<p class="MsoPlainText" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"><font face="Courier New">Dear Zach</font></span></p>
<p class="MsoPlainText" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"><font face="Courier New"> </font></span></p>
<p class="MsoPlainText" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"><font face="Courier New">This is exactly the sort of thing that nested lists are for.</font></span></p>
<p class="MsoPlainText" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"><font face="Courier New"> </font></span></p>
<p class="MsoPlainText" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"><font face="Courier New">Your TrialList should contain (in addition to your other attributes) an attribute for the ISI. This attribute should contain the name of an attribute in a nested listed e.g. [IstimI] and the name of the nested list should be placed in the Nested column.</font></span></p>
<p class="MsoPlainText" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"><font face="Courier New"> </font></span></p>
<p class="MsoPlainText" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"><font face="Courier New">There is a sample experiment that comes with E-Prime that demonstrates this. It also uses the 'colon' notation, which IMO complicates things and for your purposes you can ignore that part.</font></span></p>
<p class="MsoPlainText" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"><font face="Courier New"> </font></span></p>
<p class="MsoPlainText" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"><font face="Courier New">I think you'll also find more eloquent explanations on the archives of this mailing list and in the user forums.</font></span></p>
<p class="MsoPlainText" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"><font face="Courier New"> </font></span></p>
<p class="MsoPlainText" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"><font face="Courier New">Regards,</font></span></p>
<p class="MsoPlainText" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"><font face="Courier New"> </font></span></p>
<p class="MsoPlainText" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"><font face="Courier New">Tony. </font></span></p><br><br>
<div class="gmail_quote">On Wed, Nov 12, 2008 at 7:26 PM, Zach <span dir="ltr"><<a href="mailto:zachary.d.cohen@gmail.com">zachary.d.cohen@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><br>Hello All,<br> This is my first time posting but as a new user of EPrime,<br>reading this list serve has been immensely helpful over the past month<br>
and for that I thank you.<br><br>The problem I am currently grappling with is one of randomization. I<br>have a stop signal program that randomly (w/o replacement) presents<br>the user with 4 stimuli (goleft, goright, stopleft, and stopright),<br>
with each stimulus presentation separated by inter-stimulus-interval<br>(blank screen). I have these 4 stimuli as separate procedures under a<br>List that weights each of the four differently (more go trials than<br>stop). In between each stimuli presentation I am attempting to<br>
randomly (w/o replacement) select the ISI time from a weighted list<br>with five possible times (500ms, 750ms, etc).<br><br>My problem is that I cannot seem to get EPrime to randomly select both<br>without replacement in series. I need the program to run through<br>
exactly the same amount of each stimulus (goL, goR etc) and the same<br>distribution of ISIs (500ms, 750ms etc) while randomly selecting and<br>pair both w/o replacement. I can get it to do one but not the other,<br>and was wondering if anyone knew a way to effectively place two lists<br>
in a row, so that the program would choose randomly from one list and<br>then the other. Alternatively, would there be a way to have a list of<br>ISItimes that could be randomly accessed (w/o replacement) inside the<br>GoL GoR StopL StopR programs.<br>
<br>For example, the program would function as follows:<br>(P) TrialProcedure<br> - (L) TrialList (with weighted GoL GoR etc.)<br> - (P) GoL_procedure<br> - (Slide) Fix<br> - (Slide) ArrowLeft<br>
- (Slide) ISI [and here the ISI time could<br>randomly access this magical list and select the time interval]<br> - (P) GoR_procedure<br>END<br><br>I hope that my question isn't too long and that I explained everything<br>
adequately. If anyone has any ideas I would greatly appreciate your<br>help.<br>Sincere Thanks,<br><font color="#888888"> -Zach Cohen<br></font></blockquote></div><br>
<br>
--~--~---------~--~----~------------~-------~--~----~<br>
You received this message because you are subscribed to the Google Groups "E-Prime" group. <br> To post to this group, send email to e-prime@googlegroups.com <br> To unsubscribe from this group, send email to e-prime+unsubscribe@googlegroups.com <br> For more options, visit this group at http://groups.google.com/group/e-prime?hl=en<br>
-~----------~----~----~----~------~----~------~--~---<br>
<br>