# What is similarity?

• (noun): The quality of being similar.

## Similarity

Different fields provide differing definitions of similarity:

### Some articles on similarity:

Sim Rank - Introduction
... Many applications require a measure of "similarity" between objects ... More generally, a similarity measure can be used to cluster objects, such as for collaborative filtering in a recommender system, in which “similar” users and items are grouped based on the users ... Various aspects of objects can be used to determine similarity, usually depending on the domain and the appropriate definition of similarity for that domain ...
Similarity - In Other Fields
... In psychology, similarity (psychology) In music, musical similarity In chemistry, chemical similarity ...
Self-similarity Matrix
... In data analysis, the self-similarity matrix is a graphical representation of similar sequences in a data series ... Similarity can be explained by different measures, like spatial distance (distance matrix), correlation, or comparison of local histograms or spectral ... A similarity plot can be the starting point for dot plots or recurrence plots ...
Sim Rank - Basic SimRank Equation
... Let us denote the similarity between objects and by ... Since there is no way to infer any similarity between and in this case, similarity is set to, so the summation in the above equation is defined to be when or ...
Self-similarity Matrix - Definition
... To construct a self-similarity matrix, one first transforms a data series into a an ordered sequences of feature vectors, where each vector describes the relevant ... Then the self-similarity matrix is formed by computing the similarity of pairs of feature vectors where is a function measuring the similarity of the two vectors, for instance, the ... Then similar segments of feature vectors will show up as path of high similarity along diagonals of the matrix ...

### More definitions of "similarity":

• (noun): A Getalt principle of organization holding that (other things being equal) parts of a stimulus field that are similar to each other tend to be perceived as belonging together as a unit.
Synonyms: law of similarity

### Famous quotes containing the word similarity:

Incompatibility. In matrimony a similarity of tastes, particularly the taste for domination.
Ambrose Bierce (1842–1914)