wanted noreplace on blocks but got selection of items


wanted noreplace on blocks but got selection of items

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Anna Halm
Anna Halm
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The main idea is to chose randomly the order of blocks from a set of 4 different block within an experiment. In the end all block should have been presented. Every block contains two trails (one audio file and a set of three items). Again, all audio files and items should be show. So it's really only about the order of the blocks.


I tried to use the noreplace on a block-level. As a result, one of the three items from both blocks are chosen and the others won't show up. Am I wrong to use noreplace in this case?


<expt>
/ subjects = (1 of 2)
/ blocks = [1-4=noreplace(A1, A2, A3, A4)]
</expt>

<expt>
/ subjects = (2 of 2)
/ blocks = [1-2=noreplace(B1, B2, B3, B4)]
</expt>


Thanks a lot!


Anna


Dave
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How you sample blocks at the expt level *has nothing to do with* and is *completely unrelated to* how *trials may sample stimuli within those blocks*. Please see the documentation for the /resetinterval attribute for details.


Luise
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My main idea is the same as Anna had. In my experiment I need to randomly present 100 blocks without replacement. I want every block to be presented exactly once and in a random order. "Noreplace" does not seem to work. There are always some blocks presented more than once. I also tried </defaults> / resetinterval = 0 </defaults> but maybe I am using it the wrong way or it does not help neither.
This is how (the important part of my) experiment looks like:

<defaults> / font = ("Arial", -21, 400, 0, 34)
/ txbgcolor = (250, 250, 250) / screencolor = (250, 250, 250)
/ pretrialpause = 0 / posttrialpause = 150
/endlock = true
/ resetinterval = 0
</defaults>

<text cue1>
/ numitems = 1
/ items = ("xy")
/ font = ("Arial", -37, 700, 0, 34) / position = (50,85) / color = (0, 0, 0) / area = (900,200) 
</text>

<picture pic_1>/numitems = 1 / items = ("1.jpg") / position = (50, 1) / valign = top / size=(672, 813,12)</picture>
<picture pic_2>/numitems = 1 / items = ("2.jpg") / position = (50, 1) / valign = top / size=(672, 813,12)</picture>
<picture pic_3>/numitems = 1 / items = ("3.jpg") / position = (50, 1) / valign = top / size=(672, 813,12)</picture>

<likert person_1> / numpoints = 7 / anchors = [1 = "gar nicht"; 7 = "sehr"]
    / stimulusframes = [1= pic_1, cue1]  / position = (50, 90) / anchorwidth = 6% </likert>

<likert person_2> / numpoints = 7 / anchors = [1 = "gar nicht"; 7 = "sehr"]
    / stimulusframes = [1= pic_2, cue1]  / position = (50, 90) / anchorwidth = 6% </likert>

<likert person_3> / numpoints = 7 / anchors = [1 = "gar nicht"; 7 = "sehr"]
    / stimulusframes = [1= pic_3, cue1]  / position = (50, 90) / anchorwidth = 6% </likert>
...

<block blockp1>/ trials = [1=person_1]</block>
<block blockp2>/ trials = [1=person_2]</block>
<block blockp3>/ trials = [1=person_3]</block>
...

<expt ratings>
/ blocks = [1-100= noreplace (blockp1,blockp2,blockp3,blockp4,blockp5, ..., blockp100)]
</expt>

Luise
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Do you have any advice how to fix this problem? I´d be really greatful!


Dave
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There is no problem here. If you have specified your noreplace() pool in the <expt>'s /blocks attribute correctly, i.e., there are 100 blocks listed and every block is only listed a single time, each block will be run exactly once. /resetinterval has nothing to do with it. /resetinterval determines whether a stimulus element's selection pool should be reset between blocks or not.

<expt>
/ blocks = [1-4 = noreplace(a,b,c,d)]
</expt>

with

<block a>
...
</block>

<block b>
...
</block>

<block c>
...
</block>

<block d>
...
</block>

will result in a random order of blocks a, b, c and d -- with each block run exactly once.

Dave
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To add: You very likely have *mistakes* in your script that make you *think* a certain block is repeated.

What could those mistakes be?

#1: You have <block>s that run the wrong <likert>, i.e. something like

<block blockp5>
/ trials = [1=person_3]
</block>

#2: You have <likert>s that display the wrong <picture>, i.e., something like

<likert person_5>
...
/ stimulusframes = [1= pic_3, cue1] 
...
</likert>

and/or

#3: You have <picture>s that display the wrong item

<picture pic_5>
...
/ items = ("3.jpg")
...
</picture>




Luise
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Thank you...I will search for mistakes again then. It is good to know that in theory the way I used should work.

Dave
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Go through it and see if you can spot anything along the lines outlined in the previous reply. If you can't find any (or all of the) mistakes and need a second pair of eyes, attach the script file to this thread (click +Insert -> Add File) and I'll be happy to take a look.

Luise
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Hi again...thank you for your offer. I really appreciate it. I searched for mistakes and tried a few more ideas I had, but some pictures are still presented more than once and I just cannnot figure out why. So you find my script attached to this message. It would be great if you could afford to take a look at it.

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Dave
Dave
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It would be helpful if you could specify *which* pictures (by name) you think are being repeated.

GO


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