I have done a performance context analysis by pulling PEs from peer banks in our area and a separate one for banks with outstanding ratings by our regulator. All are similar business models to ours, in as much as I can find them. By averaging the PE exam data and throwing out the outliers, you get a pretty good idea of your performance. I also use asset size, not Tier 1 capital. It's not a one size fits all analysis. For the timeframe, I annualize the data and compare ours on that basis as well.