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<p>[QUOTE="Roerbakmix, post: 4128796, member: 100731"]So some of you probably know by now that I've been trying to explain, or understand, the hammered prices of coins sold at auctions. As a data-scientist (buzz-word; I'm a clinical epidemiologist), I've been coding and tweaking data on various coin type (aurei, several denari and several medieval coins). This involves a bit of automated data-mining. </p><p><br /></p><p>In this post, I'm focusing on the data-mining, I've coded an algorithm that 'looks' in the data for the following variables:</p><ol> <li>The estimated price [variable name: <b>estimate</b>]</li> <li>The hammered price [<b>hammer</b>]</li> <li>The assigned grade [<b>grade</b>]</li> <li>The auction house [<b>auction_house</b>]</li> <li>Is there a toning (e.g. 'cabinet toning) [<b>toning</b>]</li> <li>Any super-enthusiastic notes (e.g. "superb") [<b>positive_remarks</b>]</li> <li>Is the coin rare (e.g. "extremely rare") [<b>rarity</b>]<br /> </li> <li>Is the coin damaged (e.g. broken) [<b>damaged</b>]</li> <li>Is the coin slabbed or graded (e.g. NGC) [<b>slabbed</b>]<br /> </li> <li>Are there problems related to minting (e.g. rusty die) [<b>minting_problems</b>]</li> <li>Are there remarkable minting 'benefits' ("well struck") [<b>minting_pros</b>]</li> <li>Is the coin die-matched [<b>die_match</b>]</li> <li>Is there a provenance (e.g. "from the x-collection") [<b>provenance</b>]</li> <li>Is this coin a plate coin [<b>plate_coin</b>]</li> </ol><p>So, so far, 14 variables. Now I'm looking for your input. Except for the estimate, hammered price and auction house, these variables are based on different strings of text. For example, the variable "<b>toning</b>" is based on the following strings:</p><ul> <li>bronzepatina</li> <li>cabinet</li> <li>patina</li> <li>tone</li> <li>toned</li> <li>toning</li> <li>tönung</li> </ul><p>...the variable "<b>positive_remarks</b>" on the following:</p><ul> <li>attractive</li> <li>wonderful</li> <li>interesting</li> <li>important type</li> <li>fascinating</li> <li>attractively</li> <li>eye appeal</li> <li>splendid</li> <li>Strong portrait</li> <li>desirable</li> <li>pleasing</li> <li>superb</li> <li>premium quality</li> </ul><p>... and the variable "<b>rarity</b>" is based on these:</p><ul> <li>rare</li> <li>rarest</li> <li>scarce</li> <li>unrecorded</li> <li>selten</li> <li>unpublished</li> <li>unique</li> <li>key coin</li> <li>mule</li> <li>uncommon</li> <li>finest known</li> <li>Rarity</li> <li>seltene</li> <li>recorded</li> <li>Unrecorded </li> </ul><p>So, a description containing the sentence "<i>Good VF, toned. Attractive style. Rare.</i>" will result in: </p><ul> <li><b>Toning</b> = true</li> <li><b>Positive_remarks </b>= true</li> <li><b>Rarity </b>= true</li> </ul><p>You might agree (or not) that these variables say <i>something </i>about the value of a coin (you can actually test this). Now what I'm looking for is the following: I need some input on these variables. </p><p><br /></p><p>So, here they are:</p><p><b>Damage: </b>(mild damage)</p><ul> <li>prüfhieb</li> <li>test cuts</li> <li>test cutss</li> <li>edge cut</li> <li>edge cuts</li> <li>banker</li> <li>banker-mark</li> <li>banker mark</li> <li>banker\'s mark</li> <li>bankers' marks</li> <li>countermark</li> <li>damage</li> <li>damaged</li> <li>metal flaw</li> <li>graffiti</li> <li>cleaning marks</li> <li>weakness</li> <li>scrapes</li> <li>kratzer</li> <li>corrosion</li> <li>korrosion</li> <li>porous</li> <li>grainy</li> <li>rough</li> <li>flan