我正在使用汽车包运行重复测量ANOVA。哪个工作正常并返回类似于此的输出:
Univariate Type III Repeated-Measures ANOVA Assuming Sphericity
SS num Df Error SS den Df F Pr(>F)
(Intercept) 7260.0 1 603.33 15 180.4972 9.100e-10 ***
phase 167.5 2 169.17 30 14.8522 3.286e-05 ***
hour 106.3 4 73.71 60 21.6309 4.360e-11 ***
phase:hour 11.1 8 122.92 120 1.3525 0.2245
---
Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
Mauchly Tests for Sphericity
Test statistic p-value
phase 0.70470 0.086304
hour 0.11516 0.000718
phase:hour 0.01139 0.027376
Greenhouse-Geisser and Huynh-Feldt Corrections
for Departure from Sphericity
GG eps Pr(>F[GG])
phase 0.77202 0.0001891 ***
hour 0.49842 1.578e-06 ***
phase:hour 0.51297 0.2602357
---
Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
现在它告诉我,在某些情况下,必须对球形度进行校正。据我所知,这种修正不仅会影响p值,还会影响自由度(df)。但是输出没有显示出来。那么如何显示调整后的df?
答案 0 :(得分:1)
也许您已经解决了这个问题,但是要在Greenhouse-Geisser或Huynh-Feldt校正的情况下校正自由度,只需将每个自由度乘以相应的epsilon值即可。这是一个基于您的结果的示例:
# degrees of freedom for phase:hour
num_Df <- 8
den_Df <- 120
# Greenhouse-Geisser epsilon
gg_e <- 0.51297
# adjusted degrees of freedom
num_Df_adj <- gg_e * num_Df
den_Df_adj <- gg_e * den_Df