Hi, I am Biologist preparing a class on experiments in ecology including
a short and simple text about how to use and to choose the most commom
statistical tests (chi-square, t tests, ANOVA, correlation and regression).
I am planning to include the idea that testing the assumptions for
Voltolini wrote:
Hi, I am Biologist preparing a class on experiments in ecology including
a short and simple text about how to use and to choose the most commom
statistical tests (chi-square, t tests, ANOVA, correlation and regression).
I am planning to include the idea that testing the
At 12:59 PM 10/12/01 -0300, you wrote:
While consulting people from depts of statistics about this, a few of them
were arguing that these assumption testing are just a legend and that
there is no problem in not respecting them !
note: you should NOT respect any stat expert who says that there
Re robustness of the between-subjects ANOVA, I obtained
permission from Dr. Rand Wilcox to copy three pages from his book,
New Statistical Procedures for the Social Sciences, and place
them on a webpage for my students. He cites research showing that
with four groups of 50 observations each and
Lise advised I tell my students that the ANOVA is not
robust to violation of the equal variances assumption, but that it's a stupid
statistic anyway. All it can say is either, These means are may
be nearly equal, or There's a difference somewhere among these
means, but I can't tell you
At 01:44 PM 10/12/01 -0400, Lise DeShea wrote:
I tell my students that the ANOVA is not robust to violation of the equal
variances assumption, but that it's a stupid statistic anyway. All it can
say is either, These means are equal, or There's a difference somewhere
among these means, but I
A colleague of mine - not a subscriber to this helpful list - asked me if
it is possible for the standard deviation
to be larger than the mean. If so, under what conditions?
At first blush I do not think so - but then I believe I have seen
some research results in which standard
I had promised a colleague a story that illustrates probability and
now I forgot how to solve it formally. The story is about six
students who go off on a trip and get drunk the weekend before
their statistics final. They return a few days late and beg for a
second chance to take the final
Title: RE: Mean and Standard Deviation
Edward Dreyer writes:
A colleague of mine - not a subscriber to this helpful
list - asked me if it is possible for the standard deviation
to be larger than the mean. If so, under what conditions?
At first blush I do not think so - but then I
At 04:32 PM 10/12/01 -0500, you wrote:
A colleague of mine - not a subscriber to this helpful list - asked me if
it is possible for the standard deviation
to be larger than the mean. If so, under what conditions?
what about z scores??? mean = 0 and sd = 1
At first blush I do not think so
In article [EMAIL PROTECTED], Edward
Dreyer [EMAIL PROTECTED] wrote:
A colleague of mine - not a subscriber to this helpful list - asked me if
it is possible for the standard deviation
to be larger than the mean. If so, under what conditions?
Easily. Any highly skewed distribution will
Title: RE: Mean and Standard Deviation
Well, what
about the standard normal distribution: N(0,1)?
Dale N. Glaser, Ph.D.
Pacific Science
Engineering Group
6310 Greenwich
Drive; Suite 200
San Diego, CA
92122
Phone: (858)
535-1661 Fax: (858) 535-1665
http://www.pacific-science.com
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