Figure 3. Variable selection by LASSO. (A) Hierarchical clustering shows the correlation matrix heatmap of 43 DE-miRNAs from the differential expression analysis. (B) Hierarchical clustering shows the correlation matrix heatmap of 6 DE-miRNAs which consisted of the classifier from LASSO regression analysis. Each cell represents the Pearson correlation between the row and column corresponding miRNAs. The legend shows the color change along with the change of correlation coefficient from 0.0 to 1.0.