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Jakob
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Group: Forum Members
Posts: 16,
Visits: 52
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After the fast reply to my last question I am trying it again. I am very suprised I couldn't find a previous post asking the same thing, because it appears to me to be a standard feature I am looking for:
I have four stimuli. I want the order of the stimuli randomized per subject at the beginning of the experiment (counterbalancing between subjects). Then I want to use the same order of stimuli at various points of the experiment.
So lets say I have four stimuli:
<item Simuli_Portraits>
/1 = "flower1.jpg"
/2 = "flower2.jpg"
/3 = "flower3.jpg"
/4 = "flower4.jpg"
</item>
I could call a specific item in "picture" using select:
<picture Portrait1>
/ items = Simuli_Portraits
/ select = 1
</picture>
All I would need is a shuffeled array of numbers that I could call one by one via select, let's say
/select = order_stimuli(1), where order_stimuli is a random order of the numbers 1-4
I can also create a sequence of numbers via list:
<list order_stimuli>
/ items = (1,4)
/ selectionmode = random
/ selectionrate = experiment
</list>
Yet, what I don't understand is whether this really provides me a list of numbers or only one number. All I need is a function that shuffles an array of numbers, in which I can call the x-th element of the array.
I was also thinking about some workaround methods:
1. Manually creating all possible orders (a list of items with all combination "1234", "1243, "1324", ..., "4321") as randomly choosing one. Here again I have the problem that I don't know how to call the x-th element of the string/number/array for select in the picture function.
2. Using some complicated randomization with branches at the beginning of the experiment to create a randomized order in items, also not having a clue how that could work.
I am very much into the logic of (dynamical) indexing that I might miss the very obvious solution on how to keep randomization consistent throughout multiple blocks of the experiment. Thank you for your help!
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Dave
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Group: Administrators
Posts: 12K,
Visits: 98K
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+xAfter the fast reply to my last question I am trying it again. I am very suprised I couldn't find a previous post asking the same thing, because it appears to me to be a standard feature I am looking for: I have four stimuli. I want the order of the stimuli randomized per subject at the beginning of the experiment (counterbalancing between subjects). Then I want to use the same order of stimuli at various points of the experiment. So lets say I have four stimuli: <item Simuli_Portraits>
/1 = "flower1.jpg"
/2 = "flower2.jpg"
/3 = "flower3.jpg"
/4 = "flower4.jpg"
</item>
I could call a specific item in "picture" using select:
<picture Portrait1>
/ items = Simuli_Portraits
/ select = 1
</picture>
All I would need is a shuffeled array of numbers that I could call one by one via select, let's say
/select = order_stimuli(1), where order_stimuli is a random order of the numbers 1-4
I can also create a sequence of numbers via list:
<list order_stimuli>
/ items = (1,4)
/ selectionmode = random
/ selectionrate = experiment
</list>
Yet, what I don't understand is whether this really provides me a list of numbers or only one number. All I need is a function that shuffles an array of numbers, in which I can call the x-th element of the array.
I was also thinking about some workaround methods:
1. Manually creating all possible orders (a list of items with all combination "1234", "1243, "1324", ..., "4321") as randomly choosing one. Here again I have the problem that I don't know how to call the x-th element of the string/number/array for select in the picture function.
2. Using some complicated randomization with branches at the beginning of the experiment to create a randomized order in items, also not having a clue how that could work.
I am very much into the logic of (dynamical) indexing that I might miss the very obvious solution on how to keep randomization consistent throughout multiple blocks of the experiment. Thank you for your help!
What you do is this: Have one <list> containing the values 1 to 4 set to random selection. Have another empty <list> set to sequential selection. Sample four values from the 1st list /onexptbegin and store them in the empty list. You now have a fixed randomly generated sequence which you can use for selection as needed. In a nutshell: <list rand> / poolsize = 4 / selectionrate = always / selectionmode = random / replace = false </list> <list fixedseq> / selectionmode = sequence </list> <expt> / onexptbegin = [ list.fixedseq.appenditem(list.rand.nextindex); list.fixedseq.appenditem(list.rand.nextindex); list.fixedseq.appenditem(list.rand.nextindex); list.fixedseq.appenditem(list.rand.nextindex); ] / blocks = [1=myblock] </expt> <block myblock> / trials = [1-16 = mytrial] </block> <trial mytrial> / stimulusframes = [1=mytext] / validresponse = (57) </trial> <text mytext> / items = myitems / select = list.fixedseq.nextvalue </text> <item myitems> / 1 = "A" / 2 = "B" / 3 = "C" / 4 = "D" </item> Hope this helps.
