## randomization in batch and experiment

##### randomization in batch and experiment
 Author Message mongrel Group: Forum Members Posts: 53, Visits: 147 Hi,I am nearly done, thanks for all the help so far, Dave!I have finished to program an batch consisting of 4 experiments.I want a randomised assignment of subjects to two different experiments and solved that like this:/subjects = (1 of 2)/file = "exp1.iqx"/file = "exp2.iqx"/file = "exp3.iqx"/file = "exp4.iqx"/ groupassignment = subjectnumber /subjects = (2 of 2)/file = "exp1.iqx"/file = "exp2.iqx"/file = "exp3.iqx"/file = "exp4.iqx"/ groupassignment = subjectnumberIn exp1.iqx however, I want the participants also to be randomised to two different conditions, so that I in the end have four groups to compare:1. batch1+exp1.12. batch1+exp1.23. batch2+exp.1.14. batch2+exp.1.2The Exp.1 randomization looks like this:        / subjects = (1 of 2)    / groupassignment = random    / blocks = [1=instruct; 2=block1; 3=block2; 4=block3; 5=block.instructPost]                        / subjects = (2 of 2)    / groupassignment = random    / blocks = [1=instruct; 2=block1; 3=block2; 4=block3; 5=block.instructPost]    **BETWEEN GROUPS**********************************************************************************************************        / group = (1 of 2) (block2=Tool1Y1, block3=RecencyY2)    / group = (2 of 2) (block2=Tool2Y2, block3=RecencyY1)             Now, I am afraid, I might have created only two comparison groups because the subject number seems to define not only which batch is chosen but also which condition of experiment 1...Can you help me?Thanks in advance! Dave posted 5 Years Ago ANSWER Group: Administrators Posts: 11K, Visits: 73K Make sure that both odd and even subject ids get into exp 1 by defining:/subjects = (1,2 of 4)/file = "exp1.iqx"/file = "exp2.iqx"/file = "exp3.iqx"/file = "exp4.iqx"/ groupassignment = subjectnumber /subjects = (3,4 of 4)/file = "exp1.iqx"/file = "exp2.iqx"/file = "exp3.iqx"/file = "exp4.iqx"/ groupassignment = subjectnumber mongrel Group: Forum Members Posts: 53, Visits: 147 Thanks, I thought so... I just hoped, that it could be done in the experiments.But now, I just changed the experiments and did it that way.Thank you! :)

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