E-Prime data file

[Hank Jedema]

Thanks very much for the thorough explanation. I will do as suggested,
turn of the logging and explicitly log the values. Thanks again for
your help.

Hank

On Dec 2, 10:12 am, David McFarlane <mcfar... at msu.edu> wrote:
> Hank,
>
> Stock reminder:  1) I do not work for PST.  2) PST's trained staff
> take any and all questions athttp://support.pstnet.com/e%2Dprime/support/login.asp, and they
> strive to respond to all requests in 24-48 hours -- this is pretty
> much their substitute for proper documentation, so make full use of
> it.  3) If you do get an answer from PST Web Support, please extend
> the courtesy of posting their reply back here for the sake of others.
>
> That said, here is my guess...
>
> Suppose your program contains lines like this in the Procedure that
> runs B or C:
>
> c.SetAttrib "B.RT", B.RT
> c.SetAttrib "C.RT", C.RT
>
> i.e., it explicitly logs values for both B and C, even if only one
> gets presented.  Yes, *your* inline code may have If-Thens that log
> only one or the other, but if you have enabled logging from the
> Properties Pages of B and C, then that will defeat your inline
> If-Thens and both will get logged anyway.  Don't take my word for
> that, go look at the full generated code -- every time you enable
> logging for an object, you will find a set of c.SetAttrib commands
> immediately after that object runs, *plus* the same commands again
> just before the c.Log command at the end of the Procedure.  This
> redundancy is E-Prime's attempt to ensure that attributes have proper
> values at the times needed (but note that PreRelease can defeat this,
> see Chapter 3 of the E-Prime User's Guide).
>
> So what happens when a trial skips B?  Well, although attribute
> values do not survive from one Procdure run to the next, global
> variable and property values do survive.  So the *property* B.RT
> still has its value from the previous run of the Procedure.  Thus,
> 'c.SetAttrib "B.RT", B.RT' will set the *attribute* "B.RT" to the
> current value of B.RT, which still lingers from the previous run of
> the Procedure (follow?), and so that gets logged for the current trial.
>
> If that is the case, then the solution is merely to turn off logging
> from the Properties Pages of B and C, and do all logging explicitly
> in your inline code.
>
> -- David McFarlane, Professional Faultfinder
> "For a successful technology, reality must take precedence over
> public relations, for nature cannot be fooled."  (Richard Feynman,
> Nobel prize-winning physicist)
>
> At 12/2/2011 09:58 AM Friday, David Vinson wrote:
>
>
>
>
>
>
>
> >Hi Hank,
>
> >We have experienced something very similar in experiments with
> >contingent designs (skipping one or more data collection objects
> >depending on various characteristics of responses).
>
> >I'm sure someone else has a more elegant solution but we got around
> >this problem by adding inline code which set these variables to
> >impossible values (e.g. RT = -99) if a particular object was not run
> >on a given trial. Then we filtered such values out of any analyses
> >we conducted.
>
> >cheers,
> >david
>
> >On 02/12/2011 14:44, Hank Jedema wrote:
> >>Hi All,
>
> >>Here is something in the E-data file that seems problematic and
> >>puzzles me: In a stoptask I use a number of if - then scripts to
> >>present a sequence of stimulus slides. The script occurs just after
> >>each slide and dependent on the whether a response was received or
> >>that the slide simply timed out (i.e. reached the end of its slide
> >>duration), the script will advance the trial on to the next slide
> >>(let's say slide B if a response was received or slide C if no
> >>response was received. The issue that I am having is that when I log
> >>the response and onset time etc for slides B and C, the E-data file
> >>list values for all, even though the slide B and C are mutually
> >>exclusive. I would expect a "NULL" for the slide that was not
> >>presented, but instead if slide B was actually presented, it will list
> >>the values from a prior trial for slide C duration, slide C response
> >>etc, and vice versa. The program is is structured so that 2 nested
> >>lists specify the trial type and stimulus duration and the program
> >>properly runs the correct number of trials (300). In the E-data file
> >>each trial provides one line of data. What am I missing? Thanks very
> >>much for your help.
> >>Hank
>
> >--
> >David Vinson, Ph.D.
> >Senior Postdoctoral Researcher
> >Cognitive, Perceptual and Brain Sciences Research Department
> >University College London
> >26 Bedford Way, London WC1H 0AP
> >Tel +44 (0)20 7679 5311  (UCL internal ext. 25311)

-- 
You received this message because you are subscribed to the Google Groups "E-Prime" group.
To post to this group, send email to e-prime at googlegroups.com.
To unsubscribe from this group, send email to e-prime+unsubscribe at googlegroups.com.
For more options, visit this group at http://groups.google.com/group/e-prime?hl=en.