Size prediction in archaeomalacology: the Common Mussel,Mytilus edulis L., as an example

There are numerous size prediction formulae in archaeomalacology but (like almost all zooarchaeological formulae) only a few account for allometric growth (shape change with size change, which is almost universal in complex animals) and employ the standard methods developed by statisticians to ensure reliable predictions. A general technique for generating formulae that predict organism size from dimensions of their archaeological remains is presented, using an organism that is badly preserved archaeologically (the Common Mussel Mytilus edulis). Allometric growth is fully accommodated, and standard statistical methods and software are used. Several dimensions can be used for prediction, and poor predictors are identified and discarded. Predictions can be tested for consistency between heterogeneous conditions, for statistical soundness, and whether prediction errors are within tolerable limits.