User:LA2/ISBN stats 2007

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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
Could
be made
prettier
Should be fixed
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 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 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[edit]

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