sas, factorial analysis

1. how to do factorial analysis in SAS

2. fractional factorial design for conjoint analysis using SAS QC

3. Problem with macro: FACTORIAL

I'm trying to write this small macro:

calculate N! Example if N=4  we will have 1*2*3*4=24 =4!

The following macro very well when N is not zero, but when N=0 It doesn't
work.
Can someone help.
Thanks a lot.

%macro FACT(N=);
%*--------------------------------------------------------;
%* Return N! Example if N=4  we will have 1*2*3*4=24 =4!  ;
%*--------------------------------------------------------;
data fac;
 FACT=1;
   %If &N=0 %then   FACT=1;
   %do I=1 %to &N;
      FACT =FACT*&I;
       %end;
proc print label;
 var FACT;
 run;

%mend FACT;

%FACT(N=4);
%FACT(N=0);

4. RE : Problem with macro: FACTORIAL

5. a very crude macro on calculating factorial..

Hello all,

 I am trying to write a macro that takes in a number and calcualtes the
 factorial from 1 to n in the ascending order. I have written it and it
 is executing properly but i need suggestions to achieve it in lesser
 number of steps. I am a beginner in SAS and so not very good in
 building proper logic into the code.can number of loops be reduced?

any suggestions would be of great help .

Thanks

Rao.



/*-------Macro to calculate the factorial from 1 to n in the ascending
order-----*/

dm log 'clear';
dm output 'clear';
%macro factorial(n); /*---parameter to the macro----*/
data dd;
 do i = &n to 1 by -1;
  j = 1;
  m = i;
  k = 1;
  do until (m<=1);
  j = j * m;
  k = m - 1;
  m = k;
  end;
  output;
  end;
  drop m k ;
  run;
  proc sort;
  by i;
  run;
  proc print noobs label;
  label i = 'Integer'
        j = 'factorial';
  run;
  %mend factorial;

6. Creating Fractional Factorial Design

7. How do I generate a Resolution V Fractional Factorial Design

8. 3 factorial Desgin