I don’t trust my measurements as much in the stubble case, because of the risk of particles leaking into the bag through its exit. So presenting the other cases as relative to stubble risks compounding error.
If the relevant counterfactual is not masking, then I think I’m giving these reductions the right way around?
As a different way of looking at it: a short beard lets 26.7x more particles past than stubble, and a long beard lets 66.7x more particles past.
I don’t trust my measurements as much in the stubble case, because of the risk of particles leaking into the bag through its exit. So presenting the other cases as relative to stubble risks compounding error.
If the relevant counterfactual is not masking, then I think I’m giving these reductions the right way around?