Understanding Society User Support

Hi there,

I am using the blood biomarker survey weights in my analysis for Wave_2: indbdub_xw. However, when I load this variable into RStudio I get two options: indbdub_xw.x and indbdub_xw.y.

When I run code to check if the two variables are equal, they are not:

all.equal(Wave_2$indbdub_xw.x, Wave_2$indbdub_xw.y)

[1] "Mean relative difference: 9.993738e-08"

I'm also unable to find examples within the USoc literature on survey weight guidance where w_xxxyyzz_aa has a decimal point and .x or .y at the end.

Please can you tell me what the difference between these two weight options is?

Thanks in advance!