if i understand correctly, your list object should really only need four rows:<br>one row for a trial that presents two digits, neither of which is the probe<br>one for a trial that presents two digits, one of which is the probe<br>
and one each for valid and invalid 6 digit trials.<br>then you just need to nest a list or two into this main list...<br>maybe have one nested list with all the possible number combinations for a 6 digit trial, and one with the possibilities for a 2 digit trial. obviously, the nested list with the 6 digit possibilities only needs to be nested on the two rows from which you're calling 6 digit trials, and the nested list of 2 digit possibilities only needs to be nested on the rows which are calling your 2 digit trials. set those nested lists to random w/o replacement, and set the weights on your 4 trial types within your main list such that you are sure to sample all the trial types from the nested lists.<br>
does that make sense?<br><br>ben<br><br><div class="gmail_quote">On Thu, Mar 6, 2008 at 8:14 AM, Nikos Konstantinou <<a href="mailto:nkonstantinou@gmail.com">nkonstantinou@gmail.com</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>Dear E-prime group,</div>
<div> </div>
<div>I 'd appreciate any help on this issue:</div>
<div> </div>
<div>I created an experiment which has two tasks. Task 1: participants hear over the headphones either two or six digits which they have to remember until the end of the trial. At the end of the trial, they see a single probe digit (visual this time) on the screen, which matches one of digits they heard at the beggining of the trial 50% of the times. </div>
<div> </div>
<div>One way of doing it is something like this:</div>
<div> </div>
<div>Weight Digit1 Digit2 Digit3 Digit4 Digit5 Digit6 ProbeDigit</div>
<div>1 [Digit:0] [Digit:1] [Digit:2] [Digit:3] [Digit:4] [Digit:5] [ProbeDigit:0]<br>1 [Digit:0] [Digit:1] [Digit:2] [Digit:3] [Digit:4] [Digit:5] [ProbeDigit:1]<br>1 [Digit:0] [Digit:1] [Digit:2] [Digit:3] [Digit:4] [Digit:5] [ProbeDigit:2]<br>
1 [Digit:0] [Digit:1] [Digit:2] [Digit:3] [Digit:4] [Digit:5] [ProbeDigit:3]<br>1 [Digit:0] [Digit:1] [Digit:2] [Digit:3] [Digit:4] [Digit:5] [ProbeDigit:4]<br>1 [Digit:0] [Digit:1] [Digit:2] [Digit:3] [Digit:4] [Digit:5] [ProbeDigit:5]</div>
<div>6 [Digit:0] [Digit:1] [Digit:2] [Digit:3] [Digit:4] [Digit:5] [ProbeDigit:6]</div>
<div> </div>
<div>A problem with this solution is that it results in a huge list of rows, one for every possible compination. </div>
<div>Although the experiment is working this way, I believe there is an easier and "smarter" way of doing this. Maybe using and InLine?</div>
<div> </div>
<div>Anybody can help?<br></div>
<div>Thanks in advance,</div>
<div> </div>
<div>Nikos</div><br>
<br>
</blockquote></div><br><br>
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