Joint distributions of error terms for primes in arithmetic progressions modulo 11

We provide a formula for the logarithmic density of the set of positive real numbers on which two prime counting functions $\psi (x;q,a)$ and $\psi (x;q,b)$ are simultaneously larger than their asymptotic main terms, as well as a method for calculating the numerical values of such densities with rigorously bounded errors. We apply these formulas to the pairwise races in the case $q=11$, determining which pairs of residues $a$ and $b$ are more or less correlated in this way. The outcomes when $q=11$ provide a deeper mathematical illumination of the “mirror image” and “cyclic ordering” phenomena observed by Bays and Hudson.