x = [ 6.661 6.661 6.667 6.667 6.664 6.683 6.681 6.676 6.678 6.679...
6.672 6.678 6.671 6.675 6.672 6.674 ];
group = [ 1 1 1 1 1 2 2 2 2 2 2 3 3 3 3 3 ];
y = ( x - 6.660 ) * 1000;
p = anova1 ( y , group )