Hi Roo,
I have found some info regarding the autoregressive modelling you are looking for. I'm not 100% that this is what you are looking for but check it out.
There is a toolkit for Labview called the Labview System Identification Toolkit. This has some of the functionality you might be looking for. Here is a link to it's page,
http://sine.ni.com/nips/cds/view/p/lang/en/nid/13853
There is also some basic info here,
http://zone.ni.com/devzone/conceptd.nsf/webmain/cdae45b04e72199586256f81008361cd#3
I thinkt he best resource for seeing if this is what you are looking for is the manual for the toolkit. This can be found below,
http://www.ni.com/pdf/manuals/371001b.pdf
I hope this helps. Please let me know if there is anything further I can do,
Best regards,
Matt Poole | Applications Engineer | National Instruments