'0' weight in BHPS
I have a question regarding the weight variable xrwtuk1 in the BHPS. For my analysis I have selected cases who have a valid response to my two main vairables (economic status and GHQ-12), and then had a look at the weights. Within the cross-sectional weight variable for the UK (xrwtuk1) I have around 2.5% of cases which are '0' weighted. All of the cases I have selected are full interviews, and the '0' weighted cases have a range of sample origins (67% are OSMs). I have read the weighting section of the user manual but I cannot find a reason that matches the data. Please could you advise me on what may be the cause of the '0' weight?
Updated by Olena Kaminska over 10 years ago
The reason for 0 values in cross-sectional weights is most likely due to no OSM within a household having longitudinal main interview non-zero weight in the wave you are looking at. Cross-sectional weights are inferred from longitudinal weights, and if every OSM in a household have 0 longitudinal weights, there is no positive value to infer. As you indicated this is a problem for only a small portion of a sample.
Hope this helps,