Marker heatmap
The Spearman correlation coefficient is calculated for each pairwise combination of markers. The result is displayed as a heatmap - a grid of coloured squares. The colour of a square indicates the correlation value between a pair of markers on a blue-grey-orange scale (representing negative correlation, no correlation and positive correlation respectively). A dendrogram, or tree, shows how markers group together using agglomerative hierarchical clustering with complete linkage.
Available for: continuous and categorical scoring
[Top]Viewing the results
Figure 1: A marker heatmap showing protein marker correlations. The dendrograms (left and top) show how markers group together based on hierarchical clustering.
The plot on the left hand side contains a heatmap illustrating Spearman correlation values and dendrograms, which visualise hierarchical clustering based on these values. Each square on the heatmap represents a Spearman correlation value between a pair of markers. Marker names are displayed on the right and bottom of the heatmap. If the labels are not clear or are too small, please click on the button labelled Download as SVG image to download a copy of the image that can be zoomed without loss of quality.
The buttons on the right-hand side are:
- Open in new window - Open the current plot in a new window. Useful for comparing multiple plots side-by-side.
- Download as SVG image - Download the current image in scalable vector graphic (SVG) format. SVG images can be rescaled to any size without loss of quality, ideal for posters and publications.
- Download correlations (.tsv) - Download the matrix of Spearman correlation values used to generate the heatmap, in tab-separated value format.
The heatmap colour scale (below) shows Spearman correlation on a continuous scale - blue (negative) through grey (no correlation) through orange (positive).
