第八章 多组独立定量资料的统计分析本章应用的 Stata 命令为：单因素方差分析oneway 应变量 分组变量, bonferroni 非参数多组比较kwallis 应变量 , by(分组变量)例 8-1 为讨论茶多酚保健饮料对急性缺氧的影响，某讨论者将 60 只小白鼠随机分为低、中、高三个剂量组和一个对比组，每组 15 只小白鼠。对比组给予蒸馏水 0.25ml 灌胃，低、中、高剂量组分别给予2.0g∕kg、4.0g∕kg、8.0g∕kg 的饮料溶于 0.2～0.3ml 蒸馏水后灌胃。每天一次，40 天后，对小白鼠进行耐缺氧存活时间试验，结果如表 8-1。试比较不同剂量的茶多酚保健饮料对延长小白鼠的平均耐缺氧存活时间有无差别。表 8-1 各组小白鼠耐缺氧时间组别耐缺氧时间（min）对比组（）20.7922.9127.2119.3417.8523.7922.6018.5323.2320.1426.7119.3617.2224.1315.85低剂量组（）22.2224.7421.5319.6625.8929.1018.9318.6426.3925.4920.4322.6929.6720.3622.74中剂量组（）28.5628.6725.2830.3823.1323.4728.8829.6224.8234.6422.2929.2225.6335.1232.32高剂量组（）31.9337.9439.7627.9429.6534.2332.6329.1339.6236.1528.8524.0729.2935.2436.13Stata 数据格式为：gx120.79122.91127.21119.34117.85123.79122.6118.53123.23120.14126.71119.36117.22124.13115.85222.22224.74221.53219.66225.89229.1218.93218.64226.39225.49220.43222.69229.67220.36222.74328.56328.67325.28330.38323.13323.47328.88329.62324.82334.64322.29329.22325.63335.12332.32431.93437.94439.76427.94429.65434.23432.63429.13439.62436.15428.85424.07429.29435.24436.13：四个总体均数相等：四个总体均数不等或不全相等 Stata 命令为：oneway x g结果为： Analysis of Variance Source SS df MS F Prob > F------------------------------------------------------------------------Between groups 1205.79582 3 401.931941 26.09 0.0000 Within groups 862.796912 56 15.4070877------------------------------------------------------------------------ Total 2068.59273 59 35.0608938Bartlett's test for equal variances: chi2(3) = 1.7256 Prob>chi2 = 0.631检验统计量 F＝26.09，p<0.0001。按＝0.05 水平，拒绝 H0，接受 H1，可认为不同剂量的茶多酚保健饮料对延长小白鼠的平均耐缺氧存活时间有影响。例 8-2 某讨论者为了了解...
