but this fails to take into account (amongst other things) ... that the way
rich and poor tend to get increments to their salaries/earnings (as a
general rule) ... is due to some kind of a multiplicative constant ... that
is ... some % value is that amount that increments their salaries ...
over the years, under this arrangement ... the gaps between the top and
bottom will necessarily get larger and larger and larger ...
also, it is true that the highest paid will tend to get a larger % than the
lower paid ... though even if that were the same % ... the principle above
would still make the gaps larger and larger over time
but, even with that ... if you take two years ... and line up this year's
salaries of say 1000 including those from the top down to the bottom ...
and these same folks salaries next year ... there will not be a perfect
correlation (though this will be quite high) ... thus, there still will be
SOME regression to the mean that is ... if we isolate the top 50 ... and
the bottom 50 ... and look at their percentile ranks (or mean z scores)
from this year to next ... you will still see that the lower 50 have
relatively higher percentile ranks than they did the first year ... while
the top 50 will tend to have LOWER percentile ranks (or mean z scores) ...
so, RTM still happens ... EVEN if the uppers GAIN in salary over the ones
the bottom
At 05:07 PM 1/25/01 +0000, wrote:
>Avid regression-to-the-mean watchers may be interested to know that,
>according to yesterday's summary of the growing rich-poor divide
>(on teletext news), the current top 10% of earners have had
>a higher percentage increase in income over the past x years
>(for some x that I've forgotten) than have the lowest 10% of earners.
>
> -- Ewart Shaw
>--
>J.E.H.Shaw [Ewart Shaw] [EMAIL PROTECTED] TEL: +44 2476 523069
> Department of Statistics, University of Warwick, Coventry CV4 7AL, U.K.
> http://www.warwick.ac.uk/statsdept/Staff/JEHS/
>yacc - the piece of code that understandeth all parsing
>
>
>=================================================================
>Instructions for joining and leaving this list and remarks about
>the problem of INAPPROPRIATE MESSAGES are available at
> http://jse.stat.ncsu.edu/
>=================================================================
_________________________________________________________
dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
http://roberts.ed.psu.edu/users/droberts/drober~1.htm
=================================================================
Instructions for joining and leaving this list and remarks about
the problem of INAPPROPRIATE MESSAGES are available at
http://jse.stat.ncsu.edu/
=================================================================
