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Dennis Roberts, 208 Cedar Bldg., University
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Dennis Roberts, 208 Cedar Bldg., University Park PA 16802
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Dennis Roberts, 208 Cedar Bldg., University Park PA 16802
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like if the answer is no ... then we might have a
bipolar scale ... if the answer is yes ... then we don't
It could be the use of the particular bipolars
not stressful and very stressful.
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Dennis Roberts, 208 Cedar Bldg
for the variable in
the data set, or the values a case has on other variables.
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AC 8148632401
sure is easy in minitab ... one can draw a very nice curve (it's easy but,
hard to post here) but, to make a distribution easy for viewing we can
MTB rand 10 c1; generated 10 values from
SUBC chis 4. a chi square distribution with 4 degrees of freedom
MTB dotp c1
Dotplot: C1
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see three variables here ... diversity of fish ... rivers ... level of
contamination (ie, where the gradients are different)
what are you trying to show impacts on what?
Dennis Roberts, 208 Cedar Bldg., University Park PA 16802
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distributions are human made ... in the sense
that WE observe events ... and, find some function that links events to
probabilities
all of mathematics ... and statistics too as an offshoot ... is made up
Dennis Roberts, 208 Cedar Bldg., University Park PA 16802
Emailto: [EMAIL PROTECTED]
WWW
start my students off with some
binomial expansion theory.
Alan McLean wrote:
This is a good idea, Dennis. I would like to see the sequence start with
the binomial - in a very real way, the normal occurs naturally as an
'approximation' to the binomial.
Dennis Roberts, 208 Cedar Bldg
start with
the binomial - in a very real way, the normal occurs naturally as an
'approximation' to the binomial.
Dennis Roberts, 208 Cedar Bldg., University Park PA 16802
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, we had some
cdc mainframe over in the next building and, we would go over and stick our
stack of cards through the slot .. and then come back the NEXT DAY ...
to pick them up ... we just hoped we hadn't put a , or other bad character
someplace and would have to wait another day
Dennis
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it's called the behrens-fisher problem ... there is nothing that says that
population variances HAVE to be equal
essentially what you do is to be a bit more conservative in your degrees of
freedom ... most software packages do this as the default ... or at least
give you the choice between
take the easy way out of
testing all possible paired comparisons when, it MIGHT be that NONE of
these are really the crucial things to be examined
Dennis Roberts, 208 Cedar Bldg., University Park PA 16802
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Dennis Roberts, 208 Cedar Bldg., University
here is one VERY simple example
the COV is the AVERAGE of the PRODUCTS of the deviations around the means
... of two variables
if the cov is + .. there is a + relationship between X and Y, if it is -,
there is a - relationsip between X and Y
X Y devX devY (devX)(devY)
10
/
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experimental design, whose basic principles are rather simple, is elegant
and if applied in good ways, can be very informative as to data, variables
and their impact, etc.
but, please hold on for a moment
when it comes to humans, we have developed some social policies that say:
1.
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dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
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and,
these various combinations of what you do might clearly produce varying results
_
dennis roberts, educational psychology, penn state university
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gee just a short question to answer!
here is one part of it
say you were interested in whether different teaching methods impacted on
how well students learned intro statistics ...
now, if we put our minds to it, there probably are 50 or more different
ways we could teach a course like
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dennis roberts, educational psychology, penn state university
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of results?
At 10:58 AM 1/11/02 -0500, you wrote:
On Fri, 11 Jan 2002, Dennis Roberts wrote:
if the polls used similar ns in the samples ... i disagree
now, if the white sample was say 600 and the black sample was 100 ... i
MIGHT be more likely to agree with the comment below
consider white
/
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at:
mailto:[EMAIL PROTECTED]
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dennis roberts, educational psychology, penn state university
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dennis roberts, educational psychology
some minitab files and other things are here
http://roberts.ed.psu.edu/users/droberts/datasets.htm
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dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
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/
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dennis roberts, educational psychology, penn state university
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http://roberts.ed.psu.edu/users/droberts/drober~1.htm
most stat packages have nothing to do with programming anything ... you
either use simple commands to do things you want done (like in minitab ...
mtb correlation 'height' 'weight') or, select procedures from menus and
dialog boxes
At 12:27 AM 1/8/02 +, Kenmlin wrote:
i don't know the
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average distance travelled
by each driver, the z statistic should be used.
this is pure speculation ... i have yet to hear of any convincing case
where the variance is known but, the mean is not
_____
dennis roberts, educational psychology, pe
At 03:42 PM 12/10/01 +, Jerry Dallal wrote:
Dennis Roberts wrote:
this is pure speculation ... i have yet to hear of any convincing case
where the variance is known but, the mean is not
A scale (weighing device) with known precision.
