Knowledge (XXG)

Graduated majority judgment

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In the unusual case of a tie where the formula above does not determine a single winner (if several candidates have exactly the same score), ties can be broken by binning together the 3 grades closest to the median, then repeating the tie-breaking procedure. In the example above, we would combine all
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The tiebreaking rule can be explained using an analogy where every candidate is in a race. Each candidate takes 1 minute to run from one grade to the next, and they run at a constant speed when moving from one grade to the next. The winner is the first candidate to cross the finish line at 50% of the
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This property makes the graduated majority judgment a more robust voting method in the face of accusations of fraud or demands of a recount of all votes. As small differences of votes are less likely to change the outcome of the election, candidates are less likely to contest results.
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GMJ begins by counting all ballots for their first choice. If no candidate has a majority then later (second, third, etc.) preferences are added to first preferences until one candidate reaches 50% of the vote. The first candidate to reach a majority of the vote is the winner.
2146:"I propose to coin the term MEDIAN JUDGMENT for a voting rule that is known both as the "usual judgment" and the "graduated majority judgment". I have just had an Aha moment: this rule deserves the title of the best highest-median voting rule. Let me explain why" 1619:
Candidates A and B both cross the 50% threshold between 2 or 3, so we must invoke the tiebreaking procedure. When we do, we find that the median grades for candidates A, B, and C are 3.4, 3.1, and 2.0 respectively. Thus, Candidate A is declared the winner.
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grade as the grade where a majority of voters would oppose giving the candidate a higher grade, but a majority would also oppose giving a lower grade. This rule means that the absolute majority of the electors judge that a candidates merits
1907:"Good," "Fair," and "Passable" grades into a new "Passable to Good" grade, then apply the same tie-breaking formula as before. This process can be repeated multiple times (binning more and more grades) until a winner is found. 1897: 1974:. In other words, a small change in the number of votes for each candidate is unlikely to change the winner of the election, because small changes in vote shares result in only small changes in the overall rating. 1986:
The additional tie-breaking procedures of graduated majority judgment mean that tied elections become extremely unlikely (far less likely than systems such as plurality). Whereas plurality votes,
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can result in ties when working with small elections, the only way for two candidates to tie with usual judgment is to have all candidates receive exactly the same number of votes in
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by Andrew Jennings in 2010, then by Jameson Quinn, and later independently by the French social scientist Adrien Fabre in 2019. In 2024, the latter coined the name "
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When counting the votes, we calculate the share of each grade for each of the votes cast. This is the candidate's "merit profile":
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grade category, implying the chances of an undetermined election fall exponentially with the number of grades.
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Consider the same election as before, but relabeling the verbal grades as numbers on a scale from 0 to 6:
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The tie-breaking formula of the graduated majority judgment presents specific advantages over the other
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A plot showing how the overall score of a candidate can be calculated using graduated majority judgment.
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As an electoral system, the graduated majority judgment shares most of its advantages with other
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The function defined by the graduated majority judgment tie-breaking formula is a
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If only one candidate has the highest median grade, they are elected (as in all
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Monotonicity and Manipulability of Ordinal and Cardinal Social Choice Functions
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in which the winner is decided by the median rating rather than the mean.
