On Thu, Nov 12, 2009 at 7:00 AM, Susan Bosco <susanbosco86@yahoo.com> wrote:

> Dear sir,
> In the four parameter logistic model used in MEDME algorithm,
>
> ....

>
> What do the symbol "Ɛ" and parameters a,b,c,d signify?Could you kindly
> explain this formula?also,the reason for using the exponential form in the
> denominator instead of natural logarithm?
>
>
Hi, Susan.  If you do this in R, you can get the citation for the paper
which might contain an answer:

library(MEDME)
citation('MEDME')

Sean

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