Corrected figures. The main difference is that the position of single instances and 4 instances switched.

NO. of Recs ISBNs Percent

230444194 0 77.71%
55668178 2 18.77%
4766652 1 1.61%
3708352 4 1.25%
616623 3 0.21%
411230 6 0.14%
125715 8 0.04%
65796 5 0.02%
45304 10 0.02%
30155 12 0.01%

Roy

On 5/20/13 5/20/13 • 11:29 AM, "Tennant,Roy" <[log in to unmask]<mailto:[log in to unmask]>> wrote:

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]<mailto:[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]><mailto:[log in to unmask]>

Reply-To: Bibliographic Framework Transition Initiative Forum
<[log in to unmask]<mailto:[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]><mailto:[log in to unmask]>"
<[log in to unmask]<mailto:[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

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-----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]><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]><mailto:[log in to unmask]>)
{__ | / Special Libraries Cataloguing HTTP://www.slc.bc.ca/
___} |__ \__________________________________________________________