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method to break ties. This rule is easier to explain than others such as
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the share of voters who assign an approval less than the given score
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its median grade, while half the electors judge that he deserves
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Graphically, we can represent this by drawing a plot showing
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a score strictly better than the median grade. The share of
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Advantages and disadvantages common to highest-median rules
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Arizona State University. pp. 25–30. 2415: 2228: 2214: 2206: 1405: 1372:Graduated majority judgment uses a simple 1044: 1030: 120: 2100: 2098: 2096: 2094: 2092: 2090: 2088: 1880: 1867: 1849: 1836: 1829: 1819: 1810: 1797: 1791: 1770: 1764: 1744: 1720: 1695: 1689: 1668: 1662: 1642: 109:Learn how and when to remove this message 1715:) refer to the share of electors giving 1397: 1229: 1117: 2673:Independence of irrelevant alternatives 2451:Sequential proportional approval voting 2050: 1408: 136: 2070: 1338:For each candidate, we determine the 7: 1966:(as well as being almost-everywhere 1637:Say the median grade of a candidate 47:adding citations to reliable sources 2483:Indirect single transferable voting 1380:, and also guarantees continuity. 14: 2188:Leray, Marjolaine; Hogg, Carol. 2008: 1013: 1000: 988: 936:McKelvey–Schofield chaos theorem 582:Semi-proportional representation 214:First preference plurality (FPP) 23: 2838:Single-winner electoral systems 34:needs additional citations for 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Link. 2123:10.1007/s00355-020-01269-9 1919: 1104: 1087:highest median voting rule 833:Multiple districts paradox 564:Fractional approval voting 552:Interactive representation 2808: 2800:Voting systems by country 2703:Mutual majority criterion 2658:Condorcet loser criterion 2604:Vote linkage mixed system 2516:Largest remainders method 2243: 2164:"Le jugement majoritaire" 2111:Social Choice and Welfare 2058:Jennings, Andrew (2010). 1911:Properties and advantages 1559: 1499: 1439: 780:Paradoxes and pathologies 629:Mixed-member proportional 624:Mixed-member majoritarian 619:By results of combination 510:Approval-based committees 2693:Majority loser criterion 2579:Additional member system 2537:Hagenbach-Bischoff quota 2456:Single transferable vote 2381:Positional voting system 2317:Minimax Condorcet method 2275:Combined approval voting 959:Condorcet's jury theorem 760:Double simultaneous vote 735:Rural–urban proportional 730:Dual-member proportional 692: 681: 648:Parallel (superposition) 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200:Single-winner methods 152: 2733:Seats-to-votes ratio 2504:Webster/Sainte-LaguĂ« 1942:arbitrarily badly). 