asa144

asa144, a MATLAB code which randomly generates an RxC contingency table, by James Boyett.

This is a version of Applied Statistics Algorithm 144.

The algorithm accepts a table shape (the number of rows and columns), and two vectors, the lists of row and column sums. There may be 0, 1, or many tables with nonnegative, integral entries that have the given shape and sums. The program will generate, at random, one of the tables and return it. Repeated calls to the program will return new random selections.

For example, suppose M = 2, N = 3, row sum = (/ 6, 5 /) and column sum = (/ 3, 4, 4 /), then here are two tables that satisfy the constraints:

        1  2  3
        2  2  1
      

        3  0  3
        0  4  1
      

Licensing:

The computer code and data files described and made available on this web page are distributed under the MIT license

Languages:

asa144 is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

asa144_test

asa159, a MATLAB code which randomly generates an RxC contingency table.

subset, a MATLAB code which includes a routine called IMAT_01_ROWCOLSUM() which generates a (0,1) matrix with given row and column sums.

Author:

Original FORTRAN77 version by James Boyett; MATLAB version by John Burkardt.

Reference:

1. James Boyett,
   Algorithm AS 144: Random R x C Tables with Given Row and Column Totals,
   Applied Statistics,
   Volume 28, Number 3, 1979, pages 329-332.

Source Code:

• i4mat_print.m prints an integer matrix.
• i4mat_print_some.m prints some of an integer matrix.
• i4vec_print.m prints an integer vector.
• r8_uniform_01.m returns a unit double precision pseudorandom number.
• rcont.m generates a random two-way table with given marginal totals.
• s_len_trim.m returns the length of a string to the last nonblank.