State of the field There's not much reference to similar software. There are various software packages, e.g., spict, aspic, jabba, for surplus production models that estimate intrinsic rate of increase and carrying capacity. These model a unit stock without spatial considerations. However, sspm does not appear to estimate the inherent productivity of a population. Rather, sspm appears to use GAMs to estimate surplus production and productivity (C_y + B_y)/C_y-1 over space and time, as well as with any covariates provided to the model (I am not currently able to fully review the methodology underlying the package as I don't have access to the Pedersen et al. Res Doc).

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No description provided.

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link to the research doc: https://www.dfo-mpo.gc.ca/csas-sccs/Publications/ResDocs-DocRech/2022/2022_062-eng.html

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for the record:

• jabba https://github.com/jabbamodel/JABBA
• aspic https://www.mhprager.com/aspic.html
• spict https://github.com/DTUAqua/spict