344.336344.507344.688344.739343.6010344.9111345.0212346.1213345.2214345.4215345.6116345.7017345.8118345.8119344.5520346.00速度与密度速度卷密度(kg/m3)速度卷密度(kg/m3)200346.25350346.36210346.84360346.71220346.99370346.12230346.13380346.24240346.13390346.31250346.20400346.36260346.33410346.06270346.44420346.32280346.98430346.28290346.15440346.87300346.55450346.11310346.89460346.12320346.20470346.97330346.09480346.52340346.61490346.83A工程研究中，变量之间的关系更多地表现为具有随机性的一种“趋势”，即非确定性关系；B欲探索工程研究中变量间的非确定性关系，常用相关分析的方法。C相关分析变量之间有无关系、方向、关系的密切程度；相关性分析用途表示方法：-1?r?101意义：描述两个变量直线相关的方向与密切程度的指标。02相关系数的意义与计算相关系数的计算：相关系数示意：正相关负相关r1-1r0r=1r=-1完全正相关完全负相关例：张力与密度张力(N)卷密度(kg/m3)张力(N)卷密度(kg/m3)1335.9816343.732336.1617344.633337.5018344.254337.4619344.925338.8720345.316338.1921346.577339.1722346.808338.9523348.609339.5824348.6410339.2025349.5711340.8526349.1112340.7827349.3713341.9728349.3214342.8829350.7615343.7330350.00绘制散点图，观察两变量间是否呈直线趋势,从图的散点图可见，张力和卷密度散点有线性趋势存在，而且趋势的方向相同。01编制相关系数计算表02分析步骤如下：1335.981112882.56335.9816343.73256118150.315499.682336.164113003.55672.3217344.63289118769.845858.713337.59113906.251012.518344.25324118508.066196.5433