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Dave
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Group: Administrators
Posts: 12K,
Visits: 98K
|
+x+xAfter the fast reply to my last question I am trying it again. I am very suprised I couldn't find a previous post asking the same thing, because it appears to me to be a standard feature I am looking for: I have four stimuli. I want the order of the stimuli randomized per subject at the beginning of the experiment (counterbalancing between subjects). Then I want to use the same order of stimuli at various points of the experiment. So lets say I have four stimuli: <item Simuli_Portraits>
/1 = "flower1.jpg"
/2 = "flower2.jpg"
/3 = "flower3.jpg"
/4 = "flower4.jpg"
</item>
I could call a specific item in "picture" using select:
<picture Portrait1>
/ items = Simuli_Portraits
/ select = 1
</picture>
All I would need is a shuffeled array of numbers that I could call one by one via select, let's say
/select = order_stimuli(1), where order_stimuli is a random order of the numbers 1-4
I can also create a sequence of numbers via list:
<list order_stimuli>
/ items = (1,4)
/ selectionmode = random
/ selectionrate = experiment
</list>
Yet, what I don't understand is whether this really provides me a list of numbers or only one number. All I need is a function that shuffles an array of numbers, in which I can call the x-th element of the array.
I was also thinking about some workaround methods:
1. Manually creating all possible orders (a list of items with all combination "1234", "1243, "1324", ..., "4321") as randomly choosing one. Here again I have the problem that I don't know how to call the x-th element of the string/number/array for select in the picture function.
2. Using some complicated randomization with branches at the beginning of the experiment to create a randomized order in items, also not having a clue how that could work.
I am very much into the logic of (dynamical) indexing that I might miss the very obvious solution on how to keep randomization consistent throughout multiple blocks of the experiment. Thank you for your help!
What you do is this: Have one <list> containing the values 1 to 4 set to random selection. Have another empty <list> set to sequential selection. Sample four values from the 1st list /onexptbegin and store them in the empty list. You now have a fixed randomly generated sequence which you can use for selection as needed. In a nutshell: <list rand> / poolsize = 4 / selectionrate = always / selectionmode = random / replace = false </list> <list fixedseq> / selectionmode = sequence </list> <expt> / onexptbegin = [ list.fixedseq.appenditem(list.rand.nextindex); list.fixedseq.appenditem(list.rand.nextindex); list.fixedseq.appenditem(list.rand.nextindex); list.fixedseq.appenditem(list.rand.nextindex); ] / blocks = [1=myblock] </expt> <block myblock> / trials = [1-16 = mytrial] </block> <trial mytrial> / stimulusframes = [1=mytext] / validresponse = (57) </trial> <text mytext> / items = myitems / select = list.fixedseq.nextvalue </text> <item myitems> / 1 = "A" / 2 = "B" / 3 = "C" / 4 = "D" </item> Hope this helps. Oh, and if you have several fixed orders you wish to counterbalance between subjects, you can do this like so, by essentially nesting lists: <list orders> / items = (list.order1.nextvalue, list.order2.nextvalue) / selectionmode = values.ordernumber </list> <list order1> / items = (1,2,3,4) / selectionmode = sequence </list> <list order2> / items = (4,3,2,1) / selectionmode = sequence </list> <values> / ordernumber = 1 </values> <expt> / onexptbegin = [ values.ordernumber = 1; ] / blocks = [1=myblock] / subjects = (1 of 2) / groupassignment = groupnumber </expt> <expt> / onexptbegin = [ values.ordernumber = 2; ] / blocks = [1=myblock] / subjects = (2 of 2) / groupassignment = groupnumber </expt> <block myblock> / trials = [1-16 = mytrial] </block> <trial mytrial> / stimulusframes = [1=mytext] / validresponse = (57) </trial> <text mytext> / items = myitems / select = list.orders.nextvalue </text> <item myitems> / 1 = "A" / 2 = "B" / 3 = "C" / 4 = "D" </item>
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Jakob
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Group: Forum Members
Posts: 16,
Visits: 52
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+x+x+xAfter the fast reply to my last question I am trying it again. I am very suprised I couldn't find a previous post asking the same thing, because it appears to me to be a standard feature I am looking for: I have four stimuli. I want the order of the stimuli randomized per subject at the beginning of the experiment (counterbalancing between subjects). Then I want to use the same order of stimuli at various points of the experiment. So lets say I have four stimuli: <item Simuli_Portraits>
/1 = "flower1.jpg"
/2 = "flower2.jpg"
/3 = "flower3.jpg"
/4 = "flower4.jpg"
</item>
I could call a specific item in "picture" using select:
<picture Portrait1>
/ items = Simuli_Portraits
/ select = 1
</picture>
All I would need is a shuffeled array of numbers that I could call one by one via select, let's say
/select = order_stimuli(1), where order_stimuli is a random order of the numbers 1-4
I can also create a sequence of numbers via list:
<list order_stimuli>
/ items = (1,4)
/ selectionmode = random
/ selectionrate = experiment
</list>
Yet, what I don't understand is whether this really provides me a list of numbers or only one number. All I need is a function that shuffles an array of numbers, in which I can call the x-th element of the array.
