Indicator matrix generation from survey questions.

indicator matrix, multiple correspondence analysis, crosstabulation analysis, categorical analysis.

An indicator matrix (G), a binary coding matrix of the factors called dummy variables. The number of rows are the total sample items and the columns are the total categories of the variables. The elements in G are 1's if the item corresponding to the category of the variable or 0's if not. The indicator matrix is an alternative format to input data in a Multiple Correspondence Analysis from survey questions. One can get the Burt matrix (B) simply by B = G'G.

Syntax: function x=indmatgen(lcv,table)

Input:
lcv: maximum number of levels on each catagorical variable
table: table of data

Output:
- Indicator matrix