"Rich Ulrich" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> On Wed, 09 Jan 2002 08:33:41 GMT, [EMAIL PROTECTED]
> (Jukka Sinisalo) wrote:
>
> >
> > We have two pots with 25 plants each. After an identical treatment we
> > wait for a week, and then calculate how many of the plants died. We
> > repeat this "experiment" 20 times, so we end up with 20 pairs of
> > "survival percantages".
> >
> > We are interested in determining the accuracy/reliability of our
> > method. In other words if in the future we use just one pot of 25
> > plants, what will be the confidence interval of the result.
snip
> "transform the data" - is easy and apt.
>
> Compute the logit and use that in your modeling. With
> the difference of two of them, you have the "log Odds Ratio."
snip
Using logits is obvious, but log Odds Ratio is not, given the aim to use
only one pot in the future (not the difference of two). An estimate of the
sum of variance components within and between repeats will be required for
calculating the precision of a single result.
Jos Jansen
=================================================================
Instructions for joining and leaving this list, remarks about the
problem of INAPPROPRIATE MESSAGES, and archives are available at
http://jse.stat.ncsu.edu/
=================================================================
