- Original Message -
From: Vincent Vinh-Hung <[EMAIL PROTECTED]>
To: David A. Heiser <[EMAIL PROTECTED]>
Sent: Friday, September 01, 2000 12:48 AM
Subject: Re: Skewness and Kurtosis Questions
> Dear Dr Heiser,
in article [EMAIL PROTECTED], christopher.mecklin at
[EMAIL PROTECTED] wrote on 8/29/00 8:05 AM:
> Ronny,
> Kurtosis is poorly defined in almost every elementary stat textbook around.
> "Tailedness" and "peakedness" are both components of kurtosis. It is
> impossible to adequately explain kurtos
- Original Message -
From: Glen Barnett <[EMAIL PROTECTED]>
To: David A. Heiser <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Friday, September 01, 2000 5:06 PM
Subject: Re: Skewness and Kurtosis Questions
> > >It is correct if you measure skewness in t
- Original Message -
From: David A. Heiser <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; Glen Barnett <[EMAIL PROTECTED]>
Sent: Friday, September 01, 2000 1:13 PM
Subject: Re: Skewness and Kurtosis Questions
> Barnett then goes on...
>
> > > Now, if
- Original Message -
From: Robert J. MacG. Dawson <[EMAIL PROTECTED]>
To: Glen Barnett <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Thursday, August 31, 2000 11:21 PM
Subject: Re: Skewness and Kurtosis Questions
>
> (2) Distinguishing between peakedness
- Original Message -
From: Glen Barnett <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, August 30, 2000 7:45 PM
Subject: Re: Skewness and Kurtosis Questions
In reply to Ronny Richardson's question.
> There's several problems.
> (i) mean-median
"Simon, Steve, PhD" wrote:
>
> In a message to EDSTAT-L, you wrote:
>
> >(3) The high-moment measures concentrate on extreme tails if these
> >exist, even though they may contain vanishingly few data. This is not
> >always what one wants - consider the St. Petersburg Paradox.
>
> Could you te
My $2E-2:
(1) There is something to be said for the mean-median definition of
skewness, as it uses only second powers and is hence more robust than
the third-moment definition. IIRC, the sampling distribution of sample
skewness (3rd power def'n) is rather wide.
I'm not sure what
Ronny Richardson <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Several references I have looked at define skewness as follows:
>
> mean > median: positive, or right-skewness
> mean = median: symmetry, or zero-skewness
> mean < median: negative, or left-skewne
christopher.mecklin <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> And as far as using EXCEL's help menus as a stat reference, well EXCEL 2000
> also claims the following about the two-sample t-test: "You can use t-tests
> to determine whether two sample mean
Ronny,
Kurtosis is poorly defined in almost every elementary stat textbook around.
"Tailedness" and "peakedness" are both components of kurtosis. It is
impossible to adequately explain kurtosis with just one component. A good
reference that discusses this in much more detail is:
DeCarlo, L
On Mon, 28 Aug 2000, Ronny Richardson wrote:
> Several references I have looked at define skewness as follows:
>
> mean > median: positive, or right-skewness
> mean = median: symmetry, or zero-skewness
> mean < median: negative, or left-skewness
He then gave two small (N = 20)
- Forwarded message from Ronny Richardson -
Several references I have looked at define skewness as follows:
mean > median: positive, or right-skewness
mean = median: symmetry, or zero-skewness
mean < median: negative, or left-skewness
- End of forwarded mess
- Original Message -
From: Ronny Richardson <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, August 28, 2000 4:10 PM
Subject: Skewness and Kurtosis Questions
> Several references I have looked at define skewness as follows:
>
> mean > median: positive,
There is more than one way to measure skewness, and with Fisher's
measure (based on the third moment about the mean), it is quite possible to
have mean > median with negative skewness or mean < median with positive
skewness. The magnitude of skewness needs to be considered in standardized
uni
Several references I have looked at define skewness as follows:
mean > median: positive, or right-skewness
mean = median: symmetry, or zero-skewness
mean < median: negative, or left-skewness
Now, if I enter the following data into Excel:
-125, -100, -50, -25, -1, 0, 0, 0
16 matches
Mail list logo
