 |
 |
Hi - I would use the first approach - that's what it's for! Cheers. On 17 Feb 2011, at 17:40, Andrej Schoeke wrote: > Hi all, > > first, thank you for such a great mailing list. I worked with a lot of software and never had such a helpful mailing list. :) > > I ran into a problem and I found two possible solution and I am not sure which one would be the best. > My experiment consists of six blocks with a consequent memory test per session per participant. I want to run an analysis that looks for activation for correct remembered pictures and incorrect/not remembered pictures. I also want to run some contrast on these two EVs. > Now, it happens of course, that for some blocks, people have no correct or incorrect answers. So, the corresponding timing file would be empty, crashes would occur and I would be very sad. Especially, as I want to combine the session blocks in a higher level and I need the copes to be there for every block. > > I searched the mailing list and found two ways of dealing with it. > First, I could replace the EV with the empty timing file with an empty EV. (Message-id: <[log in to unmask]>) > Another way might be to replace the empty timing file with a de-weighted entry such as 0 0 0. (<[log in to unmask]>) > Which of these approaches would be "cleaner"? Are there other ways to deal with this issue? > > Thank you so much for your help, > Andrej > --------------------------------------------------------------------------- Stephen M. Smith, Professor of Biomedical Engineering Associate Director, Oxford University FMRIB Centre FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) [log in to unmask] http://www.fmrib.ox.ac.uk/~steve ---------------------------------------------------------------------------