Note the inverse linear correlation between dish size and frequency. Canonical factor analysis seeks factors which have the highest canonical correlation with the observed variables. This is indicative of the positive correlation between behavioral inhibition and selective mutism. He based his study on statistical correlation. A correlation and structural equation model analysis was conducted. The statistical significance of this correlation was 99.99%. Galton, a statistician, introduced correlation and regression analysis and discovered regression toward the mean. Several authors have offered guidelines for the interpretation of a correlation coefficient. Beta specifically gives the volatility ratio multiplied by the correlation of the plotted data. Distribution-based clustering produces complex models for clusters that can capture correlation and dependence between attributes. These studies were widely criticized as showing correlation, not causality. Other methods use normalized cross correlation (NCC). This causes a positive currency correlation between XXXYYY and XXXZZZ. There is also the question of the validity of the method of correlation. It also had a moderate negative correlation with harm avoidance.