I was also thinking about some workaround methods:
1. Manually creating all possible orders (a list of items with all combination "1234", "1243, "1324", ..., "4321") as randomly choosing one. Here again I have the problem that I don't know how to call the x-th element of the string/number/array for select in the picture function.
2. Using some complicated randomization with branches at the beginning of the experiment to create a randomized order in items, also not having a clue how that could work.
I am very much into the logic of (dynamical) indexing that I might miss the very obvious solution on how to keep randomization consistent throughout multiple blocks of the experiment. Thank you for your help!
What you do is this: Have one <list> containing the values 1 to 4 set to random selection. Have another empty <list> set to sequential selection. Sample four values from the 1st list /onexptbegin and store them in the empty list. You now have a fixed randomly generated sequence which you can use for selection as needed. In a nutshell: <list rand> / poolsize = 4 / selectionrate = always / selectionmode = random / replace = false </list> <list fixedseq> / selectionmode = sequence </list> <expt> / onexptbegin = [ list.fixedseq.appenditem(list.rand.nextindex); list.fixedseq.appenditem(list.rand.nextindex); list.fixedseq.appenditem(list.rand.nextindex); list.fixedseq.appenditem(list.rand.nextindex); ] / blocks = [1=myblock] </expt> <block myblock> / trials = [1-16 = mytrial] </block> <trial mytrial> / stimulusframes = [1=mytext] / validresponse = (57) </trial> <text mytext> / items = myitems / select = list.fixedseq.nextvalue </text> <item myitems> / 1 = "A" / 2 = "B" / 3 = "C" / 4 = "D" </item> Hope this helps. Oh, and if you have several fixed orders you wish to counterbalance between subjects, you can do this like so, by essentially nesting lists: <list orders> / items = (list.order1.nextvalue, list.order2.nextvalue) / selectionmode = values.ordernumber </list> <list order1> / items = (1,2,3,4) / selectionmode = sequence </list> <list order2> / items = (4,3,2,1) / selectionmode = sequence </list> <values> / ordernumber = 1 </values> <expt> / onexptbegin = [ values.ordernumber = 1; ] / blocks = [1=myblock] / subjects = (1 of 2) / groupassignment = groupnumber </expt> <expt> / onexptbegin = [ values.ordernumber = 2; ] / blocks = [1=myblock] / subjects = (2 of 2) / groupassignment = groupnumber </expt> <block myblock> / trials = [1-16 = mytrial] </block> <trial mytrial> / stimulusframes = [1=mytext] / validresponse = (57) </trial> <text mytext> / items = myitems / select = list.orders.nextvalue </text> <item myitems> / 1 = "A" / 2 = "B" / 3 = "C" / 4 = "D" </item> Thank you very much for your fast response. Unfortunately it is not solving my problem. "/ select = list.orders.nextvalue" is not working for me, because I do not always want the "next value". I want participants to judge 4 images. First regarding one trait, then regarding another trait and so on. The participant has several options to get additional information, branching to several different pages/trials. Easiest would be a function "/ select = list.orders.1", calling the first number of the fixed sequence list "fixedseq" whenever I need to. Working with nextvalue would drive me crazy, because I want to call the same number in different blocks. A different idea: I could create a list of all combinations as strings, call the n-th position via some regex (if possible), convert that string to a number that could be used for / select". For example would " /a{2}/" extract the third value of a string "3412", providing me a "1". But I neither know whether Regey works nor whether it is possible to to use/convert the string to a number usable by "/ select".
