Dear Eleni:

There are two ways to append - one is within EpiData, the other highly efficient within EpiData Analysis. If you append (not merge) files with the same same structure, try this in EpiData Analysis, ver 0.9 build 38:

* ----Program begins next line cls logclose close

* switch to the folder where your REC files are located cd c:\temp1

erase "abcd.rec" read "a.rec" append "b.rec" append "c.rec" append "d.rec" savedata "abcd.rec" close

* Do some tabulation to check read "abcd.rec" tables sex res1 logclose * --- Program has ended previous line

Best regards,

Hans