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In exploratory data analysis
In statistics, exploratory data analysis (EDA) is an approach of data analysis, analyzing data sets to summarize their main characteristics, often using statistical graphics and other data visualization methods. A statistical model can be used or ...
, the iconography of correlations, or ''representation of correlations'', is a data visualization
Data and information visualization (data viz/vis or info viz/vis) is the practice of designing and creating Graphics, graphic or visual Representation (arts), representations of a large amount of complex quantitative and qualitative data and i ...
technique which replaces a numeric correlation matrix
In statistics, correlation or dependence is any statistical relationship, whether causal or not, between two random variables or bivariate data. Although in the broadest sense, "correlation" may indicate any type of association, in statistics ...
by its graphical projection
Projection or projections may refer to:
Physics
* Projection (physics), the action/process of light, heat, or sound reflecting from a surface to another in a different direction
* The display of images by a projector
Optics, graphics, and carto ...
onto a diagram, on which the “remarkable” correlations are plotted as solid lines (positive correlations) or dotted lines (negative correlations); either shorter lengths, or thicker lines, or both, represent greater correlation projection components.
History
This idea is used in Gaussian graphic models for genome mapping, particularly. But the iconography of correlations is more general, since it does not assume that the data isGaussian
Carl Friedrich Gauss (1777–1855) is the eponym of all of the topics listed below.
There are over 100 topics all named after this German mathematician and scientist, all in the fields of mathematics, physics, and astronomy. The English eponymo ...
; it only relies on representing the correlation coefficient
A correlation coefficient is a numerical measure of some type of linear correlation, meaning a statistical relationship between two variables. The variables may be two columns of a given data set of observations, often called a sample, or two c ...
s geometrically.
The ''iconography of correlations'' first dates to 1975, applied to marine geochemistry in a 1981 thesis, and later in a 1982 data analysis
Data analysis is the process of inspecting, Data cleansing, cleansing, Data transformation, transforming, and Data modeling, modeling data with the goal of discovering useful information, informing conclusions, and supporting decision-making. Da ...
article. Afterward, the method was applied widely in the aerospace industry
Aerospace is a term used to collectively refer to the atmosphere and outer space. Aerospace activity is very diverse, with a multitude of commercial, industrial, and military applications. Aerospace engineering consists of aeronautics and astr ...
but for about fifteen years manufacturers kept it fairly confidential; generally, they preferred to not broadcast useful techniques to their competitors.
In 1997 the first company was incorporated to distribute iconography of correlations software. Since then the topic of iconography of correlations has been incorporated into some university courses, and typical topical articles' citation lists have rapidly and greatly expanded, particularly in the fields of medicine and mass spectrometry.
See also
*Bayesian network
A Bayesian network (also known as a Bayes network, Bayes net, belief network, or decision network) is a probabilistic graphical model that represents a set of variables and their conditional dependencies via a directed acyclic graph (DAG). Whi ...
— a graph in which cause and effect are measured probabilistically instead of geometrically as in correlation iconography.
References
External links
* * {{cite web , first=Marc , last=Girondot , date=17 January 2018 , title=Multivariable analysis and correlation of iconography , type=academic's blog , website=biostatsr.blogspot.com , place=Saclay, FR , quote=... about biostatistics ... by Professor Marc Girondot, University Paris Saclay. , url=https://biostatsr.blogspot.com/2018/01/multivariable-analysis-and-correlation.html — Brief introduction to correlation of iconography by a biostatistician
A statistician is a person who works with Theory, theoretical or applied statistics. The profession exists in both the private sector, private and public sectors.
It is common to combine statistical knowledge with expertise in other subjects, a ...
.
Data analysis