A few months ago, I handled data sets on intravenous drug users and men-having-sex with men (MSMs).
The sampling design used for data collection was RDS, or respondent-driven sampling. Basically, for each sites, some “seeds” or respondents were recruited to participate in the survey. Then, these primary seeds were asked to recruit additional respondents. And so on…(think of the method used by AVON to sell cosmetics)…
The IDs of the respondents reflect their “position” in the entire recruitment process.
For example, given the following IDs
Id=1 > person is a first seed
Id=2 > person is a first seed
Id=12 > person is a seed recruited by 1
id=21 > person is a seed recruited by 2
Id=123 > person is a seed recruited by person 12 (who was recruited by id 1)
I needed to perform an xtreg with grouping based on the seeds. I then, have to cut the IDs, say on the third , second, or fourth level. And then do labeling based on the new ids generated. To perform this, I used the substr command.
Refer to statadaily.wordpress.com for the command. Click here. Thanks Mitch!!!
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