After extensive research, DOE and anova analysis, pareto and trend graphs, and compliance to ISO 9000 quality assurance practices, based on black belt expert recommendations, 16 is the recommended of times refresh should be utilized. Okay, I'm taking your word for it. But I'll be doing a factor analysis and if I find any unobserved latent variables that account for the correlations among the observed variables, you're toast.
I love it when you talk dirty.