For my RAE project I am using 2010 data from the China Family Panel Survey. The data files are divided into smaller sub-groups, such as child, adult, family. I am utilising the adult survey, but I require a variable from the family survey (net family income) that is not found in the adult survey. I understand that to use the merge command the two datasets need to have a variable in common. Although this variable is not directly found in the adult survey, since these datasets are all part of one larger survey and there are individual, family and community ids I suspect that there is a way to add the extra variable. I have tried to use the merge command but I end up getting error messages like weights not allowed. Your help would be much appreciated, thank you in advance.