Mea culpa. I discovered that my algorithm for producing the numbers below
was fatally flawed. I was only checking for the existence of an 020 field,
when in fact I should have been checking for the existence of an 020 $a,
since you can have $c "Terms of availability" without a $a. Therefore, the
numbers below are over-counting the existence of ISBNs. I will see if I
can correct the algorithm and provide more accurate numbers. So sorry for
the oversight.
Roy

On 5/20/13 5/20/13 € 8:06 AM, "Tennant,Roy" <[log in to unmask]> wrote:

>As requested, numbers from WorldCat, the 1 May 2013 Research snapshot,
>with 296,589,450 records:
>
>NO. of Recs ISBNs Percent
>
>230402772  0 77.68%
> 58861390  2 19.85%
>  4269211  4  1.44%
>  1659221  1  0.56%
>   515674  6  0.17%
>   466645  3  0.16%
>   151133  8  0.05%
>    84572  5  0.03%
>    51967 10  0.02%
>    33372 12  0.01%
>
>Keep in mind that WorldCat, being the largest library union database in
>the world, includes a great deal of material that pre-dates the
>establishment of the ISBN.
>Roy
>
>From: Shlomo Sanders
><[log in to unmask]<mailto:[log in to unmask]>
>>
>Reply-To: Bibliographic Framework Transition Initiative Forum
><[log in to unmask]<mailto:[log in to unmask]>>
>Date: Monday, May 20, 2013 5/20/13 € 6:19 AM
>To: "[log in to unmask]<mailto:[log in to unmask]>"
><[log in to unmask]<mailto:[log in to unmask]>>
>Subject: Re: [BIBFRAME] Instance of ISBNs in MARC records
>
>From a large sample of data that we get from publishers:
>
>  *   Only 24.5% with one ISBN!
>  *   40% with multiple ISBNs!
>  *   Largest group has no ISBN!
>
>
>ISBN Count      Percentage of records with X ISBNs
>0       38.57%
>1       24.49%
>2       17.00%
>3       5.88%
>4       10.77%
>5       2.14%
>6       0.65%
>7       0.09%
>8       0.12%
>9       0.24%
>10      0.04%
>
>
>Thanks,
>Shlomo
>
>Experience the all-new, singing and dancing interactive Primo brochure
>
>
>-----Original Message-----
>From: Bibliographic Framework Transition Initiative Forum
>[mailto:[log in to unmask]] On Behalf Of J. McRee Elrod
>Sent: Sunday, May 19, 2013 20:34
>To: [log in to unmask]<mailto:[log in to unmask]>
>Subject: Re: [BIBFRAME] Instance of ISBNs in MARC records
>
>In SLC's database of over 300,000 records, over 169,000 have no ISBN,
>over 114,000 have one, over 19,000 have two, and the number of ISBNs
>ranges up to 36 in one record.
>
>For us, Instances can't be based on ISBNs.
>
>
>Total Records: 315389
>
>020s  Records
>
>00 169021
>01 114221
>02  19745
>03   7403
>04   3238
>05   1149
>06    344
>07    118
>08     29
>09     42
>10     11
>11     16
>12     10
>13     12
>14      4
>15      5
>16      3
>17      7
>18      1
>19      1
>21      1
>22      1
>23      1
>25      3
>27      1
>28      1
>36      1
>
>
>
>   __       __   J. McRee (Mac) Elrod
>([log in to unmask]<mailto:[log in to unmask]>)
>  {__  |   /     Special Libraries Cataloguing   HTTP://www.slc.bc.ca/
>  ___} |__ \__________________________________________________________
>