1790: 1763: 1743: 1719: 1688: 1661: 1641: 1633:Mathematical formula 1007:Economics portal 954:Median voter theorem 173:Comparative politics 43:improve this article 2713:Plurality criterion 2312:Kemeny–Young method 1964:continuous function 1938:, and can fail the 995:Politics portal 706:Vote linkage system 677:Seat linkage system 264:Ranked-choice (RCV) 2754:Election threshold 2688:Majority criterion 2364:Supplementary vote 2016:Mathematics portal 1940:majority criterion 1889: 1776: 1749: 1725: 1701: 1674: 1647: 1404: 1357:its median grade. 891:Discursive dilemma 850:Lesser evil voting 725:Supermixed systems 428:Largest remainders 286:Round-robin voting 154: 2825: 2824: 2723:Reversal symmetry 2632:Cumulative voting 2614:Semi-proportional 2589:Mixed single vote 2555: 2554: 2431:Mixed single vote 2339:Exhaustive ballot 2302:Copeland's method 2297:Condorcet methods 2237:Electoral 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2459: 2458: 2457: 2454: 2452: 2449: 2447: 2444: 2442: 2439: 2437: 2434: 2432: 2429: 2427: 2424: 2423: 2421: 2417: 2414: 2412: 2408: 2402: 2399: 2397: 2394: 2392: 2389: 2387: 2384: 2382: 2379: 2377: 2374: 2372: 2369: 2365: 2362: 2360: 2357: 2355: 2352: 2351: 2350: 2347: 2345: 2342: 2340: 2337: 2333: 2330: 2328: 2325: 2323: 2320: 2318: 2315: 2313: 2310: 2308: 2305: 2303: 2300: 2299: 2298: 2295: 2293: 2290: 2288: 2285: 2281: 2278: 2276: 2273: 2272: 2271: 2268: 2267: 2265: 2263: 2262:Single-winner 2259: 2255: 2253: 2249: 2242: 2238: 2231: 2226: 2224: 2219: 2217: 2212: 2211: 2208: 2198: 2191: 2184: 2181: 2169: 2165: 2159: 2156: 2151: 2147: 2140: 2137: 2132: 2128: 2124: 2120: 2116: 2112: 2108: 2101: 2099: 2097: 2095: 2093: 2091: 2089: 2085: 2080: 2074: 2063: 2062: 2054: 2051: 2045: 2041: 2038: 2036: 2033: 2031: 2028: 2025: 2022: 2021: 2017: 2011: 2006: 2001: 1999: 1997: 1993: 1989: 1988:ranked voting 1981: 1979: 1975: 1973: 1972:discontinuous 1969: 1965: 1957: 1955: 1953: 1945: 1943: 1941: 1937: 1933: 1929: 1923: 1915: 1910: 1908: 1901: 1899: 1881: 1877: 1873: 1868: 1864: 1860: 1857: 1850: 1846: 1842: 1837: 1833: 1824: 1821: 1816: 1811: 1807: 1803: 1798: 1794: 1771: 1767: 1746: 1738: 1722: 1714: 1696: 1692: 1669: 1665: 1644: 1632: 1630: 1623: 1621: 1612: 1609: 1607: 1604: 1601: 1598: 1595: 1592: 1591: 1587: 1584: 1581: 1578: 1575: 1572: 1569: 1567: 1565: 1564:Running total 1558: 1554: 1551: 1548: 1546: 1543: 1541: 1538: 1535: 1532: 1531: 1527: 1524: 1521: 1518: 1515: 1512: 1509: 1507: 1505: 1504:Running total 1498: 1494: 1491: 1488: 1486: 1483: 1481: 1478: 1475: 1472: 1471: 1467: 1464: 1461: 1458: 1455: 1452: 1449: 1447: 1445: 1444:Running total 1438: 1434: 1431: 1428: 1425: 1422: 1419: 1416: 1407: 1400: 1396: 1390: 1388: 1386: 1381: 1379: 1375: 1367: 1365: 1363: 1358: 1356: 1352: 1347: 1343: 1342: 1331: 1328: 1325: 1322: 1319: 1316: 1313: 1310: 1309: 1305: 1302: 1299: 1296: 1293: 1290: 1287: 1284: 1283: 1279: 1276: 1273: 1270: 1267: 1264: 1261: 1258: 1257: 1253: 1250: 1247: 1244: 1241: 1238: 1235: 1232: 1231: 1228: 1221: 1219: 1217: 1214: 1212: 1210: 1208: 1205: 1204: 1201: 1198: 1196: 1194: 1192: 1190: 1188: 1185: 1184: 1181: 1179: 1177: 1175: 1173: 1171: 1168: 1165: 1164: 1160: 1158: 1156: 1154: 1152: 1150: 1148: 1145: 1144: 1140: 1137: 1134: 1131: 1128: 1125: 1122: 1120: 1119: 1116: 1114: 1108: 1100: 1098: 1094: 1092: 1088: 1083: 1081: 1077: 1073: 1069: 1068: 1062: 1058: 1047: 1042: 1040: 1035: 1033: 1028: 1027: 1025: 1024: 1021: 1016: 