//
//Covariance anaysis command
//
//This command makes covariance matrix.

//Syntax
cov [variables];

//
//Example   
//Calurate correlation from covariance.
//
//Read subject points 
get school.csv@;




//Get correlation
corr x1 x2 y;




//Execute covariance.
cov x1 x2 y;





//Save covariance to tempolary file for outlook function as below.
get freq@ana;
put f_cov;

//
//Calcurate correlation from covaiance by outlook and line variable '#'.
//corr[i][j] = cov[i][j]/{sqrt(cov[i][i])*sqrt(cov[j][j])}; 
//
vector s[3];
s[1]=sqrt(outlook(f_cov,"#",#,"x1"));
s[2]=sqrt(outlook(f_cov,"#",#,"x2"));
s[3]=sqrt(outlook(f_cov,"#",#,"y"));

cr1=x1/(s[#]*s[1]);
cr2=x2/(s[#]*s[2]);
cr3=y /(s[#]*s[3]);




calcurated correlation are same with correlation by corr command.