When a simple Correspondence Analysis is performed, the report lists the singular values of the following equation:
where:
• P is the matrix of counts divided by the total frequency
• r and c are the row and column sums of P
• the D matrices are diagonal matrices of the values of r and c
When Multiple Correspondence Analysis is performed, the singular value decomposition extends to the following equation:
where:
• C is the Burt table.
• Q is the number of categorical variables
• n is the number of observations
• 1 is a column vector of ones