//
//Collaborative Filtering analysis command
//Cmmand name is grouplens which infer unkown score by correlation.  
//
//Quation
//This command needs data which is consited of 3 colomns as user item score.
//

//Syntax
grouplens score by user item;

//
//Options
//
method=sum  //score is used by sum of score;
method=ave  //(defalut) score is used by score average.
method=no   //score is used count.
method=bool //score is used exist or no exist.

//
//Example
// 
//Read score reference table which is consist of user and item.
//But this table includes unkown score (?).
//This command infers unkown score by collaborative filter.
//
get grpout.csv@



//
//Make score list by user and item widhout unkown score. 
//
untable item_1-6 by user;
get freq@ana;

//untable command is as same as following program.
vector item[6];

for(i=1;i<=6;i++) {
  if(item[i] == ?) {
  }
  else {
    items=i;
    score=item[i];
    outrec;
  }
}
select user items score;




//
//Unkown score is infered by this command as score_calc.
//
grouplens score by user items;
get freq@ana;



//
//At last make score reference table from output.
//

table score_calc by items user;
get freq@ana;