Interim estimates of the effectiveness of the influenza vaccine against A(H3N2) influenza in adults in South Korea, 2016–2017 season
Fig 3
Correlation plot among 34 amino acid substitutions found in A(H3N2) influenza viruses within 3C.2a clade.
Pearson’s correlation was calculated using R packages. Correlation coefficients were presented according to the value on the plot. The shapes and colors indicate the direction and strength of correlation. Blue color indicates a positive correlation, whereas red color represents negative correlation. The closer the shape of the ellipse shows linear mark, the closer the correlation value indicates to +1 or -1.