Present 2 or more images randomly out of a pool? (case 20112)

[Hufi13]

Hello,

I would like to run an experiment and present 2 or 3 images (pictures) at the same time. I have got 45 pictures of which 2-3 should be shown randomly. The participant should rank or choose them.

I tried to create a test with MediaLab, but I found no way to choose randomly 2-3 images out of a pool. Then, I tried DirectRT and created a stimlist called "pics" like in your examples. But DirectRT is ether crashing the run or showing an error message. It crashed in two ways: directly and does not start or after the introduction slide. The error messages says "Row 3 has a missing value for one of its TIME columns".


I am not sure, maybe the data file is too big. However, I reduced the image size but the problem persists.

I will upload my cvs.file, so maybe you can find my fault.