I was given a list of parameter estimates from my boss. She wants to predict the 
dependent variable "fsshen" beyond jan 2011, the last observation, through 
December 2011, giving the prediction intervals (90%). I don't know if I have the 
complete information to do this. So my question(s) is can R determine a 
prediction interval from this data with just these parameter estimates. And if 
so, how?

Thanks all who can help.

Zeda.

Here are the parameter estimates:
Jan dummy 108.422
Feb dummy 107.619
Mrc dummy 80.515 
Apr dummy 95.307
May dummy 92.340 
Jun dummy 99.866
Jul dummy 83.276
Aug dummy 78.763
Sep dummy 83.717 
Oct dummy 103.963 
Nov dummy 63.060
Dec dummy 27.147
coeff. on "SalesLag11" 0.423
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