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[求助]
SMATR做标准化主轴分析(SMA) 已有5人参与
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刚开始接触学习标准化主轴分析(Standardized major axis regression, SMA)，遇到一些问题想请教大家： 1）SMA分析出来的斜率slope与excel中的斜率是否一致？我的数据计算出来是不一致的，但是我觉得理论上应该是一致的，不知道是不是我理解的不到位，在使用SMATR软件过程中出现错误？ 2）两组或多组数据是否有共同斜率的P值判断。在"TEST FOR COMMON SLOPE ACROSS GROUPS" 这一栏里有个P值，在其后紧接着又有一个“Test statistic” 中也有一个P值，那么共同斜率的P值是看哪一个呢？后一个P值的意义是什么呢？ 十分感谢大家能在百忙之中抽出时间来帮我解决问题。谢谢。 结果如下，请大家帮我分析一下，这两组数据是否有共同斜率(common slope)？谢谢。 SMA analysis Filename: inputnp.txt Grp: Group Y: log P X: log N No. iterations: 1000 Critical p: 0.050 Conf.interval: 95% Filters: Filtered or empty data points: 16 Groups with less than 2 data points (removed): No. groups: 2 No. datapoints: 251 Measurement Error: Not included SMA results Group n R2 p Slope LowCI UppCI Interc LowCI UppCI Ymean Xmean H0_b F p 1 133 0.567 0.000 1.431 1.278 1.603 -1.729 -1.937 -1.522 0.085 1.268 1.000 40.580 0.000 2 118 0.136 0.000 1.426 1.203 1.690 -1.801 -2.083 -1.519 -0.164 1.149 1.000 17.622 0.000 TEST FOR COMMON SLOPE ACROSS GROUPS Grps N Slope LowCI UppCI H0_b X2 p 2 251 1.430 1.301 1.571 1.000 51.549 0.000 Test statistic: 0.001 p = 0.962 COMPARISON OF LINES WITH COMMON SLOPE Common slope: 1.430 Grand mean X: 1.212 Grand mean Y: -0.032 Grand mean F: -1.764 Grand mean R: -1.764 Group n R2 Interc YgrandX XgrandY Ymean Xmean Fmean Rmean 1 133 0.567 -1.727 0.005 1.186 0.085 1.268 1.897 -1.727 2 118 0.136 -1.806 -0.073 1.241 -0.164 1.149 1.478 -1.806 Testing for shifts in elevation between groups using WALD statistic df stat p A_com 1 11.788 0.001 na Significant elevation shift between groups! No post-hoc multiple comparisons Testing for shifts along the common slope using WALD statistic df stat p A_com 1 99.678 0.000 na Significant shift along common slope! No post-hoc multiple comparisons |
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