Simulated von Bertalanffy datasets — simulated

Three example datasets generated with simulate_vb_growth_data() to illustrate common sample-size scenarios (imbalanced, larger balanced, and limited sample sizes) for fitting and testing von Bertalanffy growth and maturity relationships.

Usage

imbalanced_data

growth_data

limited_data

Format

A data.table::data.table with 5 columns:

sex: Character. Sex for non-embryo observations ("female" or "male"); NA for embryo rows.
mat: Integer. Maturity indicator for non-embryo observations (0 = immature, 1 = mature); NA for embryo rows.
fl: Numeric. Fork length (cm). For embryos, this is the embryo length measurement.
age: Numeric. Age (years) for non-embryo observations; NA for embryo rows.
embryo: Logical. TRUE for embryo observations; FALSE otherwise.

An object of class data.table (inherits from data.frame) with 197 rows and 5 columns.

An object of class data.table (inherits from data.frame) with 391 rows and 5 columns.

An object of class data.table (inherits from data.frame) with 47 rows and 5 columns.

Details

All three datasets share the same structure and are intended as lightweight, reproducible examples for package vignettes, unit tests, and demonstrations. Non-embryo observations are simulated from a von Bertalanffy growth model with sex-specific parameter distributions, observation error on length, a truncated-exponential age distribution (older ages increasingly rare), and a sex-specific logistic maturity ogive on observed length. Embryo rows include lengths only and are flagged with embryo = TRUE.

Dataset-specific sizes:

imbalanced_data: Default call to simulate_vb_growth_data() (defaults: 150 females, 34 males, 13 embryos).
growth_data: Larger dataset (189 females, 176 males, 26 embryos; seed = 1234).
limited_data: Small dataset (24 females, 18 males, 5 embryos; seed = 12345).