The FAA requires 3 landings every 90 days to stay 'current', but as we all know, currency and proficiency are different things.
I'm looking for data than can describe how proficiency loss correlates with various factors. Relevant factors might include how long it's been seen you've flown, how much flying you've done in the last ____ days/months, how much time in type, time in seat, or total experience, etc.
And if there are evidence-based guidelines for how much flying a pilot should do to stave off loss of proficiency, I'd like to see that as well.
I understand that it's impossible to accurately calculate how proficient someone is based on unique individual traits. That's not what I'm trying to do. Like the title says, I'm trying to quantify what's typical for "loss of proficiency due to lack of flying". In other words, how does flying 10 hours in 90 days compare to flying 10 hours in 6 months, as it pertains to proficiency degradation and, ultimately, increased risk of an accident/incident.