On Wed, 29 Nov 2000, Kathryn, alias <[EMAIL PROTECTED]>, wrote:
> Hi there, I am a student conducting an experiment about the McGurk Effect
> (where when a word is seen spoken while a different word is heard through
> headphones, the perceived word is an integration of the two). I am hoping
> to cue either the auditory word or the visual word before presenting the
> video and sound to see if that makes the word more detectable.
>
> My problem is that I will have to ask participants to select which word they
> hear from a choice of 3 - the auditory word, the visual word, and the McGurk
> integration. This therefore constitutes nominal data.
Non sequitur. The choice of words is nominal, indeed; whether your DATA
are nominal is another matter entirely. Supposing your sample size is
reasonablylarge, your DATA might comprise the proportion of respondents
who chose A, the proportion who chose V, and the proportion who chose
McGurk. That's three dependent variables, which can be viewed as
interval scale for large enough N (and can be treated by logistic
regression for whatever N), and for which you are interested in finding
out whether the proportion in each case is a function of your cuing
procedures.
> The only statistical test I can find to use on nominal data is a chi
> square, is this right?
In brief, no.
> My textbook says that I can only use a chi square if each participant
> only contributes one piece of data, and only participates in one
> condition, which is unrealistic in a study like this,
Depends on which kind of "chi square" analysis you're referring to.
> so can I use chi square, and if not, what should I use?
Sorry; no time for further comment just now. Perhaps one or more
colleagues will assist.
-- DFB.
----------------------------------------------------------------------
Donald F. Burrill [EMAIL PROTECTED]
348 Hyde Hall, Plymouth State College, [EMAIL PROTECTED]
MSC #29, Plymouth, NH 03264 (603) 535-2597
Department of Mathematics, Boston University [EMAIL PROTECTED]
111 Cummington Street, room 261, Boston, MA 02215 (617) 353-5288
184 Nashua Road, Bedford, NH 03110 (603) 471-7128
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