On Tue, 19 Feb 2008 16:52:21 +0000 (UTC), Martin Kaffanke
<martin.kaffanke@[EMAIL PROTECTED]
> wrote:
> Hi there!
>
> I have 2 data sets from the same 20 items. One is made by myself, I
have
> 24 persons tested on the computer with this items.
>
> And there is another work where I have the data from, which used the
same
> items but on paper/pencil, where 47 persons were tested.
Okay. You have a test administered in two ways,
paper/pencil and on computer. You want to compare something.
>
> There are also correct answers to the 20 Items.
You want to compare whether one approach gets
better answers (assuming the groups were equivalent).
> Oh, and I have to say
> this are really small probabilities like .00001 and the scale for the
> answers was logarithmic.
"The scale of the answers was logarithmic" sounds like the
answers were quantitative. Rather than the usual, Right /Wrong,
they were graded by how far off they were, multiplicatively.
"really small probabilities like .00001" comes out of the blue,
and does not make any sense.
>
> Now I'd like to see if my computer test provides better results then the
> other one.
>
> How can I do that?
>
> I'm using R as statistic software. How can I compare this?
If you have a summary "Grade" for each person, as if these
were schoolroom tests graded from 0-100, you do a t-test on
24 versus 47 subjects.
If you don't have a grade, you have to create one.
Does that say enough?
--
Rich Ulrich
http://www.pitt.edu/~wpilib/index.html
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