Dimension of Generic Reals

This paper investigates the Hausdorff measure of certain sets of generics in computability theory. Let $\Gamma$ be the Turing ideal in which we take the dense open sets. The set of $\Gamma$-Cohen generics has measure positive if and only if the gauge function is not dominated by every element in $\Gamma$, under some mild restrictions on the gauge function. The set of $\Gamma$-Mathias generics and the set of $\Gamma$-Sacks generics have measure positive if and only if the gauge function eventually dominates every element in $\Gamma$. This gives some comparison between the behavior of reals in the set and the measure of the set.