Similarity Matrix

A Similarity Matrix shows how similar two variables are along a scale. They are often used in genetic visualizations. The matrix often is a square made up of a series of smaller squares, with the color of the square indicating the level of similarity between the data points. The diagram shown above is a differential expression signature similarity matrix from a study on gene expression profiling of long-lived dwarf mice that compares longevity-associated genes and relationships with diet, gender and aging. Dark red colors indicate high similarity, pairs with non-significant similarity have no coloring.