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corran 1.0
File ID: 84638

corran 1.0
Download corran 1.0http://www.mathworks.comReport Error Link
License: Shareware
File Size: 10.0 KB
Downloads: 11
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corran 1.0 Description
Description: Correspondence Analysis (CA) is a special case of Canonical Correlation Analysis (CCA), where one set of entries (categories rather than variables) is related to another set. Also, it can be seen as a special case of Principal Component Analysis (PCA), where it is used for tables consisting of continuous measurement, whereas CA is applied to contingence tables.

CA starts with tabular data, usually two-way cross-classification, though the technique is generalizable to n-way tables with more than two variables. The variables must be discrete: nominal, ordinal or continuous segmented into ranges. Signifiance test is no supported. For model comparision and selection of a best-fit model should be done using another compatible method such as log-lineal or logistic regression. So, it is an exploratory analysis not a confirmatory one. Use chi-square distances that measure the profiles of a set of points between row and columns.

The data in a contingency table can be used to check for association of two categorical variables as a test of independence by an approximately (asymptotically) distributed chi-square random variable with (a-1)(b-1) degrees of freedom (a and b = categories of variable 1 and 2, respectively). The overall association is quantified by the chi-squared statistic divided by the grand total, called the total inertia. If there is independence, we would expect the rows or columns of the contingency table to have similar profiles. The chi-square can be expressed in vector and matrix terms as the nonzero eigenvalues, with rank k = min[(a-1),(b-1)], clearly less than min(a,b).

X - Data matrix=contingence table. Size a-categorical variable 1 x
b-categorical variable 2.

Complete Correspondence Analysis
Pair-wise Dimensions Plots. For the vertical and horizonal lines we use the hline.m and vline.m files kindly published on FEX by Brandon Kuczenski

License: Shareware

Related: divided, grand, Statistic, chisquared, quantified, Total, called, expect, similar

O/S:BSD, Linux, Solaris, Mac OS X

File Size: 10.0 KB

Downloads: 11

More Similar Code

Statistics fundamentals of the Correspondence Analysis (CA) is presented in the CORRAN and MCORRAN1 m-files you can find in this FEX author''s page. CA can be extended to more than two categorical variables, called Multiple Correspondence Analysis (MCA). CA and MCA are graphical techniques for representing the information in a two-way or higher-order multiway contingency table. They contain the counts (frequencies) of items for a...

Statistic fundamentals of he Correspondence Analysis (CA) is presented in the CORRAN m-file you can find in this FEX author''s page. CA can be extended, a this m-file makes, to more than two categorical variables, called Multiple Correspondence...

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