virtual population analysis

[ebelda]

Hi all,

is there any example available of how to run a VPA with MARK? I would greatly appreciate any help in this topic

thanks

[dhewitt]

MARK doesn't run VPAs. You might mean PVA (population viability analysis), but even in that case so far as I know MARK doesn't do it. If you really mean VPA, as in fisheries, that involves catch-at-age data which has nothing to do with MARK.

[cooch]

MARK doesn't run VPAs. You might mean PVA (population viability analysis), but even in that case so far as I know MARK doesn't do it. If you really mean VPA, as in fisheries, that involves catch-at-age data which has nothing to do with MARK.

Not quite correct - MARK does have a VPA (Virtual Population Analysis) data type (below POPAN, above Mult-state - Live and Dead Enc.), but I would have to think hard to remember anyone who has ever used it. As such, your best source of 'insight' would normally be the MARK helpfile, but I don't think VPA is documented even there. That should tell you something.

As I recall, Gary put it into MARK to satisfy some interest of one particular colleague, but I don't think its gone much beyond that. To the point where it probably should be dropped from available data types during the next build. (IMO).

[dhewitt]

Oops. Sorry for the misinformation. I never even noticed it in the Data Type list.

[cooch]

Oops. Sorry for the misinformation. I never even noticed it in the Data Type list.

So many data types, so little time.

[ebelda]

Thanks Evan,

you are right, and because there is almost no information on the MARK help files (just a line indicating that "VPA -- Virtual Population Analysis. A version of the virtual population analysis used by fisheries biologists has been incorporated"). Because of that lack of information I was wondering where to find an example.


E. Belda

[cooch]

Thanks Evan,

you are right, and because there is almost no information on the MARK help files (just a line indicating that "VPA -- Virtual Population Analysis. A version of the virtual population analysis used by fisheries biologists has been incorporated"). Because of that lack of information I was wondering where to find an example.


E. Belda

I think you're missing the point. It isn't documented, there are no examples that I know of - suggesting strongly that you shouldn't use it.

[ebelda]

Thanks Evan,

you are right, and because there is almost no information on the MARK help files (just a line indicating that "VPA -- Virtual Population Analysis. A version of the virtual population analysis used by fisheries biologists has been incorporated"). Because of that lack of information I was wondering where to find an example.


E. Belda

I think you're missing the point. It isn't documented, there are no examples that I know of - suggesting strongly that you shouldn't use it.

Ok, I got it, thanks a lot