Stepwise selection

Summary of stepwise elimination

Step	Variables entered	Number of variables	R-square	Model C(p)	F-value	Pr>F
1	X1	1	0.4202	1.7060	13.78	0.0015

By stepwise selection, only X₁ is remained since the p-value is 0.0015 which is smaller than 0.05.

Conclusion:

The best model is