Using random selection sample from one list as a second list

[Nick Edwards]

Hi all,

I'm trying to design a procedure in which E-Prime randomly selects and presents 6 samples from a list of 16, and then presents that same randomly selected sample of 6 stimuli in a second presentation. Is there a way of doing this either from the GUI or with some simple code? Basically, I want the script to "remember" its randomly selected subset, and then use it as the input for the next list presentation (re-randomizing the 6 samples, but still re-presenting the same 6). Maybe its possible to do this from within the same cycle, but I suspect it requires a second list?

Thanks in advance for your input!

[Cognitology]

Hiya,

This is similar to the question of last Friday (“RE: Selecting random mask and target sitmulus from seprate lists”). By having a list which randomizes the 16, another list can then reference specific rows. Thus, if attribute “AllSamples” holds 16 samples, and in one trial you select six samples, you can just keep referring to [AllSamples:1],  [AllSamples:2], [AllSamples:3], [AllSamples:4], [AllSamples:5] and [AllSamples:6]. As long as AllSamples isn’t re-randomized, these six will remain the same, even if you should randomize the order of these six.

Hope that helps.

Best,

Michiel

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[Nick Edwards]

Hello Michiel,

Thank you so much for your help! I looked back at the post you referenced, and tried something that didn't quite work--perhaps I misunderstood something in your response. Does what you propose require a nested list? In other words, if I wish to refer back to the randomly selected subset of a previous trial, do the two lists need a nested relationship, or can the second list sequentially follow and refer back to the first?

I tried a non-nested approach, but I can't figure out how to reference List 1 within List2. Assuming the procedure is the same, I tried entering [Attribute1:1], [Attribute1:2]… [Attribute1:6] into each row, but it creates a circular reference error. I am only able to refer to List1 if List1 is nested within List2, which seems backwards (and doesn't give me the desired result of simply re-presenting the same random sample generated from List1):

1) List2 (reference the same 6 randomly selected samples of List1): embedded load(?), random order selection, exits after 1 cycle of 6 samples
    Nested: List1
    Procedure: Proced1
    Attribute1: [word:1], [word:2]… [word:6]
    Attribute2: [image:1], [image:2]… [image:6]
        2) List1 (16 samples): embedded load, random selection, exit after 1 cycle of 6 samples
            Procedure: Proced1
            Attribute1 (word): W1, W2, W3… W16
            Attribute1 (image): I1, I2, I3… I16
                3) Proced1: for each word [Attribute1] present image [Attribute2]

But what I envisioned was something with a structure like this:
           
1) List1 (16 samples): embedded load, random order selection, exits after 1 cycle of 6 samples
2) Procedure1: for each word [Attribute1] present image [Attribute2]
3) List2 (reference the same 6 randomly selected samples of List1): embedded load(?), random order selection, exits after 1 cycle of 6 samples
4) Procedure1: same as above, referencing the attributes of just the 6 samples randomly selected from List1

The above doesn't work because I can't find a way of referring to the already-sampled items List1 from within List2. Do I need to do this from within individual slides?

My apologies if my explanations are unclear—I'm obviously still an E-Prime newbie!

Best,

Nick

[David McFarlane]

Nick,

Hmm, I read your question differently. So to
clarify, by "second presentation", do you mean a
second presentation during the same session, or
during a later session? If the former, you might
look at the Study-Recall example on the PST
website (requires registration & login). If the
latter, then with some effort you could use
inline code to write the first List contents to
an external .txt file, and then use Load Method
"File" to load that file into a List for the second session.

-----
David McFarlane
E-Prime training
online: http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter: @EPrimeMaster (https://twitter.com/EPrimeMaster)

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At 12/9/2014 11:39 AM Tuesday, Nick Edwards wrote:
>Hello Michiel,
>
>Thank you so much for your help! I looked back
>at the post you referenced, and tried something
>that didn't quite work--perhaps I misunderstood
>something in your response. Does what you
>propose require a nested list? In other words,
>if I wish to refer back to the randomly selected
>subset of a previous trial, do the two lists
>need a nested relationship, or can the second
>list sequentially follow and refer back to the first?
>
>I tried a non-nested approach, but I can't
>figure out how to reference List 1 within List2.
>Assuming the procedure is the same, I tried
>entering [Attribute1:1], [Attribute1:2]…

>[Attribute1:6] intto each row, but it creates a

>circular reference error. I am only able to
>refer to List1 if List1 is nested within List2,
>which seems backwards (and doesn't give me the
>desired result of simply re-presenting the same
>random sample generated from List1):
>
>1) List2 (reference the same 6 randomly selected
>samples of List1): embedded load(?), random
>order selection, exits after 1 cycle of 6 samples
> Nested: List1
> Procedure: Proced1
> Attribute1: [word:1], [word:2]… [word:6]

> Attribute2: [image:1], [imaage:2]… [image:6]

> 2) List1 (16 samples): embedded load,
> random selection, exit after 1 cycle of 6 samples
> Procedure: Proced1
> Attribute1 (word): W1, W2, W3… W16

> p; Attribute1 (image): I1, I2, I3… I16

> 3) Proced1: for each word
> [Attribute1] present image [Attribute2]
>
>But what I envisioned was something with a structure like this:
>
>1) List1 (16 samples): embedded load, random
>order selection, exits after 1 cycle of 6 samples
>2) Procedure1: for each word [Attribute1] present image [Attribute2]
>3) List2 (reference the same 6 randomly selected
>samples of List1): embedded load(?), random
>order selection, exits after 1 cycle of 6 samples
>4) Procedure1: same as above, referencing the
>attributes of just the 6 samples randomly selected from List1
>
>The above doesn't work because I can't find a
>way of referring to the already-sampled items
>List1 from within List2. Do I need to do this from within individual slides?
>
>My apologies if my explanations are unclear—I'm
>obviously still an E-Prime newbie!
>
> >Best,
>
>Nick
>
>
>On Wednesday, December 3, 2014 8:20:54 AM UTC-6,

>Michiel Sovijärvi-Spapé wrote:
>
>Hiya,
>
>This is similar to the question of last Friday

>(“RE: Selecting random mask and target
>sitmulus from seprate lists†). By having a

>list which randomizes the 16, another list can
>then reference specific rows. Thus, if attribute

>“AllSamples†holds 16 samples, and in one

>trial you select six samples, you can just keep
>referring to [AllSamples:1], [AllSamples:2],
>[AllSamples:3], [AllSamples:4], [AllSamples:5]
>and [AllSamples:6]. As long as AllSamples

>isn’t re-randomized, these six will remain the