Hello!

I am trying to use ARIMA models with 616 observations. However, the output kept indicating the problem of insufficient observations. Would you please tell me what's the problem? Any help would be appreciated.

. describe nfinj

storage display value
variable name type format label variable label
------------------------------------------------------------------------------------------------
nfinj byte %10.0g

. sum nfinj

Variable | Obs Mean Std. Dev. Min Max
-------------+---------------------------------------------------------
nfinj | 616 3.37013 2.220968 0 13

. arima nfinj, arima(2,0,2)
(note: insufficient memory or observations to estimate usual
starting values [2])
insufficient observations
r(2000);

.