Log in or Sign up
Coin Talk
Home
Forums
>
Coin Forums
>
US Coins Forum
>
PCGS Regrade Question
>
Reply to Thread
Message:
<p>[QUOTE="calcol, post: 4529494, member: 77639"]Grading is a subjective activity. The same person grading the same coin over and over with an interval to allow forgetfulness will not always come up with the same grade for it. Same is true for a small group of graders. Statistically speaking, there is variance in grading ... and it will be there even without a change in standards and no matter how expert and conscientious the graders.</p><p><br /></p><p>Look at the grades for coins in a GTG post on cointalk ... usually a good spread. Professionals will also have a spread ... just won't be as big ... i.e. less variance. There is variance between graders and also variance within a grader or group of graders if asked to do serial grades on the same coins. This latter is what affects regrading ... often called repetition variance.</p><p><br /></p><p>Grading services may try to lower the variance by letting graders know the current grade of the coin. If they know the current grade, they have to justify in their own minds disputing the grade assigned by their predecessors (it may even be their grade!). This will bias them toward not changing the grade. I've heard different stories as to whether graders know the existing grade of a coin. </p><p><br /></p><p>So, a coin owner can use the variance in regrading or reconsideration (these are a little different) to try for a better grade and sometimes be successful.</p><p><br /></p><p>Grading services stand by their grade only if the grade goes down in a regrade or reconsideration. If your coin goes up in grade, well ... you lucked out by hitting the upside of the bell curve for grading.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>
[QUOTE="calcol, post: 4529494, member: 77639"]Grading is a subjective activity. The same person grading the same coin over and over with an interval to allow forgetfulness will not always come up with the same grade for it. Same is true for a small group of graders. Statistically speaking, there is variance in grading ... and it will be there even without a change in standards and no matter how expert and conscientious the graders. Look at the grades for coins in a GTG post on cointalk ... usually a good spread. Professionals will also have a spread ... just won't be as big ... i.e. less variance. There is variance between graders and also variance within a grader or group of graders if asked to do serial grades on the same coins. This latter is what affects regrading ... often called repetition variance. Grading services may try to lower the variance by letting graders know the current grade of the coin. If they know the current grade, they have to justify in their own minds disputing the grade assigned by their predecessors (it may even be their grade!). This will bias them toward not changing the grade. I've heard different stories as to whether graders know the existing grade of a coin. So, a coin owner can use the variance in regrading or reconsideration (these are a little different) to try for a better grade and sometimes be successful. Grading services stand by their grade only if the grade goes down in a regrade or reconsideration. If your coin goes up in grade, well ... you lucked out by hitting the upside of the bell curve for grading. Cal[/QUOTE]
Your name or email address:
Do you already have an account?
No, create an account now.
Yes, my password is:
Forgot your password?
Stay logged in
Coin Talk
Home
Forums
>
Coin Forums
>
US Coins Forum
>
PCGS Regrade Question
>
Home
Home
Quick Links
Search Forums
Recent Activity
Recent Posts
Forums
Forums
Quick Links
Search Forums
Recent Posts
Competitions
Competitions
Quick Links
Competition Index
Rules, Terms & Conditions
Gallery
Gallery
Quick Links
Search Media
New Media
Showcase
Showcase
Quick Links
Search Items
Most Active Members
New Items
Directory
Directory
Quick Links
Directory Home
New Listings
Members
Members
Quick Links
Notable Members
Current Visitors
Recent Activity
New Profile Posts
Sponsors
Menu
Search
Search titles only
Posted by Member:
Separate names with a comma.
Newer Than:
Search this thread only
Search this forum only
Display results as threads
Useful Searches
Recent Posts
More...