Fig. 2
From: Test-retest reliability of brain arousal regulation as assessed with VIGALL 2.0
Scatter plot of lability score at T1 vs. T2 (N = 27). The horizontal axis illustrated the lability score in T1 while the vertical axis represented the lability score in T2. Double circles indicate two subjects with the same lability score. Note that nonparametric correlations were calculated due to the ordinal level of the lability score. The linear regression line is presented only for illustration purpose