Someone asked off line how to accomplish this

Situation: You have a file with say 1000 observations and you wish to encrypt the field containing social service numbers:

1. use epidata to make a qes file (tools menu - qes file from recfile) 2. edit the field in question from e.g. string field : v1 social id __________________________ to v1 social id <e > (same length)

numerical: v1 social id ######################## to v1 social id <e >

3. Save the qes file 4. start enter data (point 4 on work process toolbar) and EpiData asks if you wish to update based on the revised qes file. 5. Do so and you are asked for passwords

Thats all.

Jens Lauritsen Initiator and Coordinator of EpiData EpiData Association