Grading experiment, Debriefing.

mgoodm3

OK so here goes the results of the grading quiz from yesterday with number results.

Coin #1 1868 cent PCGS 64RB

Small pics: Ave 64.0 SD .92
Big pics: Ave 64.0 SD 2.8

Grading for this coin was pretty good, although people wavered around more with the big pics


Coin #2 1905 cent PCGS 65RD

Small pics: Ave 65.1 SD .82
Big pics: Ave 64.2 SD 1.88

People got harsher with the big pics and the grades moved around a bit more.


Coin #3 1964 quarter NGC 64

Small pics: Ave 64.8 SD 2.0
Big pics: Ave 64.5 SD 1.66

Big pics seemed to help grading this darkly toned coin. Quite a few hits on the cheek that you can't see until you get big pics.

Coin #4 1943 quarter PCGS 65

Small pics: Ave 65.7 SD .89
Big pics: Ave 65.5 SD .87

Grading tightened a bit on this with bigger pics. Only one 67 given with big pics vs 5 with small pics.

coinkat

can I buy the 43 quarter at 65 money?

Interesting thread with results on the last coin that I find alittle surprising.

clackamas

That is pretty cool. I wonder if a coin could be determined to be PQ or an upgrade shot by this method.

Russ

Three out of four of the coins were undergraded by the services.

Russ, NCNE

mgoodm3

Seems that people had a harder time with the copper, but did better with the small pics and tended self-destruct with the big pics.

The 43 quart has a line/scratch in front of the nose and a couple reed marks on the neck which would keep it from 66 in my view.

BillJones

I wish I could find a steady diet of 1868 cents that look like that coin in MS-64 holders at MS-64 brown money. The only thing that was wrong with that coin was that it was not Red or R&B.

mgoodm3

Plus the 1868 is a new variety of repunched 1 not previously attributed in Snow's book.

charley

I absolutely concur with BillJones on that piece.

DNADave

A very interesting sampling. How many people here know what a standard deviation is?

relayer

How different are the results if you look at just the people who graded both sizes ?

TommyType

Interesting, and enjoyable exercise.

Not surprising to me that nearly all of the grades dropped with the larger pictures.

I think one thing we all knew is that you can't grade a coin if you can't see the marks! That '43 quarter BOOMED at a distance with both luster and strike, resulting in the 67 grades. You needed the closeup to really judge the coin.

BigGreek

<< <i>Interesting, and enjoyable exercise.

Not surprising to me that nearly all of the grades dropped with the larger pictures.

I think one thing we all knew is that you can't grade a coin if you can't see the marks! That '43 quarter BOOMED at a distance with both luster and strike, resulting in the 67 grades. You needed the closeup to really judge the coin. >>



I still this the 43 is a 66

TommyType

ttt for those looking for results.

Shamika

I'm very pleased with how I did. However, I can't see how the 1868 cent could be called RB when the reverse was COMPLETELY brown and the obverse only had a smidget of red visible.

mgoodm3

My pics are a bit dark. The obv has quite a lot of red on it.