Below are Instructions for merging from spss 17
but I have ssps 18 and there is no merge files under the data menu or add cases.
how do I merge files in 18?
Adding Cases. Sometimes data that are related may be in different files that you would like to combine or merge. For example, in a research methods class, every student may collect and then enter data in their own data file. Then, the instructor might want to put all of their data into one file that includes more cases for data analysis. In this case, each file contains the same variables but different cases. To combine these files, have one of the data files open, then left click on Merge Files on the Data menu and select Add Cases. Then specify the file from which the new data will come and click Open. A dialog box will appear showing you which variables will appear in the new file. View it, and if all seems in order, click OK. The two files will be merged. This is fairly simple. See if you can do it yourself in Exercise 3 at the end of this chapter.
Thank you
HD13