1008: 1003: 998: 996: 991: 986: 985: 983: 982: 975: 972: 970: 967: 965: 964:May's theorem 962: 960: 957: 955: 952: 951: 950: 949: 942: 939: 937: 934: 932: 929: 927: 924: 922: 919: 918: 917: 916: 910: 905: 904: 897: 894: 892: 889: 887: 884: 882: 879: 878: 877: 876: 875: 874:majority rule 872:Paradoxes of 866: 863: 861: 858: 856: 853: 851: 848: 847: 846: 845: 844: 834: 831: 830: 829: 826: 824: 821: 819: 816: 815: 814: 813: 806: 803: 801: 798: 796: 793: 791: 788: 787: 786: 781: 776: 775: 768: 765: 761: 758: 757: 756: 753: 752: 751: 750: 741: 738: 736: 733: 731: 728: 727: 726: 723: 717: 714: 712: 709: 708: 707: 704: 700: 695: 691: 689: 684: 680: 679: 678: 675: 674: 673: 672: 668: 664: 661: 659: 656: 654: 651: 649: 646: 645: 644: 643: 638: 637: 636: 630: 627: 625: 622: 621: 620: 615: 614:Mixed systems 610: 609: 602: 599: 595: 592: 591: 590: 587: 586: 585: 584: 583: 575: 574:Random ballot 572: 570: 567: 565: 562: 558: 555: 553: 550: 549: 548: 545: 544: 543: 542: 541: 533: 530: 528: 525: 523: 520: 518: 515: 514: 513: 512: 511: 503: 500: 498: 495: 493: 490: 488: 485: 484: 483: 482: 481: 471: 468: 466: 463: 461: 458: 456: 453: 451: 448: 447: 446: 443: 439: 436: 434: 431: 429: 426: 424: 421: 420: 419: 418:Apportionment 416: 415: 414: 413: 407: 402: 401: 394: 391: 389: 386: 384: 381: 379: 376: 375: 374: 373: 372: 363: 359: 354: 353:Antiplurality 351: 348: 344: 339: 336: 333: 329: 324: 321: 320: 319: 318: 317: 307: 304: 302: 299: 297: 294: 292: 289: 288: 287: 284: 282: 281:Condorcet-IRV 279: 278: 277: 276: 275: 265: 260: 256: 254: 249: 245: 244: 243: 240: 236: 233: 232: 230: 225: 220: 217: 215: 212: 211: 210: 208: 201: 196: 195: 188: 184: 181: 179: 176: 174: 171: 169: 166: 164: 163:Social choice 161: 160: 158: 157: 151: 147: 146: 143: 139: 138:Social choice 135: 131: 127: 123: 122: 113: 110: 102: 91: 88: 84: 81: 77: 74: 70: 67: 63: 60: â€“  59: 55: 54:Find sources: 48: 44: 38: 37: 32:This article 30: 26: 21: 20: 2816: 2810: 2426:Mixed-member 2411:Proportional 2400: 2386:Score voting 2327:Ranked pairs 2246:Part of the 2245: 2196: 2183: 2172:. Retrieved 2167: 2158: 2149: 2139: 2114: 2110: 2060: 2053: 2040:Range voting 1995: 1985: 1976: 1961: 1949: 1925: 1905: 1736: 1712: 1636: 1627: 1624:Race analogy 1618: 1605: 1561: 1544: 1539: 1501: 1484: 1479: 1441: 1394: 1382: 1374:line-drawing 1371: 1368:Tie-breaking 1359: 1354: 1350: 1345: 1339: 1337: 1226: 1206:Candidate D 1186:Candidate C 1166:Candidate B 1146:Candidate A 1110: 1095: 1084: 1079: 1064: 1060: 1056: 1055: 947: 946: 913: 871: 870: 855:Exaggeration 841: 840: 811: 810: 784: 748: 747: 716:Mixed ballot 671:Compensatory 669: 642:compensatory 639: 634: 618: 580: 579: 538: 537: 508: 507: 478: 477: 465:List-free PR 410: 378:Score voting 369: 368: 314: 313: 301:Ranked pairs 272: 271: 204: 105: 99:January 2024 96: 86: 79: 72: 65: 53: 41:Please help 36:verification 33: 2769:Spoilt vote 2532:Droop quota 2471:Schulze STV 2446:Rural–urban 2391:STAR voting 2287:Borda count 2170:(in French) 2117:: 101–124. 