> On Fri, 7 Sep 2001 18:28:59 +1200, "Magenta"
> <[EMAIL PROTECTED]> wrote:
>
> [ snip, quoting ]
>
> > My understanding of the use of visual analog scales is that only the
anchors
> > are labelled - so that you have a line like so:
> >
> > strongly disagree
> > strongly agree
> > |_______________________________________|
> >
> > And you make sure that the line is easily divisible (e.g. make it 10 cm
> > long) so that you measure where the respondent's line response cuts your
> > line. I was also under the impression that this constructs a ratio
scale as
> > you can perform mathematical operations on the distance and your left
hand
> > anchor constitutes the zero point. My example above may not be ideal
for
> > demonstrating this, I was wanting to work with your illustration.
"Rich Ulrich" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> I can imagine a visual analog item with labels that would
> help the user define a ratio scoring
>
> I can't imagine using the labels "strongly disagree/agree"
> while fixing one end as zero, to get a ratio scale; that just
> seems like a purely bad idea.
>
> Michelle, I hope that you now know that you got tangled up in
> hypothetical illustrations which you now regret.
Sure do, I think that if you redid it so that the scale was now:
don't agree
strongly agree
|_______________________________________|
that would give you a ratio scale between no agreement and strong agreement.
You would then be able to use, e.g. ANOVA, on your test results, which would
be numeric in millimeters.
cheers
Michelle <blush>
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