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Jakob
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Group: Forum Members
Posts: 16,
Visits: 52
|
+x+x+xAfter the fast reply to my last question I am trying it again. I am very suprised I couldn't find a previous post asking the same thing, because it appears to me to be a standard feature I am looking for: I have four stimuli. I want the order of the stimuli randomized per subject at the beginning of the experiment (counterbalancing between subjects). Then I want to use the same order of stimuli at various points of the experiment. So lets say I have four stimuli: <item Simuli_Portraits>
/1 = "flower1.jpg"
/2 = "flower2.jpg"
/3 = "flower3.jpg"
/4 = "flower4.jpg"
</item>
I could call a specific item in "picture" using select:
<picture Portrait1>
/ items = Simuli_Portraits
/ select = 1
</picture>
All I would need is a shuffeled array of numbers that I could call one by one via select, let's say
/select = order_stimuli(1), where order_stimuli is a random order of the numbers 1-4
I can also create a sequence of numbers via list:
<list order_stimuli>
/ items = (1,4)
/ selectionmode = random
/ selectionrate = experiment
</list>
Yet, what I don't understand is whether this really provides me a list of numbers or only one number. All I need is a function that shuffles an array of numbers, in which I can call the x-th element of the array.
I was also thinking about some workaround methods:
1. Manually creating all possible orders (a list of items with all combination "1234", "1243, "1324", ..., "4321") as randomly choosing one. Here again I have the problem that I don't know how to call the x-th element of the string/number/array for select in the picture function.
2. Using some complicated randomization with branches at the beginning of the experiment to create a randomized order in items, also not having a clue how that could work.
I am very much into the logic of (dynamical) indexing that I might miss the very obvious solution on how to keep randomization consistent throughout multiple blocks of the experiment. Thank you for your help!
What you do is this: Have one <list> containing the values 1 to 4 set to random selection. Have another empty <list> set to sequential selection. Sample four values from the 1st list /onexptbegin and store them in the empty list. You now have a fixed randomly generated sequence which you can use for selection as needed. In a nutshell: <list rand> / poolsize = 4 / selectionrate = always / selectionmode = random / replace = false </list> <list fixedseq> / selectionmode = sequence </list> <expt> / onexptbegin = [ list.fixedseq.appenditem(list.rand.nextindex); list.fixedseq.appenditem(list.rand.nextindex); list.fixedseq.appenditem(list.rand.nextindex); list.fixedseq.appenditem(list.rand.nextindex); ] / blocks = [1=myblock] </expt> <block myblock> / trials = [1-16 = mytrial] </block> <trial mytrial> / stimulusframes = [1=mytext] / validresponse = (57) </trial> <text mytext> / items = myitems / select = list.fixedseq.nextvalue </text> <item myitems> / 1 = "A" / 2 = "B" / 3 = "C" / 4 = "D" </item> Hope this helps. Oh, and if you have several fixed orders you wish to counterbalance between subjects, you can do this like so, by essentially nesting lists: <list orders> / items = (list.order1.nextvalue, list.order2.nextvalue) / selectionmode = values.ordernumber </list> <list order1> / items = (1,2,3,4) / selectionmode = sequence </list> <list order2> / items = (4,3,2,1) / selectionmode = sequence </list> <values> / ordernumber = 1 </values> <expt> / onexptbegin = [ values.ordernumber = 1; ] / blocks = [1=myblock] / subjects = (1 of 2) / groupassignment = groupnumber </expt> <expt> / onexptbegin = [ values.ordernumber = 2; ] / blocks = [1=myblock] / subjects = (2 of 2) / groupassignment = groupnumber </expt> <block myblock> / trials = [1-16 = mytrial] </block> <trial mytrial> / stimulusframes = [1=mytext] / validresponse = (57) </trial> <text mytext> / items = myitems / select = list.orders.nextvalue </text> <item myitems> / 1 = "A" / 2 = "B" / 3 = "C" / 4 = "D" </item> Sorry, in fact it does work, because I can call the x-th element of the list via list.fixedseq.x, for example list.fixedseq.2. Thank you very much!
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