Bland-Altman Plot for Age Comparisons?
Last week I posted about a modified age bias plot. In this post I began looking more deeply at an alternative plot called the Bland-Altman plot. Below, I describe this...
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Modified Age Bias Plot
Original Age Bias Plot Campana et al. (1995) introduced the “age bias plot” to visually assess potential differences in paired age estimates (e.g., between two structures such as scales and...
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Computing SE for PSD indices
A user of my Introductory Fisheries Analyses with R book recently asked me how to compute standard errors (SE) for the various PSD indices by using the usual equation for...
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Pauly et al. (1992) Seasonal Cessation in Growth Model
I recently published a technical note in Fisheries Research (Ogle 2017) that described an algorithm for implementing the “seasonal cessation in growth model” of Pauly et al. (1992). Describing an...
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Exploring the Half-Life Property of K
A colleague recently questioned whether the loge(2)/K, where K is the Brody growth coefficient in the typical parameterization of the von Bertalanffy growth function, represents the “amount of time it...
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