>  x.arma <- arma(x, order = c(1,1),include.intercept =FALSE)
>  summary(x.arma)

Call:
arma(x = x, order = c(1, 1), include.intercept = FALSE)

Model:
ARMA(1,1)

Residuals:
    Min      1Q  Median      3Q     Max
-6433.8   318.1   617.0   979.1  2545.3

Coefficient(s):
     Estimate  Std. Error  t value Pr(>|t|)   
ar1   0.86543     0.07189   12.039   <2e-16 ***
ma1  -0.07997     0.15293   -0.523    0.601   
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Fit:
sigma^2 estimated as 2531358,  Conditional Sum-of-Squares = 188404299,  AIC = 1287.5
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目前数据如以上
请问 ma这时怎么筛选呢？
输入什么？