Known fate data--how ragged is too ragged?

questions concerning analysis/theory using program MARK

Known fate data--how ragged is too ragged?

Postby jbruggin » Fri May 27, 2005 11:53 am

We used telemetry to monitor woodcock in multiple sites and had staggered entry (daily) during part of the period of interest. We monitored the birds daily except when the crews took a day off (try as I might to talk them out of it) or when vehicle breakdowns or other problems resulted in lost field days. Thus, we have fairly complete daily encounter histories for the ~2 month field seasons except for these awkward days (e.g. days off) when the number of individuals encountered drops to zero for a given site. Is there a way to deal with this or should we start reformatting for the nest survival data type now? Thanks.

John
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Known fate data--how ragged is too ragged?

Postby gwhite » Fri May 27, 2005 1:19 pm

John:
Sounds like an easy way to handle those periods is to specify a 2-day interval for the length of the period instead of the usual 1-day default interval.
Gary
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Postby jbruggin » Fri May 27, 2005 3:12 pm

Gary,

Thanks. Just to make sure I am clear on this, would we need to use the 2-day interval throughout the period of interest or just where we have the gaps (i.e., is it legit to mix interval lengths if we are consistent among sites?).

John
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Known fate data--how ragged is too ragged?

Postby gwhite » Fri May 27, 2005 3:19 pm

John:
You would just use the 2-day interval where there are gaps.

Gary
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