Dear all,
As I just mentioned to Dan in a private email conversation, keeping datasets even with imperfect measurements is important. Particularly for longitudinal analysis.
Also, from what I understand - me being a newby here - is that the data are stored in separate files. Dan suggested reordering the page into categories. Maybe, another option is to create more extensive datasets with more different measurements in a single datafile. On the other hand, the files would become even bigger in size. Not an issue for mee, but for users in the field accesibility (dowlnload bandwidth) could become an issue.