Oh!! Faulty memory -- I thought I'd read that the randomized value was entered into the _log.csv data file rather than a copy of the input file. Thank you for your prompt reply!

Quote Originally Posted by jason_reed View Post
It's because of the rand(250-750) in column K. As it says in the Using Random Values seciton of the DirectRT manual (http://www.empirisoft.com/directrt/h...m_values.htm):

"When asked to run an input file DirectRT will first scan the file for any instances of the rand() keyword. It will generate the random value as requested and replace the request with the randomized value. DirectRT will then save the results as a new input file--it will share the same name as the origional file but will have the subject ID appended to it. So if your file is called "myfile.csv" and your subject ID is 22, then the new input file will be called "myfile_22.csv" and this is the file that DirectRT will run.In fact, this is a good way to check if you're getting the randomization values you want--after the session, you can open the revised input file and see the actual random values that DirectRT generated. The log data file will also be a good source of information on what random values were generated."

The additional files contain the actual random value chosen and used when your DirectRT input file ran for the Subject ID appended to the name of the original. The only way to stop the creation of those additional files would be to not use the random number function in the spreadsheet.