Support #978
different size in "merge" and "previously been interviewed"
Added by Eduwin Pakpahan about 6 years ago.
Updated almost 6 years ago.
Description
Dear all,
I am a new user of understanding society, so pls apologize if my question is quite basic.
I am trying to merge the wave1 and wave2 data, i.e. merging "b_indresp.dta" and "a_indresp.dta". Using merge function in stata (the stata code is 'merge 1:1 pidp using ... '), I found 38388 participants were both in wave1 and 2, 162019 were new entrants in wave 2 and 12606 were in wave 1 only. Then I look at those who have been interviewed before, by 'tab b_ff_ivlolw', I found 46164 individual had previously been interviewed. This is bigger than 38388 I obtained beforehand.
Do I miss something here or misunderstood with the b_ff_ivlolw?
- Category set to Survey design
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Many thanks for your enquiry. The Understanding Society team is looking into it and we will get back to you as soon as we can.
Best wishes,
Stephanie Auty - Understanding Society User Support Officer
- Private changed from Yes to No
- Status changed from In Progress to Feedback
- Assignee changed from Stephanie Auty to Eduwin Pakpahan
- Target version set to M2
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Dear Eduwin,
Looking at the variable b_hhorig will help you to answer this question. This is the sample origin. If you look at this variable for those who have b_ff_ivlolw==1 (they have had a previous individual interview) but are not in a_indresp, you will see that almost all of these are BHPS sample members, so their previous interview was during BHPS data collection, rather than Wave 1 of Understanding Society.
Best wishes,
Stephanie Auty - Understanding Society User Support Officer
Thanks a lot, Stephanie.
I understand now the "previous wave".
Rgds,
Eduwin
- Status changed from Feedback to Resolved
- % Done changed from 70 to 100
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