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My experience is that it becomes difficult to create rosters beyond 600 people. Dividing a group of hundreds into recognizable sub-groups, such as departments, locations, or project teams allows respondents to quickly find the sub-groups they interact with.

With very large groups, I forget the complete roster approach, and go with the "rule of 5" -- nominate up to 5 people who....

See this paper by Ron Burt:
"How many names are enough? Identifying network effects with the least set of listed contacts"
http://faculty.chicagobooth.edu/ronald.burt/research/files/HMN.pdf

Valdis Krebs
Orgnet, LLC
Twitter: @orgnet
http://orgnet.com
http://thenetworkthinkers.com
http://en.wikipedia.org/wiki/Valdis_Krebs

On 2014.5.11, at 15:21, Wesley M Shrum wrote:

> ***** To join INSNA, visit http://www.insna.org *****
>
> Not systematic, but I¹ve found that beyond 7 pages it gets dodgy‹I think
> it depends more on how motivated the respondents are through an inherent
> interest in the list that you give them.
>
> Here¹s a version of our rosters used in Kenya, Ghana, and India for a
> couple of decades.
> http://worldsci.net/ee/index.php/pages/main/6
> (look for the instruments marked ³network²)
>
>
> Wes
>
> Wesley Shrum
> Professor of Sociology, Louisiana State University
> Director, Ethnografilm <http://ethografilm.com>, 8-12 April 2015;
> Director, Fringe Performance Archive <http:fringearchive.org>, National
> Library of Scotland
> Program Officer, Society for Social Studies of Science
> <http://4sonline.org>
>
>
> ------------------------------
>
> Date: Tue, 4 Nov 2014 13:31:25 -0500
> From: "< Janet Okamoto >" <[log in to unmask]>
> Subject: Network roster size and network data quality
>
> ***** To join INSNA, visit http://www.insna.org <http://www.insna.org/>
> *****
>
> Hi all,
>
> I'm currently working on a project collecting network information from a
> community
> health coalition and am looking for any scholarly references to work that
> has examined
> optimal size or thresholds of network rosters given to survey respondents.
> Is there any
> work that has looked at what size or at which point the quality of your
> data starts to
> decrease? How many names and relationships can a person cognitively
> process at one
> time before fatigue sets in and you have to start worrying about data
> quality? Measurement, meaning, and psychometric properties of network
> survey questions has
> been an interest of mine for years, but I haven't seen many publications
> about the topic,
> so am hoping some on this list can help.
>
> Thanks,
>
> Janet
>
> Janet Okamoto, Ph.D
> Research Associate
> Mayo Clinic
> [log in to unmask]
>

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