Changes to the Data Generating Process

[SAShole]

Hi SAS Friends,

I apologize for the slightly out of place question but I figured the great resources here could help

My issue is that I have time-series data that trends nicely expect for this last quarter where the data generating process was changed. now some of the estimates don't trend. are there any statistical techniques i can apply to smooth out the data? i only have this last data point using the new data-generating process.

Thanks for your help,

also if you'd like to recommend a statistical/econometric forum where you think this question would be better served i'm all ears.

[SteveDenham]

With only a single point, I don't see how you can do much of anything.  With a couple of points, a Kalman filter might help, but it would still be greatly influenced by the historical values.

Can you apply the new data generating process to old source data in any way, such that you could detect a level change or a multiplier?

Not much help, I'm afraid.

Steve Denham