Pseudorandomization with files

Elliot_Luo

Hi,
In the experiment, stimuli are 14 pairs of questions (28 questions in total). Questions in the same pair should not appear successively. In the loop, variables are from a csv file. I followed the example in pseudorandomization and tried to constrain pair for the purpose.
However, the red arrow indicated thatInvalid column name: pair while the file did contain the pair variable.
I wondered if constrain only works when the variables are directly from table in loop item?

Thanks in advance!
Elliot.

Roelof

Hi Elliot,

I can't get pseudorandomization to work either when reading from an external file, but, when you add the following line: setcycle 0 word "" I think it might work; the variables for word are still read from the file, and seem to be constrained to not be repeated if constrain word maxrep=1 is added. I have not checked this very thoroughly with all the randomization options, so be sure to have a look at the preview of the loop table to check everything works as expected.

Hope this works, good luck
Roelof

Elliot_Luo

Hi Roelof,
Thank you for the trick! It works as expected

Many thanks,
Elliot