/*
** Lesson 5.1: Condition Number and Correlation Matrix
*/
use gpe2;
output file = gpe\output5.1 reset;
load data[17,7] = gpe\longley.txt;
data = data[2:17,.];

year = data[.,1];
pgnp = data[.,2];
gnp = data[.,3];
af = data[.,5];
em = data[.,7];

call reset;
_corr = 1;  @ cond# and correlation matrix @
_names = {"em","year","pgnp","gnp","af"};
call estimate(em,year~pgnp~gnp~af);
end;