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A research project I am part of used a questionnaire to gather
ego-centric data (some details about ego, type and frequency of contact
with alters, and whether ego thought each pair of alters contacted each
other); this was administered both by post and online (and later via
The question I'm interested in (which is a little tangential to the main
thrust of the study) is how these different sets of responders may be
compared, and whether such a comparison can usefully show that they may
be considered as a single sample for other analyses or should be
considered separately (reducing the sample sizes consequentially). Are
there some standard papers that have considered this sort of issue that
I should be looking at? I'd be grateful for any pointers...
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