data Toothpaste;
input y x;
cards;
3.63	0.97
4.2	0.95
3.33	0.99
4.54	0.91
2.89	0.98
4.87	0.9
4.9	0.89
5.29	0.86
6.18	0.85
7.2	0.82
7.25	0.79
6.09	0.83
6.8	0.81
8.65	0.77
8.43	0.76
8.29	0.8
7.18	0.83
7.9	0.79
8.45	0.76
8.23	0.78
proc autoreg ;
model y = x / nlag=1 method=ml;
run;