Support #814
closed
Longitudinal weight in R with - wide datset
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Description
Dear UKHLS User Support team,
I'm conducting a latent growth curve analysis using waves 2-6 in R. The dataset is in the wide format. I was wondering whether I can use the longitudinal weight provided in the last wave as my weighting variable or if any further manipulation is needed.
Kind regards,
Eleonora Iob
Updated by Peter Lynn over 7 years ago
- Category set to Weights
- Assignee set to Eleonora Iob
- Target version set to M6
- % Done changed from 0 to 50
I would have thought that the longitudinal weight should be perfectly appropriate for this case, e.g. f_indinub_lw or f_indpxub_lw or f_psnenub_lw, depending on which data sources you are using. Note the "ub"part of the variable names, which will include the BHPS samples that entered the sample at wave 2.
Updated by Victoria Nolan
Updated by Eleonora Iob over 7 years ago
Hello Peter,
Thank you for your prompt reply. I'm using f_indnsub_lw as I have data from the nurse and adult main interview.
I have a further question related to the longitudinal weight. As I'm using Maximum Likelihood Estimation, I decided to include in the analysis all participants who were present at the first time point (i.e. wave 2), although some of them dropped out at subsequent waves (N= 8856). However, f_indnsub_lw is not available for almost 2000 participants. Is this because they were not present in the last wave?
Kind regards,
Eleonora
Updated by Peter Lynn over 7 years ago
Yes. As described in the User Guide, the longitudinal weights are defined for sample members who participated in all of a set of consecutive waves. In the case of the "ub" weights, this set is all waves from wave 2 to wave w inclusive, for the w_ version of the weight, e.g. from 2 to 6 in the case of f_indnsub_lw.
As I understand it, your analysis base is not this balanced longitudinal sample but is instead the wave 2 participants, regardless of subsequent participation behaviour. The optimum weight for you wouldtherefore be the wave 2 cross-sectional weight, b_indnsus_xw.
You might also want to add the BHPS sample participants to your analysis. They had their nurse visit at wave 3, so for them you would use c_indnsbh_xw.
Updated by Eleonora Iob over 7 years ago
That's great. Thank you very much for your help!
Kind regards,
Eleonora
Updated by Stephanie Auty over 7 years ago
- Status changed from New to Resolved
- % Done changed from 50 to 100