1248:Acceptable 1135:Acceptable 1065:continuous 755:Single vote 658:Conditional 653:Coexistence 502:Quota Borda 492:Schulze STV 450:Closed list 393:STAR voting 338:Borda count 2788:Comparison 2542:Hare quota 2492:Allocation 2478:Spare vote 2466:Hare-Clark 2436:Party-list 2174:2021-02-08 2046:References 1958:Continuity 1759:, written 1713:proponents 1254:Excellent 1242:Tolerable 1233:Candidate 1141:Excellent 1129:Tolerable 860:Truncation 589:Cumulative 412:Party-list 187:By country 178:Comparison 69:newspapers 2779:Unseating 2774:Sortition 2376:Plurality 2252:Economics 2131:226196615 2073:cite book 1982:Rare ties 1874:− 1861:− 1843:− 1808:α 1737:opponents 1666:α 1413:Candidate 767:Dual-vote 460:Panachage 455:Open list 445:List type 323:Plurality 219:Two-round 207:plurality 130:Economics 2832:Category 2646:Criteria 2599:Scorporo 2248:politics 2002:See also 1930:such as 1351:at least 1346:majority 1245:Neutral 1132:Neutral 1113:cardinal 1085:It is a 487:Hare STV 126:Politics 124:A joint 2818:Project 2509:D'Hondt 2461:CPO-STV 2419:Systems 1391:Example 1355:at most 497:CPO-STV 347:Baldwin 296:Schulze 291:Minimax 209:methods 83:scholar 2812:Portal 2749:Ballot 2525:Quotas 2254:series 2129:  1990:, and 1629:vote. 1341:median 1236:Awful 1123:Awful 362:Coombs 132:series 85:  78:  71:  64:  56:  2742:Other 2561:Mixed 2193:(PDF) 2127:S2CID 2065:(PDF) 1996:every 1613:100% 1555:100% 1495:100% 1410:Grade 1251:Good 1138:Good 699:'MMP' 688:'AMS' 90:JSTOR 76:books 2250:and 2079:link 1610:75% 1602:35% 1599:20% 1596:10% 1588:25% 1585:25% 1582:15% 1579:15% 1576:10% 1552:76% 1549:64% 1536:19% 1528:24% 1525:12% 1522:13% 1519:13% 1516:19% 1513:17% 1492:85% 1489:68% 1476:17% 1468:15% 1465:18% 1459:20% 1456:21% 1453:15% 1332:25% 1329:25% 1326:15% 1323:15% 1320:10% 1306:24% 1303:12% 1300:13% 1297:13% 1294:19% 1291:17% 1280:15% 1277:18% 1271:20% 1268:21% 1265:15% 1239:Bad 1126:Bad 640:Non- 594:SNTV 183:List 140:and 128:and 62:news 2574:MMP 2119:doi 1739:of 1657:is 1606:50% 1593:1% 1573:9% 1570:1% 1545:51% 1540:38% 1533:2% 1510:2% 1485:58% 1480:39% 1473:2% 1462:9% 1450:2% 1344:or 1317:9% 1314:1% 1288:2% 1274:9% 1262:2% 1063:or 358:el. 343:el. 332:IRV 328:el. 45:by 2834:: 2815:— 2195:. 2166:. 2148:. 2125:. 2115:56 2113:. 2109:. 2087:^ 2075:}} 2071:{{ 1954:. 1566:) 1560:C 1506:) 1500:B 1446:) 1440:A 1435:6 1432:5 1429:4 1426:3 1423:2 1420:1 1417:0 1311:C 1285:B 1259:A 1215:X 1199:X 1169:X 1161:X 694:NZ 683:UK 259:US 248:UK 231:) 224:US 2229:e 2222:t 2215:v 2199:. 2177:. 2152:. 2150:X 2121:: 2081:) 1882:c 1878:q 1869:c 1865:p 1858:1 1851:c 1847:q 1838:c 1834:p 1825:2 1822:1 1817:+ 1812:c 1804:= 1799:c 1795:n 1772:c 1768:q 1747:c 1723:c 1697:c 1693:p 1670:c 1645:c 1562:( 1502:( 1442:( 1045:e 1038:t 1031:v 696:: 685:: 364:) 355:( 349:) 340:( 334:) 325:( 261:: 250:: 226:: 221:( 189:) 185:( 112:) 106:( 101:) 97:( 87:· 80:· 73:· 66:· 39:.

Index


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"Graduated majority judgment"
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Politics
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Social choice
Mechanism design
Comparative politics
Comparison
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Single-winner methods
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Two-round
US
Jungle primary
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Instant-runoff

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