99 as values for variables that should not be missing values?

[imruoxue]

[edited by moderator]

I'm using MediaLab v.2004 and I'm having similar problem of missing data. My .exp file have four conditions(4 different orders of the questionnairs), and in each condition there are 6 questionnaires in the fixed order, finally in each questionnaire there are 100 items (random order) in four blocks (fixed order of block).

But when I run my experiment at any one of the four conditions, some time the program just could not finish all the items in one questionnaire (random questionnaire, but not a specific one every time), and then the rest of the items in that questionnaire were skipped which were recorded as 99 default number in the data file. I could not figure what the problem is, since it happens randomly by questionnaire and randomly started to skip from a item. Some time, the program went pretty well, but some other times the data was just missing. Thank you so much.

[jarvis24]

If items are being skipped then it makes sense that you would see 99's as that is the default value for missing values and skipped items. It sounds like you are not expecting any (or some) of these items to be skipped though. If that's the case, please attach or email us a copy of your experiment folder--complete with the exp, que and data folder and I'll check it out. Be sure to zip the folder before attaching it (as opposed to attaching several separate files).