We are unsure why we seem to be missing data for a particular questionnaire, included in an experiment.
We started with a initial version of the questionnaire that we changed to account for an added...

We have copied and pasted our MediaLab experiment onto a second computer (along with all of the questionnaire files and the SPSS datafiles) in order to maximize efficiency of data entry. However, we...

We are having difficulty with one of our experiments using MediaLab. We are repeatedly getting "94Invalid use of the null." We have re-made the experiment several times, checked through all of the...