Re: Correlation Math Help

["carrslem" <carrslem@xxxxxxx>]

Thanks for the reply Rudolf.

Before receiving your answer, I conducted an experiment.  I generated two
data sets, one a simple sine wave (which oscillates above and below zero)
and the other the same sine wave but displaced upward by about double its
amplitude so that it was all positive.  I then generated a correlation
coefficient and, voila! - it was exactly 1.00.  I then modified one of the
sets so that both still had the same phase and wavelength but different
amplitudes.  Again the coefficient was exactly 1.00.

These results suggest that comparing two data sets one of which remains
always positive while the other does not is, in fact, OK and does not
introduce any error into the results.  Any comments?

Regards,
Carroll Slemaker


----- Original Message -----
From: "rudolf stricker" <lists@xxxxxxxxxxx>
To: <omega-list@xxxxxxxxxx>
Sent: Saturday, August 24, 2002 2:35 PM
Subject: Re: Correlation Math Help


> On Sat, 24 Aug 2002 11:06:19 -0700, "carrslem" <carrslem@xxxxxxx>
> wrote:
>
> >What is "rank correlation"?
> >
>
> If we want to know the correlation of two sets of data having positive
> and negative values (eg wins and losses), we first should calculate
> the ranks of both sets and then calculate the correlation of these
> ranks instead of using the original sets for correlation calculation.
>
> mfg rudolf stricker
> --
> | Disclaimer: The views of this user are strictly his own.
>