"Is there any possibility to sort the file without exporting the data?"

Within EpiData Entry: Define the ID field as a key

ID key unique end

then after entering all data, export data (#6 in toolbar) to EpiData file and mark "use index as sort order"

In EpiData Analysis read myfile sort id savedata newfile copyfile myfile.chk newfile.chk

Regards Jens Lauritsen EpiData Association