Common slope
Length and weight data are pooled over sex and season
Model fit:
\[ W_{i} = \alpha L_{i} ^ {\beta} e^{z_i} \]
Where \(i\) is the individual fish and \(z_{i} \sim N(0,\sigma^2)\)
Seasonal slope
Length and weight data are pooled over sex. Constrained to have the same intercept and common error structure.
Model fit:
\[ W_{ji} = \alpha L_{ji} ^ {\beta_j} e^{z_i} \]
where \(j\) is the season and \(i\) is the individual fish. \(z_{i} \sim N(0,\sigma^2)\)