Re: Transforming ratios

They are physiological rather than 'psychological' signals. The measures
are the peak-to-peak amplitudes of the responses elicited in a muscle by
brain stimulation. I guess the key point is that in different conditions
the responses can be suppressed (i.e., they are smaller than the control
responses) or enhanced (i.e., they are larger than the control responses).

Geoff Hammond


"Bob Wheeler" <rwheeler@xxxxxxxxx> wrote in message
news:435f73ac$0$8285$882e0bbb@xxxxxxxxxxxxxxxxxxxxxxx
> Geoff Hammond wrote:
>> I work with physiological signals where it's conventional to express the
>> size of signals obtained in diffrent experimental conditions as ratios of
>> signal size in a baseline condition. I routinely take log transforms of
>> the ratios before analysis but scarcely anyone else does. Am I being too
>> fussy?
>>
>> Geoff Hammond
>>
>> School of Psychology
>> University of Western Australia
>
> Give an example of a "psychological signal." Is someone twisting a dial to
> indicate sensory strength? If the upper end of the signal can be very
> large, then you are doing the right thing.
>
> --
> Bob Wheeler --- http://www.bobwheeler.com/
> ECHIP, Inc. --- Randomness comes in bunches.


.

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