Longitudinal or cross-sectional weighting with change scores?
I actualy don't think it's quite a change score exactly, but for my outcome variable, I am looking at whether responses to a variable changed between waves 4 and 6. To do this, I created a variable to indicate yes, their answer had changed or no, it had not.
For my predictors, I am using a mixture of wave 4 variables and further "change" variables I have created (or were available in the dataset) to indicate whether there has been change or not between waves 4 and 6.
I have been trying to determine if a longitudinal weight is more appropriate (because I am using variables from more than one wave) or if the wave 6 (or 4), cross-sectional weight would be more appropriate (because I don't have the repeated measures that a more typical longitudinal analysis would). It would be amazing if you are able to advise on this.
I am using some self-completion items and the combined BHPS and UKHLS sample, so I am thinking that my choice in weights comes down to f_indscub_xw or f_indscub_lw, although, please correct me if I'm wrong here.
Sorry if this (or similar) has been answered in previous weighting questions, but I couldn't see anything that quite matched it in the ones I looked through.
Updated by Alita Nandi about 3 years ago
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- Assignee changed from Olena Kaminska to Colin Whittle
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Yes, as you are looking at change between Waves 4 & 6 and including self-completion items, you should use longitudinal self-completion weights from wave 6: f_indscub_lw. This weight will account for non-response between waves 4 & 6.
On behalf of Understanding Society User Support
Updated by Colin Whittle about 3 years ago
Brilliant, thank you. However, (if I can ask a follow-up?) I see how the longitudinal weight adjusts for non-response by effectively removing non-responders from the analysis and that it does this even in cases where they have responded to the waves that are within my range of interest (i.e. waves 4, 5 and 6), but they missed an earlier wave.
I want to keep the people who responded to waves 4, 5 and 6, even if they missed previous waves. To achieve this, someone suggested to me that I could divide wave 6's cross-sectional weight by wave 4's cross-sectional weight to create a new weight, which would still provide the necessary weighting, without losing the sample. Would that be a possibility do you think?
Updated by Olena Kaminska about 3 years ago
Alita's previous suggestion on the weight is correct. I see your point that you would want to include more people in your analysis as you have information from them.
A few points to consider:
1. First use our weight with your analysis and look at your results. It is only worth doing tailored weight if your results are marginally significant (e.g. p=0.06) and your journals are not happy to publish with such results;
2. You can indeed create your tailored weight. The suggestion your mentioned is not complete - what you will get is only the correction for nonresponse between waves 4 and 6. So no correction for unequal selection probabilities or any nonresponse in wave 1 (most of it comes from wave 1 by the way), and any nonresponse until wave 4 will not be taken into account. In other words your results will not be representative of a population.
3. If you are interested in creating your own tailored weight I can share with you a syntax example. Please just email us a request.
Hope this helps,