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1、建立检验假设,确定检验标准:H0:1=2=3=4,即4组肿瘤重量相同H1:1,2,3,4,即4组肿瘤重量不同或不全相同=0.052、选择检验方法,计算检验统计量F值:C=(ginjijx1i1)2/N=40/5.922=213.91SS总=2g1ini1jijx-x)(g112inijijCx239.49-213.91=25.58SS组间=Cnxxxngiinijijgiii12112)()((3622229.172.194.19)/10-213.91=22.23SS组内=SS总-SS组间=25.58-22.23=3.35总N-1=40-1=39,组间=4-1=3,组内=N-g=40-4=36MS组间=SS组间/组间=22.23/3=7.412,MS组内=SS组内/组内=3.35/36=0.093F=MS组间/MS组内=7.412/0.093=79.6713、确定p值,判断结果:以组间自由度和组内自由度查F界值表得F)36.3(01.0=4.3879.671,故p0.05,因此按=0.05水准拒绝H0,接受H1,可认为4组肿瘤的重量不同描述肿瘤重量(g)N均值标准差标准误均值的95%置信区间极小值极大值下限上限对照组103.600.4422.13983.2843.9163.04.5低剂量组101.940.2413.07631.7672.1131.62.4中剂量组101.920.2044.06461.7742.0661.62.2高剂量组101.790.2767.08751.5921.9881.42.3总数402.313.8099.12812.0532.5721.44.5单因素方差分析肿瘤重量(g)平方和df均方F显著性组间22.23537.41279.671.000组内3.34936.093总数25.58439多重比较因变量:肿瘤重量(g)(I)组别(J)组别均值差(I-J)标准误显著性95%置信区间下限上限LSD对照组低剂量组1.6600*.1364.0001.3831.937中剂量组1.6800*.1364.0001.4031.957高剂量组1.8100*.1364.0001.5332.087低剂量组对照组-1.6600*.1364.000-1.937-1.383中剂量组.0200.1364.884-.257.297高剂量组.1500.1364.279-.127.427中剂量组对照组-1.6800*.1364.000-1.957-1.403低剂量组-.0200.1364.884-.297.257高剂量组.1300.1364.347-.147.407高剂量组对照组-1.8100*.1364.000-2.087-1.533低剂量组-.1500.1364.279-.427.127中剂量组-.1300.1364.347-.407.147*.均值差的显著性水平为0.05。肿瘤重量(g)组别Nalpha=0.05的子集12Student-Newman-Keulsa高剂量组101.790中剂量组101.920低剂量组101.940对照组103.600显著性.5201.000将显示同类子集中的组均值。a.将使用调和均值样本大小=10.000。
本文标题:方差分析及统计图标
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