I read your follow-up after replying to your first question. To answer this
one: you can't do an Anova on the raw scores on accuracy, because it's a
dichotomous variable. One of the assumptions in analysis of variance is that
your DV is measured on interval or ratio level. So in this case you HAVE to
use the sumscores/percentages/means on your 25 measurements of accuracy. Now
your DV can have 26 different values and it may be seen as a continuous
variable.
Sky
Jim Kroger heeft geschreven in bericht ...
>May I ask a followup? I think this may get better at the heart of my
>query. Suppose that instead of temperature, I use a measure of vision: if
>they correctly identify a letter a distance away they get a "1," otherwise
>a "0." I wish to use accuracy as the DV. I can calculate the percent of
>trials in each cell obtaining a "1" and use the resulting four percentages
>for each subject as the ANOVA data. Or, should I do an ANOVA on the raw 0s
>and 1s themselves? My intuition tells me the two are not the same, but I
>can not say why. (if necessary, a larger number can represent correct)
>
>Thank you,
>Jim
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