Hey all, I'm wondering what is the simplest package for calculating an annual stratified mean? I have raw survey data that includes counts of fish by date and stratum. I also have the stratum weights. Sample code would also be appreciated! Thanks so much! Best fishes, Laura Laura M. Lee Stock Assessment Program Manager Division of Marine Fisheries Department of Environmental Quality 252 808 8072??? office Laura.Lee at ncdenr.gov 3441 Arendell Street P.O. Box 769 Morehead City, NC 28557-0769 Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties.
Calculating annual stratified means
2 messages · Lee, Laura, Law, Jason
Laura, The survey package is the standard in R for survey analysis. Here is a simple example using example data: library(survey) data(api) # stratified sample dstrat <- svydesign( id = ~ 1, strata = ~ stype, weights = ~ pw, data = apistrat) dstrat svymean(~ api99, dstrat) # Stratified mean svyby(~ api99, by = ~ stype, dstrat, FUN = svymean) # Stratified mean by subsets - your subsets could be year if appropriate. If the survey has a complex design in time (waves, panels, etc) then it may be easier to construct a separate "svydesign" object for each year. If your PSUs are the same for each year, then you can use separate variables for each year and use svymean( ~ year1 + year2 + year3, design). HTH, Jason Law Statistician City of Portland | Environmental Services phone: 503-823-1038 -----Original Message----- From: R-sig-ecology <r-sig-ecology-bounces at r-project.org> On Behalf Of Lee, Laura Sent: Friday, September 9, 2022 9:53 AM To: r-sig-ecology at r-project.org Subject: [R-sig-eco] Calculating annual stratified means Hey all, I'm wondering what is the simplest package for calculating an annual stratified mean? I have raw survey data that includes counts of fish by date and stratum. I also have the stratum weights. Sample code would also be appreciated! Thanks so much! Best fishes, Laura Laura M. Lee Stock Assessment Program Manager Division of Marine Fisheries Department of Environmental Quality 252 808 8072??? office Laura.Lee at ncdenr.gov 3441 Arendell Street P.O. Box 769 Morehead City, NC 28557-0769 Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. _______________________________________________ R-sig-ecology mailing list R-sig-ecology at r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology