求助，关于ARIMA的预测

我有两组数据需要预测，但刚开始用matlab不懂怎么用arima?

k_f_t=

6.711481

5.621407

5.143087

4.202553

2.532845

2.298743

3.223271

1.220877

-0.69207

-2.5239

-3.96366

-4.60024

-6.53365

-5.95975

-6.68099

k_m_t=

5.372847

4.666288

2.440698

3.044535

2.143023

2.208374

1.109384

0.086454

0.643833

-2.72733

-3.27211

-1.94748

-5.40489

-4.33163

-4.032

哪位大神能告诉我该怎么用吗？应该怎么用？还有，arima(1,1,0), arima(0,1,0),arima(0,1,1)哪个预测更好？
谢啦