How to write the code to fit the AR model

How to write the code to fit the AR model, I believe many inexperienced people don't know what to do about it. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

DATA SILVER

TITLE 'MONTH END STOCKS OF SILVER'

INPUT SILVER @ @

Thornton N _

RETAIN DATE '01DEC76'D LSILVER1-LSILVER4

DATE=INTNX ('MONTH',DATE,1)

FORMAT DATE MONYY.

OUTPUT

LSILVER4=LSILVER3

LSILVER3=LSILVER2

LSILVER2=LSILVER1

LSILVER1=SILVER

CARDS

846 827 799 768 719 652 580 546 500 493 530 548 565

572 632 645 674 693 706 661 648 604 647 684 700 723

741 734 708 728 737 729 678 651 627 582 521 519 496

501 555 541 485 476 515 606 694 788 761 794 836 846

RUN

PROC PRINT DATA=SILVER

RUN

PROC REG DATA=SILVER

MODEL SILVER=LSILVER1 LSILVER2

LSILVER3 LSILVER4 / SS1

RUN

PROC REG DATA=SILVER

MODEL SILVER=LSILVER1 LSILVER2

RUN

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