topic Re: Combinations and Permutations in SAS/IML Software and Matrix Computations

Combinations and Permutations

SBuc — Wed, 19 Jul 2017 15:51:52 GMT

Dear community,

I am looking for printing all the different combinations of a clinical signs scoring system.

I have six clinical signs (b1,..,b6) which are either normal abnormal (0,1)

I want to print all the 2^6 (64) possible clinical signs association.

I am relatively new with IML of SAS and did not arrive to do it.

please let me know if you have any clue!

I really appreciate

Re: Combinations and Permutations

Rick_SAS — Wed, 19 Jul 2017 16:58:24 GMT

The simplest way is

proc iml;
allComb = ExpandGrid(0:1, 0:1, 0:1,
                     0:1, 0:1, 0:1 ); 
print allComb;

This solution hard-codes six arguments, If the 'number of clinical signs' might change from study to study, you can use one of the other techniques in the article "Creating a matrix with all combinations of zeros and ones."

Re: Combinations and Permutations

SBuc — Wed, 19 Jul 2017 20:06:24 GMT

Thank you so much!

you solved my problem!

Re: Combinations and Permutations

WarrenKuhfeld — Wed, 19 Jul 2017 23:59:02 GMT

Since you are asking for a full-factorial design, you can instead use the MktEx macro. It also makes fractional factorial designs, orthogonal arrays, and nonorthogonal designs, all using the same syntax. You can add the option 'noqc' after 'render' if you do not have the SAS/QC product. For your particular problem, you could also use PROC PLAN.

%mktex(2 ** 6, n=64, levels=0, options=render)