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Heat map


A heat map is a graphical representation of data where the values taken by a variable in a two-dimensional map are represented as colours. A very similar presentation form is a Tree map.

Heat maps are typically used in Molecular Biology to represent the level of expression of many genes across a number of comparable samples (e.g. cells in different states, samples from different patients) as they are obtained from DNA microarrays.

Heat maps are also used in places where the data is volatile and representation of this data as a heat map improves usablity. For example, NASDAQ uses heat maps to show the NASDAQ-100 index volatility. There are also heat maps for showing the housing price in various regions.


Eisen, M.B., Spellman, P.T., Brown, P.O. & Botstein, D. (1998). "Cluster analysis and display of genome-wide expression patterns". Proc. Natl. Acad. Sci. USA 95 (25): 14863–14868. PMID 9843981 doi:10.1073/pnas.95.25.14863

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Heat_map". A list of authors is available in Wikipedia.
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