Hi all,

Apologies for the naive question, but...

I'm able to do a RWG (randomization within groups) for my stimuli using different rwg values (I have four different sentence types, so I have about 30 groups of four stimuli having the same rwg value), no problem there.

however, I need an additional constraint: I need for each subject to see an equal number of each of the four different types of stimuli (I don't want my subjects to happen to have, say, 5 stimuli of type A, 10 of type B, 3 of type C, and 12 of type D or anything like that!

So, I don't know if we require a metafunction here, or if it's possible at all to have such constraint.

Any ideas would be much appreciated!

Giorgos