The Woods Hole Assessment Model (WHAM) is a general state-space age-structured stock assessment framework designed to include environmental effects on population processes. The state-space framework is attractive because it can estimate observation and process error, as well as naturally propagate random effect parameters in stock projections. WHAM can be configured to estimate a range of assessment models (see Ex 1 and Ex 6):
- statistical catch-at-age (SCAA) model with recruitments as fixed effects,
- SCAA with recruitments as random effects
- "full state-space model", abundance at all ages are random effects
WHAM advances fisheries assessment because it can estimate constrained random deviations, i.e. random effects, on parameters such as:
- recruitment / numbers-at-age (Ex 2 and Ex 6),
- selectivity (Ex 4),
- natural mortality (Ex 5), and
- environmental effects on the above (Ex 2 and Ex 5)
A nice property of treating population and environmental processes as random effects is that their uncertainty is naturally propagated in projections/forecasts (Ex 3).
Overview of WHAM presentation (Jan 8 2021): https://www.youtube.com/watch?v=o8vJvbIaOdE
WHAM generalizes and extends R and TMB code from Miller et al. (2016), Miller and Hyun 2018, and Miller et al. 2018. WHAM has many similarities to ASAP (code, Legault and Restrepo 1998), including the input data file structure. Many of the plotting functions for input data, results, and diagnostics are modified from ASAP code written by Chris Legault and Liz Brooks (ASAPplots).
A paper describing WHAM has been published, which includes the model equations, simulation tests, and demos of random effects options for numbers-at-age, M, selectivity, and environment-recruitment: https://doi.org/10.1016/j.fishres.2021.105967.
Stock et al. (2021) describes the 2D (year x age) AR(1) correlation structure that can be used on numbers-at-age, M, and selectivity in WHAM (as in Berg and Nielsen 2016, Cadigan 2016, and Xu et al. 2019).
WHAM is written in R and TMB, and would not be possible without these superb open-source tools. For more information, see:
For the latest stable, tested release:
devtools::install_github("timjmiller/wham", dependencies=TRUE)
For the development version with recent bug fixes and features (potentially untested):
devtools::install_github("timjmiller/wham", dependencies=TRUE, ref="devel")
If you get an error about cc1plus.exe running out of memory during installation, try installing only 64bit:
devtools::install_github("timjmiller/wham", dependencies=TRUE, INSTALL_opts=c("--no-multiarch"))
or for the devel branch:
devtools::install_github("timjmiller/wham", dependencies=TRUE, ref = "devel", INSTALL_opts=c("--no-multiarch"))
If you're having problems with dependencies not installing. It is probably because some are being used in one or more R sessions. After closing all R sessions and restarting R without any packages first check make sure no packages are loaded (even by e.g. .Rprofile):
ls() ## no variables
search() ## no packages other than Base
Then:
to.install <- c("plotrix","ellipse","Hmisc","gplots","fields","RColorBrewer","colorspace","mnormt","Deriv","tidyr","dplyr","ggplot2","viridis", "abind", "rmarkdown", "pander", "kableExtra")
new.packages <- to.install[!(to.install %in% installed.packages()[,"Package"])]
if(length(new.packages)) install.packages(new.packages)
Then use one of the calls above to install wham.
If you want pdfs of parameter tables that are generted by plot_wham_output you will need a tex installation. If you do not use RStudio, use the tinytex package:
install.packages("tinytex")
tinytex::install_tinytex()
and add the path to pandoc in your .Rprofile so Rmarkdown can find your pandoc
Sys.setenv(RSTUDIO_PANDOC = "path/to/your/pandoc")
We suggest walking through the vignettes to familiarize yourself with WHAM: https://timjmiller.github.io/wham/articles.
Clean, runnable .R scripts for most vignettes are also available in the example_scripts folder of the wham package install:
library(wham)
wham.dir <- find.package("wham")
file.path(wham.dir, "example_scripts")
You can then run the entire first example script with:
setwd("choose/where/to/save/output")
source(file.path(wham.dir, "example_scripts", "ex1_SNEMA_yellowtail_flounder.R"))
You can run ALL examples with (takes 1 hour):
library(wham)
wham.dir <- find.package("wham")
source(file.path(wham.dir, "example_scripts", "run_all_examples.R"))
Installation from GitHub does not include the vignettes by default because they can be accessed online anytime at https://timjmiller.github.io/wham/articles. If you want to build the vignettes locally, they look best if you build using R Studio:
devtools::install_github("timjmiller/wham", dependencies=TRUE, build_vignettes = TRUE, build_opts = c("--no-resave-data", "--no-manual"))
View installed vignettes:
browseVignettes("wham")
Kristensen, K., Nielsen, A., Berg, C. W., Skaug, H., and Bell, B. M. 2016. TMB: Automatic differentiation and Laplace approximation. Journal of Statistical Software 70(5): 1–21. doi: 10.18637/jss.v070.i05.
Legault, C. M. and Restrepo, V. R. 1998. A flexible forward age-structured assessment program. ICCAT. Col. Vol. Sci. Pap. 49: 246-253. link
Miller, T. J., Hare, J. A., and Alade, L. A. 2016. A state-space approach to incorporating environmental effects on recruitment in an age-structured assessment model with an application to Southern New England yellowtail flounder. Canadian Journal of Fisheries and Aquatic Sciences 73(8): 1261-1270. doi: 10.1139/cjfas-2015-0339
Miller, T. J. and Hyun, S-Y. 2018. Evaluating evidence for alternative natural mortality and process error assumptions using a state-space, age-structured assessment model. Canadian Journal of Fisheries and Aquatic Sciences 75(5): 691-703. doi: 10.1139/cjfas-2017-0035
Miller, T. J., O’Brien, L., and Fratantoni, P. S. 2018. Temporal and environmental variation in growth and maturity and effects on management reference points of Georges Bank Atlantic cod. Canadian Journal of Fisheries and Aquatic Sciences 75(12): 2159-2171. doi: 10.1139/cjfas-2017-0124
R Core Team. 2020. R: A Language and Environment for Statistical Computing. R Foundation for Statistical Computing, Vienna, Austria. https://www.r-project.org/
Stock, B. C., and Miller, T. J. 2021. The Woods Hole Assessment Model (WHAM): A general state-space assessment framework that incorporates time- and age-varying processes via random effects and links to environmental covariates. Fisheries Research, 240: 105967. doi: 10.1016/j.fishres.2021.105967
Stock, B. C., Xu, H., Miller, T. J., Thorson, J. T., and Nye, J. A. 2021. Implementing two-dimensional autocorrelation in either survival or natural mortality improves a state-space assessment model for Southern New England-Mid Atlantic yellowtail flounder. Fisheries Research, 237: 105873. doi: 10.1016/j.fishres.2021.105873
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