Re: Frequency analysis

Posted by Garry Gelade on Apr 19, 2012; 9:26am
URL: http://spssx-discussion.165.s1.nabble.com/Frequency-analysis-tp5650112p5651345.html

The “correct proportion”  for the null hypothesis depends on how you define the null task.  This would be clearer if you had a control condition of some sort. E.g. where the original lists were unrelated to the stimulus words or were presented aurally as opposed to visually etc.

 

As you don’t have a control group, you are simply measuring a false alarm rate. It is 55% which means that there is a strong tendency for false memory to occur in the task you studied. You could test whether that rate differs significantly from rates obtained by other researchers in other tasks.

 

Garry Gelade

Business Analytic

 

From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of Rose, Fred
Sent: 18 April 2012 22:32
To: [hidden email]
Subject: Re: Frequency analysis

 

That is a definite issue – I’m not sure of the correct chance proportions would be.  For those not familiar with the task, participants read a list of words such as “moth insect wing bird fly bug cocoon color net” and ask recall or recognition.  The false memory occurs when a participant falsely remembers the critical word – in this case, “butterfly”.  I don’t think it’s correct to say that 50% is the correct chance proportion but I’m not sure what a correct value would be.  It is likely that a 55% false memory rate is higher than false alarm rate on a word list task where the list consists of unrelated words, but again, I’m not sure where to go with it.  The bottom line is that I would like to be able to claim that the 55% rate reflects a strong tendency for false memory to occur.   

On 4/18/12 1:49 PM, "Bruce Weaver" <bruce.weaver@...> wrote:

It sounds like you're looking for the binomial test.  It's not clear what
proportions you expect in the two categories by chance, but if it was 50%,
the command would look like this (where "recalled" is an indicator variable
for recall, 0=No, 1=Yes):

NPAR TESTS
  /BINOMIAL (0.50)=recalled
  /MISSING ANALYSIS.


HTH.



Rose, Fred wrote

>
> Frequency analysis
>
>
> This is one of those questions that seems so ridiculously simple that
> I&#8217;m embarrassed to ask it, but I&#8217;m drawing a blank.
>
> I&#8217;ve got nominal data (yes/no) from a sample of men and women doing
> a variant of the Roediger and McDermott False Memory paradigm. &nbsp;The
> yes/no responses relate to whether or not the individual indicated that
> they &#8220;remembered&#8221; a critical word that, in fact, was never
> presented (the study was more complicated than this, but I&#8217;m
> describing the specific analysis I&#8217;m working on now). &nbsp;The
> distribution is roughly 55% yes to 45% no. &nbsp;I am trying to figure out
> the proper test of whether this pattern deviates from chance.
> &nbsp;I&#8217;m not comparing men and women, but just over all whether
> this is a high rate of false recognition in the sample as a whole. &nbsp;
>
> Any kind soul willing to help a guy out?
>
> Thanks,
>
> Fred
> --
> Fredric E. Rose, Ph.D.
> Associate Professor of Psychology
> Palomar College
> 760-744-1150 x2344
> frose@
>
>
>
>
> ====================To manage your subscription to SPSSX-L, send a message
> to
> [hidden email] (not to SPSSX-L), with no body text except the
> command. To leave the list, send the command
> SIGNOFF SPSSX-L
> For a list of commands to manage subscriptions, send the command
> INFO REFCARD
>

-----
--
Bruce Weaver
bweaver@...
http://sites.google.com/a/lakeheadu.ca/bweaver/

"When all else fails, RTFM."

NOTE: My Hotmail account is not monitored regularly.
To send me an e-mail, please use the address shown above.

--
View this message in context: http://spssx-discussion.1045642.n5.nabble.com/Frequency-analysis-tp5650112p5650183.html
Sent from the SPSSX Discussion mailing list archive at Nabble.com.

=====================
To manage your subscription to SPSSX-L, send a message to
LISTSERV@... (not to SPSSX-L), with no body text except the
command. To leave the list, send the command
SIGNOFF SPSSX-L
For a list of commands to manage subscriptions, send the command
INFO REFCARD

--
Fredric E. Rose, Ph.D.
Associate Professor of Psychology
Palomar College
760-744-1150 x2344
frose@...

======= To manage your subscription to SPSSX-L, send a message to [hidden email] (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD