User:LA2/ISBN stats 2007

This pages started out as a section of user:LA2/Extraktor stats 200709.

A selection of north European languages are measured.

Somewhere between 1 and 2 percent of all ISBNs in Wikipedia tend to be outright bad. Apparently, nobody is watching this, since a small manual effort could correct the problem.

Even when the ISBN looks good, it could of course be an ISBN for another book, or the book might be a bad reference source. And a lot of articles lack sources. But that is a much larger problem, that isn't addressed here.

Some ISBNs use spaces where hyphens are recommended, or put the hyphens in the wrong places, or just write 10 digits without any separation. These errors account for one third of all ISBNs in Wikipedia. The error is entirely cosmetic, and doesn't change the usefulness of the ISBN links. Automatic software (based on CPAN Perl module Business::ISBN) can detect these cases and suggest improvements. A bot could handle that.

Download	Unique ISBNs	Unique article ISBNs^[1]		Total ISBNs	OK		Bad hyphens	Bad checksum^[2]	Bad number	Comment / Frequent errors
Download	Unique ISBNs	Unique article ISBNs^[1]		Total ISBNs	OK		Could be made prettier	Should be fixed		Comment / Frequent errors
Czech
cswiki-20071111	4620	7773	2.5%	7964	6850	86.0%	917	95	102	23× ISBN 3871503655, 9× ISBN 3543166, 6× ISBN 230758701
Danish
dawiki-20070905	3117	3844	2.3%	3931	2730	69.4%	1131	38	32	2 ISBN 091834635, 2 ISBN 04150255273
dawiki-20070923	3273	4050	2.5%	4150	2852	68.7%	1222	40	36	2× ISBN 978-87-23-02421-6, 2× ISBN 89-601-6921-4, 2× ISBN 87-982957-8-3, 2× ISBN 8791822377, 2× ISBN 091834635, 2× ISBN 0-415-025527-3, 2× ISBN 0080249041
dawiki-20071009	3376	4179	2.3%	4276	4174	97.6%	67^[3]	23	12	2× ISBN 8960169214, 2× ISBN 04150255273, 2× ISBN 0080249041
dawiki-20071111	3594	4524	2.2%	4624	4541	98.2%	72	8	3	2× ISBN 0080249041, 1× ISBN 978142620089, 1× ISBN 8757670235
German
dewiki-20070922	155727	234809	1.8%	239123	172715	72.2%	65941	278	189	9× ISBN 3632038942, 8× ISBN 3806729144, 4× ISBN 3598240217
dewiki-20071009	158233	239249	1.8%	243645	178352	73.2%	64772	294	227	10× ISBN 32750089191, 8× ISBN 3806729144, 4× ISBN 3910173044
English
enwiki-20070908	197327	330714	5.8%	349816	267262	76.4%	77603	2657	2294	66× ISBN 00006388981, 61× ISBN 854670548, 52× ISBN 1859831012
enwiki-20071018	206779	349833	6.0%	370796	276743	74.6%	88698	2900	2455	61× ISBN 854670548, 41× ISBN 9137087251, 32× ISBN 9958089028
Estonian
etwiki-20070826	849	912	1.5%	926	131	14.1%	770	11	14	7 ISBN 123456789 (apparently an example)
etwiki-20070909	871	938	1.7%	954	139	14.6%	790	11	14	These changes are before my corrections
etwiki-20070927	896	962	0.9%	971	148	15.2%	806	9	8	1× ISBN 019825437X, 1× ISBN 207037797, 1× ISBN 3884769423,
etwiki-20071012	914	983	0.9%	992	962	97.0%	13^[3]	9	8	1× ISBN 9985968734, 1× ISBN 9985886292, 1× ISBN 9985634505
etwiki-20071117	956	1029	1.0%	1039	1012	97.4%	21	3	3	2× ISBN 9985, 1× ISBN 9985886292, 1× ISBN 5460005288
Võro
fiu_vrowiki-20070903	0	0	-	0	-	-	-	-	-
fiu_vrowiki-20070921	0	0	0.0%	0	0	0.0%	0	0	0
fiu_vrowiki-20071102	8	8	12.5%	9	8	88.9%	1	0	0
Finnish
fiwiki-20070828	7657	13389	12.8%	15108	12445	82.4%	2201	172	290	52 ISBN 08785810730 (a book referenced in many articles, should be 07858...), 26 ISBN 01401 (a book referenced in many articles, happened to have a period in the ISBN), 10 ISBN 951, 8 ISBN 952 (long ndash – was used instead of ASCII hyphen in 22 places in 6 articles), 7 ISBN 95110927166, 6 ISBN 95193810203, 4 ISBN 978952919576, 4 ISBN 978, 4 ISBN 07835892, 4 ISBN 0356665X (the last two might be ISSNs)
fiwiki-20070912	7816	13757	13.2%	15578	12981	83.3%	2225	185	187	30 951-26-0950-7, 11 951-31-2507-8, 7 951-109-2716-6, 6 951-9381-02-03, 6 3449501236, 5 951-1952-74-1, 5 951-0-19113-3
fiwiki-20070928	8062	14288	13.6%	16235	13663	84.2%	2261	146	165	11× ISBN 9513125078, 7× ISBN 95110927166, 6× ISBN 3449501236
fiwiki-20071013	8336	14843	14.0%	16926	14448	85.4%	2150	152	176	11× ISBN 9513125078, 7× ISBN 95110927166, 6× ISBN 3449501236
fiwiki-20071119	8918	15962	10.5%	17641	16438	93.2%	916	172	115	8× ISBN 9510224846, 6× ISBN 3449501236, 5× ISBN 9521113917
Faroese
fowiki-20070903	28	29	3.4%	30	28	93.3%	-	1	1
fowiki-20070921	28	29	3.4%	30	29	96.7%	-	-	1	1× ISBN 99918-49 (fo:Fannir)
fowiki-20071007	30	31	3.2%	32	30	93.8%	1	0	1	1× ISBN 9991849
fowiki-20071102	29	30	3.3%	31	31	100.0%	0	0	0
Frisian
fywiki-20071007	68	69	0.0%	69	35	50.7%	32	2	0	1× ISBN 9074323891, 1× ISBN 9065500929
fywiki-20071103	89	91	0.0%	91	80	87.9%	11	0	0
Icelandic
iswiki-20070905	505	631	1.3%	639	185	29.0%	434	1	19	7 ISBN 838253, 4 ISBN 997921306, 2 ISBN 123456789
iswiki-20070922	517	662	1.2%	670	210	31.3%	448	1	11	7× ISBN 838253 (is:Rómversk-kaþólska kirkjan)
iswiki-20071009	518	663	0.9%	669	655	97.9%	5^[3]	1	8	4× ISBN 838253, 1× ISBN 87020172455, 1× ISBN 459284723
iswiki-20071110	523	668	0.9%	674	655	97.2%	10	1	8	4× ISBN 838253, 1× ISBN 87020172455, 1× ISBN 459284723
Lithuanian
ltwiki-20070828	668	751	2.8%	772	548	71.0%	203	9	12	2 ISBN 202009679
ltwiki-20070912	673	761	2.8%	782	574	73.4%	205	2	1	9987-443-12-5 in lt:Jurgis Elisonas has bad checksum in LIBIS too.
ltwiki-20070928	683	774	2.6%	794	703	88.5%	87	3	1	1× ISBN 9987443121, 1× ISBN 5415008877, 1× ISBN 283160521
ltwiki-20071013	738	840	2.4%	860	837	97.3%	19	3	1	1× ISBN 9987443121, 1× ISBN 5415008877, 1× ISBN 283160521
ltwiki-20071119	781	909	2.4%	931	920	98.8%	5	5	1	1× ISBN 9987443121, 1× ISBN 5888340360, 1× ISBN 5415008877
Latvian
lvwiki-20070823	89	122	1.6%	124	97	78.2%	25	1	1
lvwiki-20070923	92	125	1.6%	127	99	78.0%	26	1	1
lvwiki-20071010	95	128	1.6%	130	128	98.5%	0	1	1	1× ISBN 9187711406, 1× ISBN 38039007000
lvwiki-20071113	100	134	1.5%	136	133	97.8%	1	1	1	1× ISBN 9187711406, 1× ISBN 38039007000
Dutch
nlwiki-20071006	9518	13456	1.8%	13702	6209	45.3%	7111	208	174	16× ISBN 903660348, 15× ISBN 0213110138, 10× ISBN 9063782399
nlwiki-20071104	10033	14183	2.4%	14519	6638	45.7%	7474	239	168	53× ISBN 9029240013, 16× ISBN 903660348, 12× ISBN 9063782399
Norwegian (nynorsk)
nnwiki-20070825	1197	1343	1.4%	1362	906	66.5%	438	9	9	2 ISBN 38039007000
nnwiki-20070924	1258	1410	1.3%	1429	952	66.6%	459	9	9	2× ISBN 38039007000
nnwiki-20071011	1275	1430	1.1%	1446	1417	98.0%	27^[3]	0	2	1× ISBN 222, 1× ISBN 111
nnwiki-20071114	1349	1517	1.1%	1533	1521	99.2%	9	0	3	1× ISBN 222, 1× ISBN 111, 1× ISBN 100861404564
Norwegian (bokmål)
nowiki-20070829	7323	9477	3.0%	9762	6408	65.6%	3161	104	89	2 ISBN 15881125143, 2 ISBN 081560116, 2 ISBN 014101383
nowiki-20070915	7537	9814	3.1%	10115	6685	66.1%	3280	87	63	2× ISBN 8283200165, 2× ISBN 8280349017, 2× ISBN 8277230259
nowiki-20070930	7631	9997	3.1%	10303	7057	68.5%	3187	40	19	2× ISBN 8280349017, 2× ISBN 8202039166, 2× ISBN 8090110538
nowiki-20071019	8008	10516	3.0%	10829	10141	93.6%	657^[3]	20	11	2× ISBN 8202039166, 2× ISBN 8090110538, 2× ISBN 012345678X
nowiki-20071127	8458	11268	3.1%	11616	11442	98.5%	132	24	18	4× ISBN 829913007, 2× ISBN 9788203191975, 2× ISBN 8829230143
Polish
plwiki-20071002	10731	19917	3.2%	20563	13904	67.6%	6045	363	251	56× ISBN 8389648358, 20× ISBN 0878397990, 16× ISBN 8382017439
plwiki-20071021	11474	21388	3.2%	22063	17005	77.1%	4463	331	264	20× ISBN 0878397990, 16× ISBN 8382017439, 12× ISBN 839033890041
plwiki-20071129	12516	23963	3.4%	24779	20898	84.3%	3247	354	280	16× ISBN 8382017439, 12× ISBN 839033890041, 12× ISBN 838670350
Russian
ruwiki-20070920	8613	12011	4.4%	12544	9059	72.2%	2911	281	293	19× ISBN 985, 15× ISBN 9667007604, 15× ISBN 575111930X
ruwiki-20071008	9049	12704	4.3%	13253	9790	73.9%	2971	301	191	15× ISBN 9667007604, 15× ISBN 575111930X, 15× ISBN 5420005833
ruwiki-20071107	9610	13613	4.4%	14215	12961	91.2%	692^[3]	348	214	43× ISBN 5289016868, 15× ISBN 9667007604, 15× ISBN 575111930X
Sami
sewiki-20070826	6	7	0.0%	7	7	100.0%	-	-	-
sewiki-20070909	6	7	0.0%	7	7	100.0%	-	-	-
sewiki-20070927	6	7	0.0%	7	7	100.0%	0	0	0
sewiki-20071012	6	7	0.0%	7	7	100.0%	0	0	0
sewiki-20071116	6	7	0.0%	7	7	100.0%	0	0	0
Swedish
svwiki-20070831	6604	10322	4.2%	10754	7511	69.8%	3045	129	69	10 ISBN 91701841443, 3 ISBN 910405884, 3 ISBN 4704974X, 2 ISBN 19163199092, 2 ISBN 139780540082421
svwiki-20070918	6980	10906	4.5%	11398	8255	72.4%	3068	69	6	3× ISBN 978-91-7073-223-3, 2x ISBN 9189447998, 2x ISBN 9171196388, 2x ISBN 9146201670, 2x ISBN 9100469292, 2x ISBN 0873403194, 2x ISBN 0226169231, 2x ISBN 0197191574, 2x ISBN 0081496004
svwiki-20071001	7543	11627	2.8%	11954	9054	75.7%	2824	58	18	2× ISBN 9189447998, 2× ISBN 9171196388, 2× ISBN 9100469292
svwiki-20071020	7900	12130	3.0%	12496	12304	98.5%	112^[3]	71	9	2× ISBN 9844830679, 2× ISBN 9189447998, 2× ISBN 9171196388
svwiki-20071128	8554	12719	3.1%	13115	12808	97.7%	208	82	17	6× ISBN 01313110999, 2× ISBN 9914504906, 2× ISBN 9900205316
Yiddish
yiwiki-20070829	1	1	0.0%	1	1	100.0%	-	-	-
yiwiki-20070921	1	1	0.0%	1	1	100.0%	0	0	0
yiwiki-20071017	1	1	0.0%	1	1	100.0%	0	0	0

Footnotes

↑ If this is less then the total ISBNs, it's because the same ISBN is referenced multiple times in one article. The percentage indicates the redundancy.
↑ Any digit might be wrong, not necessarily the checksum digit.
↑ ^a ^b ^c ^d ^e ^f ^g This is after LA2-bot put hyphens in the right places on October 7-9, 2007

[1] If this is less then the total ISBNs, it's because the same ISBN is referenced multiple times in one article. The percentage indicates the redundancy.

[2] Any digit might be wrong, not necessarily the checksum digit.

[fixhyphens-3] ↑ ^a ^b ^c ^d ^e ^f ^g This is after LA2-bot put hyphens in the right places on October 7-9, 2007

[1]

[2]

[3]