By Michael Greenacre

ISBN-10: 1315352958

ISBN-13: 9781315352954

ISBN-10: 1498731775

ISBN-13: 9781498731775

ISBN-10: 1498731783

ISBN-13: 9781498731782

Drawing at the author’s forty five years of expertise in multivariate research, **Correspondence research in perform, 3rd variation, **shows how the flexible approach to correspondence research (CA) can be utilized for information visualization in a large choice of events. CA and its versions, subset CA, a number of CA and joint CA, translate two-way and multi-way tables into extra readable graphical kinds ― perfect for functions within the social, environmental and overall healthiness sciences, in addition to advertising and marketing, economics, linguistics, archaeology, and more.

**Michael Greenacre **is Professor of facts on the Universitat Pompeu Fabra, Barcelona, Spain, the place he teaches a direction, among others, on info Visualization. He has authored and co-edited 9 books and eighty magazine articles and ebook chapters, totally on correspondence research, the newest being *Visualization and Verbalization of Data* in 2015. He has given brief classes in fifteen nations to environmental scientists, sociologists, info scientists and advertising and marketing pros, and has really expert in records in ecology and social science.

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**Extra info for Correspondence Analysis in Practice, Third Edition**

**Example text**

E4 E3 • ◦ average • E2 • E1 ... ... ... ... ... ... ... ... ... ... ... 4: The “stretched” profile space showing the χ2 -distances from the profiles to their centroid; the inertia is the weighted average of the sum of squares of these distances, and the χ2 statistic is the inertia multiplied by the sample size (n = 312 in this example). .. .. . . ........ ....... ....... ....... ....... ....... ....... ....... ....... ....... .......

3. e. the grand total of the table) to give the average row profile and average column profile. 4. Comparing row profiles to their average leads to the same conclusions as comparing column profiles to their average. 5. Profiles consisting of m elements can be plotted as points in an m -dimensional space. Because their m elements add up to 1, these profile points occupy a restricted region of this space, an (m –1)-dimensional subspace known as a simplex. This simplex is enclosed within the edges joining all pairs of the m unit vectors on the m perpendicular axes.

5 Plotting Chi-Square Distances In Chapter 3 we interpreted the positions of two-dimensional profile points in a triangular coordinate system where distances were Euclidean distances. In Chapter 4 the chi-square distance (χ2 -distance) between profile points was defined, as well as its connection with the chi-square statistic and the inertia of a data matrix. The χ2 -distance is a weighted Euclidean distance, where each squared term corresponding to a coordinate is weighted inversely by the average profile value corresponding to that coordinate.

### Correspondence Analysis in Practice, Third Edition by Michael Greenacre

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