as far as i know ... knowing the precision
At 08:08 PM 12/7/01 +, J. Williams wrote:
On 6 Dec 2001 11:34:20 -0800, [EMAIL PROTECTED] (Dennis Roberts) wrote:
if anything, selectivity has decreased at some of these top schools due to
the fact that given their extremely high tuition ...
i was just saying that IF anything had
/
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dennis
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not really (even when perfect) suggest anything about HOW X, when
manipulated, PRODUCED the Y change that we see ...
thus, the use of r in this case as an index of how MUCH X CAUSES Y ...
is a statistical stretch
_
dennis roberts
emailto:[EMAIL PROTECTED]
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dennis roberts, penn state university
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this was
the situation at hand. I have to admit that the original message is
not entirely clear on this point.
==
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dennis roberts, educational psychology, penn state university
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dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED
... that
mtb prints out when doing tukey follow up tests? ...
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208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
http://roberts.ed.psu.edu/users/droberts/drober~1.htm
to conform to the shape of the distribution of scores
unless your semantics was equating the term grades with the term scores ...
_
dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED
/employment/edpsymeas.asp
This should also be posted at AERA.NET shortly
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... you should do it in the landscape (horizontal) mode
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, and public health problems.
well, one difference in bio stat is a strong emphasis on probability sorts
of problems ...
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dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
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that the bombardier is not just graded on process
___
dennis roberts, educational psychology, penn state university
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dennis roberts, penn state university
educational psychology, 8148632401
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(which is so common
these days) ... practical considerations enter that weigh perhaps more
heavily than pedagogic best practice
dennis roberts, penn state university
educational psychology, 8148632401
http://roberts.ed.psu.edu/users/droberts/drober~1.htm
answer that was arrived at (luckily for the examinee) through some faulty
process
_
dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
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as a later topic (and of course if we KNEW that populations had the
same variances, then the pooled version would be useful)
it seems to me that this same logic should hold in the case of differences
in proportions
comments?
==
dennis
/
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dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
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to be some
[even though it could be trivial]) there is between the proportions of A
population versus B population?
to seek an answer to the real question ... no notion of null has to even be
entertained
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are missing detecting the more mastery that some students
had over others
you might think they are equal but, clearly they are not
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dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED
VARIABILITY be
measured in your context?
perhaps the variance (ie, standard deviation) is not what you are after ...
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have the direction of the results AND the p value ...
nothing else]
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dennis roberts, penn state university
educational psychology, 8148632401
http://roberts.ed.psu.edu/users/droberts/drober~1.htm
that are made AND, will give you some mini capsule of the
impact of violations TO those assumptions
_
dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
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... is rather stupid TOO
since, we know that the null is NOT exactly true ... before we even do the test
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://www.pacific-science.com
-Original Message-
From: dennis roberts [mailto:[EMAIL PROTECTED]mailto:[EMAIL PROTECTED]]
Sent: Tuesday, October 09, 2001 1:52 PM
To: Wuensch, Karl L; edstat (E-mail)
Subject: Re: Standardized Confidence Intervals
dennis roberts, penn state university
educational
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dennis roberts
?
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...
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/DSmith/photos.html
http://www.civeng.carleton.ca/Exhibits/Tacoma_Narrows/ ... a little qt
movie is here too
-- Chris
Chris Olsen
George Washington High School
2205 Forest Drive SE
Cedar Rapids, IA
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dennis roberts, educational
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as follows:
Class A: 48.3 mu 63.8
Class B: 65.4 mu 80.9
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to describe uncertainty about a parameter value,
such as the mass of the hydrogen atom, since there's just one true
value for the parameter, not a sequence of values.
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group?
or, just that the null model is not very plausible
bottom line: is there any value added information imparted from the p value
other than a statement about the null?
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dennis roberts, educational psychology, penn state university
208
like to know it
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1
6 479.585 519.585 1
7 480.382 520.382 1
8 481.189 521.189 1
9 486.166 526.166 1
10 494.388 534.388 1
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dennis roberts, educational psychology, penn state university
208
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be ... and, if you have
evidence about size of error ... then, these CIs can say something about
the parameter (again, within some range) in face of only seeing a limited
sample of behavior
At 09:30 PM 9/26/01 +, Radford Neal wrote:
In article [EMAIL PROTECTED],
Dennis Roberts [EMAIL PROTECTED] wrote
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