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.
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.
--
Rich Ulrich, [EMAIL PROTECTED]
http://www.pitt.edu/~wpilib/index.html
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