Different patterns of correlation Positive egadi Null 0<r<1 -1<r<0 Completely Completely Positive Negative ●。●···●·●·●16 r＝1 r＝-1 r=0 r=0 Completely Positive Completely Negative Null Null 0<r<1 -1<r<0 r=0 r=0 Positive Negative Null Null Different Patterns of Correlation