** Instruction of risc.c

0. NOTE

Little error handling is implemented in the program. Thus it may
cause erroneous results; please use the program wisely. You may
freely modify or rewrite the program so that you can accomplish your purpose. 

The program does not converge in some situations, where
you may obtain its convergence by modifying starting values
of the iterative procedures.

1. How to compile?

gcc -o risc risc.c -lm

2. How to use?

./risc population_size cell_total < size_index_filename,

where "population_size" implies the corresponding population size of
samples whose size indices are provided. "cell_total" implies
the total number of cells of the population. "size_index_filename"
implies the name of the file that describes the information
of size indices.

For example,

./risc 35850000 1898496000 < kento1.f

results in Hoshino (2001)'s Case 1.

3. How to describe size index information?

Just write s_i in the i-th line of a file. See example files
(from kento1.f to kento7.f) that are provided in this site.
The last line of such a file is supposed to describe the
number of the largest cells; namely, the last line should be other than 0.

4. Referece

Hoshino, N. (2001) Applying Pitman's sampling formula to
microdata disclosure risk assessment. Journal of Official
Statistics, 17, 499-520.

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Nobuaki Hoshino