DDC Dataset Statistics

Last updated: 2026-09-18 15:12:51 (UTC+8)

This is a repository for the statistics of the DDC dataset. The statistics are autoly generated by the github action every three days.

Statistics

DDC data distribution

DDC that already having 50 samples will not show details of the distribution.

Vaild samples number in total: 276488

DDC number that not satisfy the requirement of 50 samples have: 242

DDC nodes that satisfy the requirement of 50 samples: 733

DDC grouped by 10 (count of DDC < 50):

DDC Range	DDC < 50 Count	DDC List
000-007	1	000
010-019	2	013, 014
020-029	2	024, 029
030-039	7	030, 034, 035, 036, 037, 038, 039
050-059	7	050, 053, 054, 055, 056, 057, 058
060-069	6	060, 061, 062, 063, 065, 067
070-079	9	071, 072, 073, 074, 075, 076, 077, 078, 079
080-089	10	080, 081, 082, 083, 084, 085, 086, 087, 088, 089
090-099	7	090, 093, 094, 095, 096, 097, 099
100-109	2	100, 104
110-119	2	118, 119
120-129	2	125, 127
130-139	2	134, 137
140-149	3	143, 145, 148
150-159	4	151, 156, 157, 159
160-169	9	160, 162, 163, 164, 165, 166, 167, 168, 169
170-179	4	173, 176, 177, 178
180-189	8	180, 182, 183, 184, 185, 186, 187, 189
190-199	2	197, 199
210-219	4	216, 217, 218, 219
220-229	4	220, 221, 222, 225
230-239	1	237
270-279	1	278
280-289	1	288
290-299	2	290, 298
310-319	3	311, 313, 318
390-399	3	396, 397, 399
430-439	2	432, 435
440-449	2	441, 449
450-459	4	455, 457, 458, 459
460-469	5	461, 462, 465, 467, 468
470-479	3	472, 475, 478
480-489	6	480, 481, 483, 485, 487, 488
490-499	7	491, 493, 494, 496, 497, 498, 499
520-529	1	527
540-549	1	545
550-559	1	553
580-589	1	586
600-609	1	606
620-629	1	626
650-659	1	655
670-679	2	675, 679
680-689	3	680, 681, 689
690-699	1	699
710-719	7	710, 713, 714, 715, 716, 718, 719
730-739	1	734
740-749	1	742
750-759	3	753, 754, 756
760-769	7	762, 763, 764, 765, 766, 767, 768
770-779	3	772, 773, 774
780-789	2	785, 789
800-809	4	803, 805, 806, 807
810-819	2	816, 817
820-829	3	824, 826, 827
830-839	8	830, 831, 832, 834, 835, 837, 838, 839
840-849	6	842, 844, 846, 847, 848, 849
850-859	7	850, 853, 854, 855, 856, 857, 859
860-869	7	861, 862, 864, 865, 866, 867, 868
870-879	8	870, 871, 873, 874, 875, 876, 877, 878
880-889	8	881, 882, 884, 885, 886, 887, 888, 889
890-899	6	890, 893, 894, 896, 897, 899
900-909	3	905, 906, 908
920-929	3	924, 925, 926
960-969	1	969
990-999	2	991, 999

DDC number that not satisfy the requirement of 50 samples:

DDC	Sample Number
035	30
036	30
037	30
038	30
039	30
050	30
053	30
056	30
057	30
058	30
062	30
063	30
073	30
075	30
078	30
079	30
083	30
088	30
090	30
094	30
095	30
096	30
097	30
163	30
164	30
165	30
167	30
168	30
173	30
176	30
182	30
183	30
185	30
187	30
216	30
217	30
221	30
288	30
298	30
313	30
459	30
461	30
467	30
472	30
478	30
485	30
487	30
493	30
499	30
527	30
553	30
606	30
679	30
734	30
754	30
765	30
766	30
767	30
785	30
803	30
806	30
807	30
817	30
826	30
830	30
832	30
835	30
837	30
844	30
846	30
847	30
849	30
855	30
856	30
862	30
864	30
868	30
873	30
876	30
878	30
884	30
888	30
893	30
894	30
065	31
076	31
093	31
118	31
145	31
189	31
199	31
219	31
237	31
458	31
488	31
719	31
834	31
838	31
870	31
875	31
897	31
127	32
159	32
225	32
435	32
494	32
762	32
831	32
861	32
134	33
184	33
865	33
866	33
000	34
716	34
764	34
842	34
871	34
082	35
089	35
100	35
626	35
756	35
854	35
857	35
014	36
085	36
197	36
397	36
462	36
675	36
882	36
906	36
157	37
178	37
186	37
468	37
481	37
713	37
867	37
084	38
156	38
169	38
441	38
457	38
710	38
715	38
848	38
086	39
148	39
768	39
816	39
881	39
885	39
013	40
072	40
104	40
162	40
220	40
483	40
718	40
772	40
926	40
999	40
024	41
166	41
177	41
222	41
742	41
763	41
029	42
071	42
081	42
099	42
151	42
160	42
218	42
290	42
449	42
545	42
877	42
886	42
034	43
119	43
137	43
143	43
432	43
498	43
655	43
827	43
908	43
318	44
399	44
680	44
681	44
714	44
753	44
824	44
839	44
850	44
896	44
180	45
480	45
491	45
497	45
773	45
889	45
054	46
077	46
278	46
586	46
805	46
887	46
991	46
067	47
080	47
465	47
475	47
774	47
789	47
859	47
874	47
905	47
030	48
055	48
061	48
087	48
125	48
455	48
496	48
689	48
699	48
890	48
925	48
060	49
074	49
311	49
396	49
853	49
899	49
924	49
969	49

DDC data quality

Garbled text and AI-generated content by DDC group:

