Thanks guys. I can generate the same plot but by using the logarithm of the mintage values on the x-axis and the same logarithm of the price on the y-axis:
The reason that I am using the z-value on the x-axis on my plots is so that I can compare directly between different coin sets (walkers, IHC
, etc.) of different mintages. This is something that I am currently working on. The z-value gives a measure of the relative mintage within a set
. The concept of a log-log plot is simple. It gives a sort of macroscopic view of the graph when large numbers are involved. Compare that with the following simple graph which, in my opinion, does not give much useful visual information:
Now getting to the other question you raised. When I use the MS-63 prices you see more "floaters" (for lack of a technical term), where a larger proportion of higher mintage coins have been elevated in price. I believe that the G-4 price scale gives a better reflection on price/mintage trends, as opposed to which ones are harder to find in UNC condition.