Pcgs coinfacts, sorting based on rariety
DontTellTheWife
Posts: 612 ✭✭✭
So we all use pcgs coin facts,and their survival estimates are sometimes useful, and they rank a coin x/xxx based on rariety within the,series, but does anyone know how to pull and sort this data to generate a list ?????
Thanks
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The above is for the 1846 half dime, business strike.
Is your goal to get this info for each date/mint mark in a series, then sort it by rarity?
You could copy/paste the text of the table from the web into Excel. It would take awhile....
Another way would be to write a web page parser that would "scrape" these data from each page for date/mint mark.
You can do this sort of thing with Java, libcurl, etc.
It seems like it would be easier to use the PCGS Population Reports for this sort of thing.
For example:
https://www.pcgs.com/pop/detail.aspx?c=93
Should be fairly easy to copy/paste into Excel, and then you could sort it by whatever column you are interested in.
The goal is an easy to view, easy to do list from "rarest" to most common within each series. So with your example , seated half dimes , be able to see a list from 1 to 79.
Without having to crazy copy/pasting and without having to go into each date.
So again with your example you say to yourself , ok the 1846 is the 14th (out of 79) scarcest of all seated half dimes. Hmmm, I wonder what 1 to 13 are.
I need to find ,,and pcgs needs to have a button where that list just appears!!!!
This might be a feature in the CoinFacts smartphone app. (I don't know, since I don't use a smartphone).
P.S. There is a bias when looking at rarity over all grades, because the more valuable coins like the 1846 tend to be slabbed more often in lower grades than the less valuable like the 1844-O. So it seems more appropriate to use a metric that compares using equal grades. For example, the MS/PR count ranks 1846 as #2 behind the 1870-S, which is more accurate.
Some of the estimates seem to be on the low side. For instance, the total survival estimate for the 1904 Indian cent is in the mid four figures, only slightly higher than the total survival estimate for the 1877 Indian cent.
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I access coinfacts from a smartg phone and I cannot find a hot l ink to what I'm looking for. Nor can I fijnd it on a tablet.
The rariety rankings I fijnd most useful are the all grades ranking. I believe these estimates are n or based on certified pops
True. Some may be off, but it gives you something to consider as you study/research/think about things.
Survival estimates based on TPG submissions alone, are of very limited utility.
I think they are ALL off, often considerably. Consider carefully what Overdate is saying about the 1904 cent versus the 1877 cent. They estimate similar survival estimates when there are multiple dozen 1904 cents in my Indian junk box and not one 1877. This is not an isolated anomaly.
Last fall I put together an exhibit of early U.S. gold type coins. Part of my research included rarity estimates for each major type. I used information from “Coin Facts,” David Bowers type coin “Red Book” and the combined figures from the Early U.S. Gold Coin Variety book by John Dannreuther and Harry Bass.
After comparing the figures, I used the Dannreuther – Bass estimates because they seemed to be the most reasonable to me. The “Coin Facts” numbers seemed low and the Bowers numbers looked a bit high to me, given my experience.
To cite an example, “Coin Facts” estimates that there are 88, 1796 No Stars Quarter Eagles. The Bowers low end estimate is 170. The Dannreuther – Bass range for the two varieties, one of which is rare, is 104 to 131. That range as well as the other ranges from Dannreuther – Bass book seemed more in line to me.
Remember, estimates are guesses based on limited information....These are even more nebulous than grading opinions. Cheers, RickO