vszalay
commented
1 year ago Hi Megsie,
I just saw this email now. Did you send me this AFTER we had our talk about this?
Paul
On Tue, Nov 1, 2022 at 4:10 PM Margaret Siple @.***> wrote:
I am having trouble replicating the mean CPUE values for each INPFC area and for all districts combined. I think it is likely an issue with weighting. Paul, can you help me sleuth out how these mean CPUEs are calculated? I have the SQL script but don't know SQL well enough to decipher whether/how those means are weighted. If I could see this as an equation, that would be most helpful to me.
I assume that the area-wide mean CPUE is weighted by stratum area, correct? I.e., it follows this equation from Wakabayashi et al. 1985: [image: image] https://user-images.githubusercontent.com/73858992/199359044-476d967d-d60c-4445-8e9a-47540e5ddc0b.png
Can you help me figure out if the INPFC-area-level mean CPUEs are also weighted? Maybe still weighted by stratum area within the INPFC area? This is to replicate the information in "Table 2" (screenshot pasted below): [image: image] https://user-images.githubusercontent.com/73858992/199359227-c8b1323c-be42-492b-a7a2-ef6a9500e85d.png
— Reply to this email directly, view it on GitHub https://github.com/MargaretSiple-NOAA/goa-ai-data-reports/issues/14, or unsubscribe https://github.com/notifications/unsubscribe-auth/AEGOPDCQWDPEKRD2NYD5Y4TWGGPNTANCNFSM6AAAAAARUQXN6Y . You are receiving this because you were assigned.Message ID: @.***>
-- Paul G von Szalay, MSc. Research Fishery Biologist Alaska Fisheries Science Center, NOAA Fisheries 7600 Sand Point Way, NE Seattle, WA 98115 206-526-4153 @.***
MargaretSiple-NOAA
I am having trouble replicating the mean CPUE values for each INPFC area and for all districts combined. I think it is likely an issue with weighting. Paul, can you help me sleuth out how these mean CPUEs are calculated? I have the SQL script but don't know SQL well enough to decipher whether/how those means are weighted. If I could see this as an equation, that would be most helpful to me.
I assume that the area-wide mean CPUE is weighted by stratum area, correct? I.e., it follows this equation from Wakabayashi et al. 1985:
Can you help me figure out if the INPFC-area-level mean CPUEs are also weighted? Maybe still weighted by stratum area within the INPFC area? This is to replicate the information in "Table 2" (screenshot pasted below):