/*-------------------<-- Start of Description -->--------------------\

| Generate random variate from a T distribution                      |

|--------------------<!-- End of Description -->---------------------|

|--------------------------------------------------------------------|

|--------------<!-- Start of Files or Arguments Needed -->-----------|

| Arguments Need:                                                    |

|      seed - seed; Required, default is the current system time;    |

|      var  - the variable to save the generated random variates;    |

|      df   - the degree of freedom;                                 |

|      mean - the mean of the normal distribution;                   |

|      std  - the std of the distribution;                           |

|      temp - temporary seed variable;                               |

|---------------<!-- End of Files or Arguments Needed -->------------|

|--------------------------------------------------------------------|

|----------------<!-- Start of Example and Usage -->-----------------|

|Example                                                             |

|   data one;                                                        |

|      do i=1 to 20;                                                 |

|      x=%_rant(seed=1, df=3);                                       |

|      z=%_rant(seed=1, mean=10, std=5, df=3);                       |

|      %_rant(seed=12345,var=y, mean=10, std=1, df=3);               |

|      output;                                                       |

|      end;                                                          |

|   run; %print(one);                                                |

|Usage: _rant(seed=%sysfunc(datetime(), 15.), df=REQUIRED, var=,     |

|             mean=, std=);                                          |

\-------------------<!-- End of Example and Usage -->---------------*/

%macro _rant(seed=%sysfunc(datetime(), 15.), df=REQUIRED, var=, mean=,

             std=, temp=_rant0_);

/*--------------------------------------------\

| Copy Right: Duo Zhou;                       |

| Created: 3-22-2002 6:30pm;                  |

| Purpose: Random T Generator;                |

\--------------------------------------------*/

%let _dfchk_=%sysfunc(rxmatch(%sysfunc(rxparse($a|$A|$w)),&df));

%if (%quote(&seed) eq) or &_dfchk_ %then %do;

   %if (%quote(&seed) eq) %then %do;

      %put ==> Error: This is not a valid seed!;

      %if (%length(&var)) %then %do; &var=.; %end;

      %else %do; .;%end;

   %end;

   %if &_dfchk_ %then %do;

      %put ==> Error: &df is not a valid degree of freedom!;

      %if (%length(&var)) %then %do; &var=.; %end;

      %else %do; .;%end;

   %end;

   %goto finish;

%end;

%else %do;

   %if (%length(&var)) %then %do;

      %if (not %sysfunc(rxmatch(%sysfunc(rxparse(_|.|$a|$A|$w)),&seed))) %then %do;

         drop &temp;

         retain &temp &seed;

         %let seed=&temp;

      %end;

      call ranuni(&seed, &var);

      &var=tinv(&var, &df);

   %end;

   %else tinv(ranuni(&seed), &df);

   %if (%length(&std))  %then *&std;

   %if (%length(&mean)) %then +&mean;

%end;

%finish:

%mend _rant;

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