flaw</li> <li>hairlines</li> <li>damaged</li> <li>damaged</li> <li>scraped</li> <li>flan-crack</li> <li>bent</li> <li>korrosionsspuren</li> <li>schrötlingsrisse</li> <li>roughness</li> <li>porosity</li> <li>deposits</li> <li>flaw</li> <li>scratches</li> <li>scratch</li> <li>chop-mark</li> <li>circulated</li> <li>smoothed</li> <li>cleaned</li> <li>hairline</li> <li>Schrötlingsriss</li> <li>chipped</li> <li>creased</li> <li>korrodiert</li> <li>corroded</li> <li>Schrötlingsriß</li> <li>chip</li> <li>crimped</li> <li>overcleaned</li> </ul><p><b>Damage: </b>(severe damage)</p><ul> <li>broken</li> <li>broke</li> <li>crack</li> <li>repaired</li> <li>repair</li> <li>crystallized</li> <li>hole</li> <li>holed</li> <li>bronzepest</li> <li>Altered surfaces</li> <li>tooled</li> <li>Artificial toning</li> <li>Retoned</li> <li>pierced</li> <li>Durchbrüche</li> <li>fragment</li> <li>fragments</li> <li>GEBROCHENES</li> <li>GEKLEBTES</li> <li>Abbruch</li> </ul><p><b>Minting_problems</b></p><ul> <li>unregelmäßiger schrötling</li> <li>worn reverse die</li> <li>worn obverse die</li> <li>stempelausbruch</li> <li>doppelschl</li> <li>irregular flan</li> <li>prägeschwächen</li> <li>worn die</li> <li>stempelfehler</li> <li>wavy flan</li> <li>schrötlingsfehler</li> <li>knapper schrötling</li> <li>off-center</li> <li>off center</li> <li>flat strike</li> <li>weak strike</li> <li>dezentriert</li> <li>belagreste</li> <li>die crack</li> <li>die rust</li> <li>die clash</li> <li>low relief</li> <li>die wear</li> <li>flow lines</li> <li>gewellt</li> <li>rusted</li> <li>blundered</li> </ul><p><b>Minting_pros</b></p><ul> <li>large flan</li> <li>wide flan</li> <li>broad flan</li> <li>breiter schrötling</li> <li>luster</li> <li>lustrous</li> <li>iridescent</li> <li>stempelglanz</li> <li>hohes relief</li> <li>well struck</li> <li>good strike</li> <li>well-centered</li> <li>well centered</li> <li>perfect strike</li> <li>as struck</li> <li>full strike</li> <li>Lustre</li> </ul><p><b>Provenance</b></p><ul> <li>provenance</li> <li>collection</li> <li>sammlung</li> <li>erworben</li> <li>from the inventory</li> <li>from a private</li> <li>provenienzen</li> <li>Pedigree</li> <li>purchased </li> </ul><p><b>Die_match</b></p><ul> <li>same obv. die</li> <li>same rev. die</li> <li>same dies</li> <li>stempelgleich</li> <li>die match</li> <li>same die</li> </ul><p><b>Plate_coin</b></p><ul> <li>plate coin</li> <li>this coin published</li> <li>this coin illustrated</li> <li>this coin cited</li> <li>this coin, illustrated</li> <li>this coin</li> </ul><p><b>Slabbed</b></p><ul> <li>ngc</li> <li>slabbed</li> <li>certified</li> <li>encapsulated</li> <li>Slabbed</li> <li>PNG</li> <li>PCGS</li> <li>PNG</li> <li>holder</li> </ul><p>[/QUOTE]</p><p><br /></p>
[QUOTE="Roerbakmix, post: 4128796, member: 100731"]So some of you probably know by now that I've been trying to explain, or understand, the hammered prices of coins sold at auctions. As a data-scientist (buzz-word; I'm a clinical epidemiologist), I've been coding and tweaking data on various coin type (aurei, several denari and several medieval coins). This involves a bit of automated data-mining. In this post, I'm focusing on the data-mining, I've coded an algorithm that 'looks' in the data for the following variables: [LIST=1] [*]The estimated price [variable name: [B]estimate[/B]] [*]The hammered price [[B]hammer[/B]] [*]The assigned grade [[B]grade[/B]] [*]The auction house [[B]auction_house[/B]] [*]Is there a toning (e.g. 