DDC Range	Total Records	Garbled Records	Garbled Ratio	Clean Records	AI Records	AI Ratio
000-007	7200	7	0.10%	7193	1	0.01%
010-019	766	6	0.78%	760	0	0.00%
020-029	1013	19	1.88%	994	0	0.00%
030-039	490	10	2.04%	480	82	16.73%
050-059	457	4	0.88%	453	199	43.54%
060-069	493	10	2.03%	483	98	19.88%
070-079	694	3	0.43%	691	150	21.61%
080-089	380	0	0.00%	380	85	22.37%
090-099	429	3	0.70%	426	139	32.40%
100-109	854	14	1.64%	840	0	0.00%
110-119	1053	23	2.18%	1030	3	0.28%
120-129	1402	49	3.50%	1353	0	0.00%
130-139	1086	22	2.03%	1064	30	2.76%
140-149	1060	28	2.64%	1032	0	0.00%
150-159	6471	13	0.20%	6458	0	0.00%
160-169	405	5	1.23%	400	80	19.75%
170-179	671	0	0.00%	671	56	8.35%
180-189	480	1	0.21%	479	55	11.46%
190-199	466	0	0.00%	466	1	0.21%
200-209	1901	48	2.52%	1853	0	0.00%
210-219	1050	17	1.62%	1033	24	2.29%
220-229	1261	14	1.11%	1247	5	0.40%
230-239	1473	13	0.88%	1460	0	0.00%
240-249	1057	2	0.19%	1055	0	0.00%
250-259	1000	13	1.30%	987	0	0.00%
260-269	1120	22	1.96%	1098	0	0.00%
270-279	1018	25	2.46%	993	0	0.00%
280-289	958	25	2.61%	933	8	0.84%
290-299	1440	13	0.90%	1427	6	0.42%
300-309	4859	12	0.25%	4847	0	0.00%
310-319	796	11	1.38%	785	6	0.75%
320-329	19789	23	0.12%	19766	0	0.00%
330-339	30775	21	0.07%	30754	0	0.00%
340-349	5435	42	0.77%	5393	0	0.00%
350-359	9204	38	0.41%	9166	0	0.00%
360-369	2843	29	1.02%	2814	0	0.00%
370-379	2850	30	1.05%	2820	0	0.00%
380-389	2645	24	0.91%	2621	0	0.00%
390-399	1311	19	1.45%	1292	79	6.03%
400-409	1151	20	1.74%	1131	0	0.00%
410-419	1824	1	0.05%	1823	0	0.00%
420-429	1680	11	0.65%	1669	0	0.00%
430-439	626	3	0.48%	623	0	0.00%
440-449	810	5	0.62%	805	0	0.00%
450-459	556	2	0.36%	554	94	16.91%
460-469	624	3	0.48%	621	159	25.48%
470-479	479	2	0.42%	477	62	12.94%
480-489	419	1	0.24%	418	48	11.46%
490-499	478	0	0.00%	478	96	20.08%
500-509	12395	15	0.12%	12380	0	0.00%
510-519	2499	24	0.96%	2475	0	0.00%
520-529	4312	21	0.49%	4291	2	0.05%
530-539	1758	23	1.31%	1735	0	0.00%
540-549	1284	16	1.25%	1268	0	0.00%
550-559	1593	5	0.31%	1588	12	0.75%
560-569	1290	13	1.01%	1277	0	0.00%
570-579	11834	11	0.09%	11823	0	0.00%
580-589	1185	0	0.00%	1185	34	2.87%
590-599	1474	1	0.07%	1473	0	0.00%
600-609	958	17	1.77%	941	22	2.30%
610-619	14690	8	0.05%	14682	0	0.00%
620-629	12498	7	0.06%	12491	26	0.21%
630-639	1657	10	0.60%	1647	0	0.00%
650-659	5746	9	0.16%	5737	0	0.00%
670-679	1052	0	0.00%	1052	2	0.19%
680-689	1154	0	0.00%	1154	62	5.37%
690-699	1158	3	0.26%	1155	35	3.02%
700-709	2614	28	1.07%	2586	0	0.00%
710-719	766	14	1.83%	752	25	3.26%
720-729	2012	14	0.70%	1998	0	0.00%
730-739	1272	14	1.10%	1258	2	0.16%
740-749	2341	23	0.98%	2318	0	0.00%
750-759	1351	9	0.67%	1342	33	2.44%
760-769	524	7	1.34%	517	50	9.54%
770-779	1463	27	1.85%	1436	59	4.03%
780-789	1900	24	1.26%	1876	2	0.11%
790-799	30772	72	0.23%	30700	0	0.00%
800-809	2858	4	0.14%	2854	44	1.54%
810-819	1622	4	0.25%	1618	9	0.55%
820-829	2652	2	0.08%	2650	2	0.08%
830-839	373	1	0.27%	372	90	24.13%
840-849	435	0	0.00%	435	129	29.66%
850-859	455	0	0.00%	455	155	34.07%
860-869	399	0	0.00%	399	169	42.36%
870-879	437	0	0.00%	437	127	29.06%
880-889	422	1	0.24%	421	109	25.83%
890-899	696	5	0.72%	691	94	13.51%
910-919	1201	2	0.17%	1199	0	0.00%
920-929	694	1	0.14%	693	29	4.18%
930-939	1581	1	0.06%	1580	0	0.00%
950-959	1996	3	0.15%	1993	0	0.00%
960-969	1078	1	0.09%	1077	0	0.00%
970-979	1759	1	0.06%	1758	0	0.00%
980-989	846	1	0.12%	845	0	0.00%
990-999	836	0	0.00%	836	33	3.95%

Minimal length of description: 15

Maximal length of description: 1286

Average length of description: 97.79