## Group variables: random and specific presentation

 Author Message paughl Guru Group: Forum Members Posts: 46, Visits: 154 Hi Folks,--I have 2 versions of each stim.--Participants should only ever get 1 of the versions of each stim.--Participants should get 50% of Version 1 and 50% of Version 2 (ie: half the participants get the alternate version).--AND THIS IS THE BIT I NEED HELP WITH: For all participants, the first stim they get should always be a randomly selected Version 1 stim.  This stim should not be repeated later.Here's how I've done everything except the last point above (s=Version1, ns=Version2):/ group = (1 of 2) (sit1=s1, sit2=ns2, sit3=s3, sit4=ns4, sit5=s5, sit6=ns6, sit7=s7, sit8=ns8, sit9=s9, sit10=ns10,sit11=s11, sit12=ns12, sit13=s13, sit14=ns14, sit15=s15, sit16=ns16, sit17=s17, sit18=ns18, sit19=s19, sit20=ns20)/ group = (2 of 2) (sit1=ns1, sit2=s2, sit3=ns3, sit4=s4, sit5=ns5, sit6=s6, sit7=ns7, sit8=s8, sit9=ns9, sit10=s10,sit11=ns11, sit12=s12, sit13=ns13, sit14=s14, sit15=ns15, sit16=s16, sit17=ns17, sit18=s18, sit19=ns19, sit20=s20)Many thanks in advance!paul Tags Dave Supreme Being Group: Administrators Posts: 9.8K, Visits: 46K Impossible to answer based on the provided information. For example, it isn't at all clear what e.g. "sit1" is. Is it a or element? Is it a element?  Or perhaps a ?Since you do not explain at all how you select stimuli in the first place, etc., the question of how to force the selection of a certain type of stimulus cannot be answered either. paughl Guru Group: Forum Members Posts: 46, Visits: 154 Apologies.Attached is the full script.Thanks,paul Attachments SIT2.exp (415 views, 49.00 KB) Dave Supreme Being Group: Administrators Posts: 9.8K, Visits: 46K This seems like an awkward way to set this up. There should be no reason whatsoever to have separate a separate , ,