'cabinet toning) [[B]toning[/B]] [*]Any super-enthusiastic notes (e.g. "superb") [[B]positive_remarks[/B]] [*]Is the coin rare (e.g. "extremely rare") [[B]rarity[/B]] [*]Is the coin damaged (e.g. broken) [[B]damaged[/B]] [*]Is the coin slabbed or graded (e.g. NGC) [[B]slabbed[/B]] [*]Are there problems related to minting (e.g. rusty die) [[B]minting_problems[/B]] [*]Are there remarkable minting 'benefits' ("well struck") [[B]minting_pros[/B]] [*]Is the coin die-matched [[B]die_match[/B]] [*]Is there a provenance (e.g. "from the x-collection") [[B]provenance[/B]] [*]Is this coin a plate coin [[B]plate_coin[/B]] [/LIST] So, so far, 14 variables. Now I'm looking for your input. Except for the estimate, hammered price and auction house, these variables are based on different strings of text. For example, the variable "[B]toning[/B]" is based on the following strings: [LIST] [*]bronzepatina [*]cabinet [*]patina [*]tone [*]toned [*]toning [*]tönung [/LIST] ...the variable "[B]positive_remarks[/B]" on the following: [LIST] [*]attractive [*]wonderful [*]interesting [*]important type [*]fascinating [*]attractively [*]eye appeal [*]splendid [*]Strong portrait [*]desirable [*]pleasing [*]superb [*]premium quality [/LIST] ... and the variable "[B]rarity[/B]" is based on these: [LIST] [*]rare [*]rarest [*]scarce [*]unrecorded [*]selten [*]unpublished [*]unique [*]key coin [*]mule [*]uncommon [*]finest known [*]Rarity [*]seltene [*]recorded [*]Unrecorded [/LIST] So, a description containing the sentence "[I]Good VF, toned. Attractive style. Rare.[/I]" will result in: [LIST] [*][B]Toning[/B] = true [*][B]Positive_remarks [/B]= true [*][B]Rarity [/B]= true [/LIST] You might agree (or not) that these variables say [I]something [/I]about the value of a coin (you can actually test this). Now what I'm looking for is the following: I need some input on these variables. So, here they are: [B]Damage: [/B](mild damage) [LIST] [*]prüfhieb [*]test cuts [*]test cutss [*]edge cut [*]edge cuts [*]banker [*]banker-mark [*]banker mark [*]banker\'s mark [*]bankers' marks [*]countermark [*]damage [*]damaged [*]metal flaw [*]graffiti [*]cleaning marks [*]weakness [*]scrapes [*]kratzer [*]corrosion [*]korrosion [*]porous [*]grainy [*]rough [*]flan flaw [*]hairlines [*]damaged [*]damaged [*]scraped [*]flan-crack [*]bent [*]korrosionsspuren [*]schrötlingsrisse [*]roughness [*]porosity [*]deposits [*]flaw [*]scratches [*]scratch [*]chop-mark [*]circulated [*]smoothed [*]cleaned [*]hairline [*]Schrötlingsriss [*]chipped [*]creased [*]korrodiert [*]corroded [*]Schrötlingsriß [*]chip [*]crimped [*]overcleaned [/LIST] [B]Damage: [/B](severe damage) [LIST] [*]broken [*]broke [*]crack [*]repaired [*]repair [*]crystallized [*]hole [*]holed [*]bronzepest [*]Altered surfaces [*]tooled [*]Artificial toning [*]Retoned [*]pierced [*]Durchbrüche [*]fragment [*]fragments [*]GEBROCHENES [*]GEKLEBTES [*]Abbruch [/LIST] [B]Minting_problems[/B] [LIST] [*]unregelmäßiger schrötling [*]worn reverse die [*]worn obverse die [*]stempelausbruch [*]doppelschl [*]irregular flan [*]prägeschwächen [*]worn die [*]stempelfehler [*]wavy flan [*]schrötlingsfehler [*]knapper schrötling [*]off-center [*]off center [*]flat strike [*]weak strike [*]dezentriert [*]belagreste [*]die crack [*]die rust [*]die clash [*]low relief [*]die wear [*]flow lines [*]gewellt [*]rusted [*]blundered [/LIST] [B]Minting_pros[/B] [LIST] [*]large flan [*]wide flan [*]broad flan [*]breiter schrötling [*]luster [*]lustrous [*]iridescent [*]stempelglanz [*]hohes relief [*]well struck [*]good strike [*]well-centered [*]well centered [*]perfect strike [*]as struck [*]full strike [*]Lustre [/LIST] [B]Provenance[/B] [LIST] [*]provenance [*]collection [*]sammlung [*]erworben [*]from the inventory [*]from a private [*]provenienzen [*]Pedigree [*]purchased [/LIST] [B]Die_match[/B] [LIST] [*]same obv. die [*]same rev. die [*]same dies [*]stempelgleich [*]die match [*]same die [/LIST] [B]Plate_coin[/B] [LIST] [*]plate coin [*]this coin published [*]this coin illustrated [*]this coin cited [*]this coin, illustrated [*]this coin [/LIST] [B]Slabbed[/B] [LIST] [*]ngc [*]slabbed [*]certified [*]encapsulated [*]Slabbed [*]PNG [*]PCGS [*]PNG [*]holder [/LIST][/QUOTE]
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