Slug weight (gm) and length (cm)
weight = a × length p
log (wt) = log (a) + p × log (len)
This diagram gives two methods of predicting the response. The first method is:
Click on the scatterplot at any length (or log-length) to apply this method.
Select Using original scale from the pop-up menu to directly find the prediction from the nonlinear equation. (However the first method is easier to extend to find prediction intervals.)
99 slugs of the species Limax maximus were collected by two researchers. The slugs were preserved in a relaxed state and subsequently their weight (gm) and length (cm) recorded.
Limax maximus: A, lateral aspect; B, dorsal aspect
Since weight is related to volume, it was anticipated that weight might be proportional to (length)3.