Millisecond Forums

You'll have to provide more details about your procedure first."In my project I'm testing 4 Brands (represented by logos) and 12 Attributes.I want to test each brand in combination with all of the 12 Attributes - but in a random order."

Allright, sorry!

This should be fairly easy:

<block myblock>
/ trials = [1-48=mytrial]
</block>

<trial mytrial>
/ stimulusframes = [1=mybrand, myattribute]
/ trialduration = 100
</trial>

<text mybrand>
/ items = branditems
/ select = list.branditemlist.nextvalue
/ position = (50%, 40%)
</text>

<text myattribute>
/ items = attributeitems
/ select = list.attributeitemlist.nextvalue
/ position = (50%, 60%)
</text>

<item branditems>
/ 1 = "Brand 1"
/ 2 = "Brand 2"
/ 3 = "Brand 3"
/ 4 = "Brand 4"
</item>

<item attributeitems>
/ 1 = "Attribute 1"
/ 2 = "Attribute 2"
/ 3 = "Attribute 3"
/ 4 = "Attribute 4"
/ 5 = "Attribute 5"
/ 6 = "Attribute 6"
/ 7 = "Attribute 7"
/ 8 = "Attribute 8"
/ 9 = "Attribute 9"
/ 10 = "Attribute 10"
/ 11 = "Attribute 11"
/ 12 = "Attribute 12"
</item>

<list branditemlist>
/ items = (1,1,1,1,1,1,1,1,1,1,1,1,
    2,2,2,2,2,2,2,2,2,2,2,2,
    3,3,3,3,3,3,3,3,3,3,3,3,
    4,4,4,4,4,4,4,4,4,4,4,4)
/ selectionmode = random
</list>

<list attributeitemlist>
/ items = (1,2,3,4,5,6,7,8,9,10,11,12,
    1,2,3,4,5,6,7,8,9,10,11,12,
    1,2,3,4,5,6,7,8,9,10,11,12,
    1,2,3,4,5,6,7,8,9,10,11,12)
/ selectionmode = list.branditemlist.currentindex
</list>

that works like a charm thank you!! :)
I don't want my participants to get tired during the experiment during the test, so i thought of splitting the test into 3 blocks of 15, 15 and 18 trials. Would it be possible to keep the randomization up over the different blocks?

> Would it be possible to keep the randomization up over the different blocks?Yes. You'll want to refer to the documentation on the <list> element's /resetinterval attribute.

I'm sorry - I don't get it. We are busines customers of yours, and we need to set this project up by tomorrow so I hope you can help me out on this :(

<expt myexpt>
/ blocks = [1=myblock1; 2=myblock2; 3=myblock3]
</expt>

<block myblock1>
/ trials = [1-15=mytrial]
</block>

<block myblock2>
/ trials = [1-15=mytrial]
</block>

<block myblock3>
/ trials = [1-18=mytrial]
</block>

<trial mytrial>
/ stimulusframes = [1=mybrand, myattribute]
/ trialduration = 100
</trial>

<text mybrand>
/ items = branditems
/ select = list.branditemlist.nextvalue
/ position = (50%, 40%)
</text>

<text myattribute>
/ items = attributeitems
/ select = list.attributeitemlist.nextvalue
/ position = (50%, 60%)
</text>

<item branditems>
/ 1 = "Brand 1"
/ 2 = "Brand 2"
/ 3 = "Brand 3"
/ 4 = "Brand 4"
</item>

<item attributeitems>
/ 1 = "Attribute 1"
/ 2 = "Attribute 2"
/ 3 = "Attribute 3"
/ 4 = "Attribute 4"
/ 5 = "Attribute 5"
/ 6 = "Attribute 6"
/ 7 = "Attribute 7"
/ 8 = "Attribute 8"
/ 9 = "Attribute 9"
/ 10 = "Attribute 10"
/ 11 = "Attribute 11"
/ 12 = "Attribute 12"
</item>

<list branditemlist>
/ items = (1,1,1,1,1,1,1,1,1,1,1,1,
    2,2,2,2,2,2,2,2,2,2,2,2,
    3,3,3,3,3,3,3,3,3,3,3,3,
    4,4,4,4,4,4,4,4,4,4,4,4)
/ selectionmode = random
/ resetinterval = 0
</list>

<list attributeitemlist>
/ items = (1,2,3,4,5,6,7,8,9,10,11,12,
    1,2,3,4,5,6,7,8,9,10,11,12,
    1,2,3,4,5,6,7,8,9,10,11,12,
    1,2,3,4,5,6,7,8,9,10,11,12)
/ selectionmode = list.branditemlist.currentindex
</list>

Thank you so much Dave. Our Project is running fine now!