options ls=72 ps=50;
data arima;input t x y;
x1=dif(x);y1=dif(y);
cards;
                         1    108.377    106.415
                         2    110.823    106.972
                         3    113.964    108.935
                         4    116.134    110.576
                         5    119.565    111.196
                         6    122.050    111.065
                         7    123.751    113.136
                         8    125.643    113.416
                         9    128.457    114.757
                        10    130.071    114.819
                        11    131.685    117.026
                        12    133.828    118.144
                        13    135.770    119.107
                        14    138.502    119.792
                        15    140.825    122.468
                        16    144.173    122.074
                        17    147.591    124.914
                        18    149.641    122.471
                        19    152.275    126.401
                        20    155.434    125.789
                        21    157.352    127.960
                        22    160.852    127.094
                        23    164.692    129.393
                        24    169.367    131.400
                        25    173.796    131.925
                        26    177.584    131.996
                        27    179.534    133.563
                        28    180.687    133.188
                        29    180.365    133.410
                        30    180.209    136.611
                        31    177.917    136.652
                        32    177.130    137.308
                        33    176.063    139.098
                        34    175.594    138.667
                        35    175.831    141.188
                        36    176.569    143.312
                        37    177.178    143.851
                        38    176.153    143.349
                        39    176.368    145.479
                        40    176.861    146.053
                        41    178.001    145.198
                        42    179.204    147.253
                        43    181.523    147.642
                        44    183.492    149.644
                        45    186.408    150.171
                        46    189.361    150.979
                        47    191.226    154.276
                        48    191.927    154.378
                        49    191.410    153.612
                        50    190.127    155.565
                        51    189.356    155.494
                        52    191.509    155.153
                        53    194.482    159.418
                        54    198.870    159.103
                        55    200.991    159.605
                        56    201.980    161.858
                        57    202.588    163.555
                        58    203.738    163.133
                        59    204.037    163.813
                        60    203.971    165.099
                        61    204.233    165.756
                        62    205.146    166.266
                        63    206.590    168.721
                        64    208.199    168.784
                        65    210.815    170.185
                        66    213.223    171.790
                        67    215.111    170.919
                        68    217.959    171.843
                        69    221.914    172.919
                        70    226.284    174.903
                        71    229.555    175.518
                        72    232.527    176.331
                        73    233.870    175.443
                        74    234.579    176.312
                        75    235.410    177.676
                        76    237.470    180.410
                        77    239.555    182.109
                        78    242.617    182.461
                        79    245.283    181.727
                        80    247.481    185.294
                        81    247.774    185.397
                        82    247.944    184.576
                        83    247.392    188.606
                        84    247.011    186.442
                        85    248.064    186.860
                        86    248.154    189.173
                        87    248.929    189.841
                        88    248.741    190.755
                        89    250.057    193.146
                        90    250.023    192.801
                        91    251.518    194.451
                        92    251.733    194.274
                        93    252.369    197.181
                        94    252.894    196.462
                        95    252.227    200.087
                        96    253.721    199.964
                        97    253.556    199.187
                        98    254.269    199.752
                        99    255.058    199.834
                       100    256.168    203.643
;
proc plot;plot x*t;run;
proc plot;plot x1*t;run;
proc plot;plot y*t;run;
proc plot;plot y1*t;run;
proc arima data=arima;
identify var=x;
identify var=x1;
estimate p=1 method=ml;
forecast out=a1 back=0 lead=10 id=t;run;
proc plot data=a1(firstobs=90);
plot x1*t='*' forecast*t='f' l95*t='l' u95*t='u'/overlay;run;

proc arima data=arima;
identify var=y;
identify var=y1;
estimate q=1 method=ml;
forecast out=a2 back=0 lead=10 id=t;run;
proc plot data=a2(firstobs=90);
plot y1*t='*' forecast*t='f' l95*t='l' u95*t='u'/overlay;run;