The weekly performance measure used for comparison is an average of the weeks of interest over the last 50 years, which,
1. Underweights outliers that can distort averages and overweights the observations congregating more toward
the median and,
2. Weights the most recent years 2 to 1 vs those 50 years prior.
2. Weights the most recent years 2 to 1 vs those 50 years prior.
