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Katia
With a 41.3% response rate you have some difficulties.  Nonetheless, it 
really depends on what you want to do with the data and which 
organizations are missing.  One advantage to network data is that you 
still have information on those that are missing.  For example, you know 
whether they were nominated often and by whom.  I suspect though, that 
your problem will be in missing data on attribute information and here 
is where you will have some difficulty.  So I would suggest analyzing 
the network you have and characterize the missing organizations.  Then 
specify your research questions and see if the missing data affect the 
research question. 
- Tom

Katia Pilati wrote:

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>
>Dear all,
>I have a doubt concerning the data I have collected on organizations, namely if they can be considered a complete network or a sum of egonetworks. 
>Data represent the entire population of immigrant organizations in a city among which 46 organizations were interviewed and 19 were missing. The questionnaire submitted to the organizations included questions on  different kind of relationships that interviewed orgs had with other immigrant orgs. The questionnaire presented a roaster of possible contacted immigrant organizations even thou it did not include all of them and there was a free call possibility of adding any organization with which the interviewed ones had contact with. Due to the missings and the uncomplete list, I wonder if I can consider the interviewed organizations as a complete network or if I should consider them as a sum of egonets.
>Thank you
>Katia 
>
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---
Thomas W. Valente, PhD
Director, Master of Public Health Program
http://www.usc.edu/medicine/mph/
Department of  Preventive Medicine
School of Medicine
University of Southern California
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