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Dennis Roberts
are done with it ... without paying ANY attention to
just looking at the data
my 2 cents worth
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> htt
act that you say "category" makes it sound purely
>discrete.
>
>Glen
>
>
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venturesome 7
does 0 = shy seems 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.
f stress ... one cannot say that about the food preferences in
terms of some underlying absolute liking or disliking of the foods
Dennis Roberts, 208 Cedar Bldg., University Park PA 16802
WWW: http://roberts.ed.psu.edu/users/droberts/dro
wed out by my boss for modelling the means of some 7-point
> > > semantic differential scales. The scales were part of a written,
> > > self-administered questionnaire, and were laid out like this:
> > >
> > > Not stressful 1__ 2__ 3__ 4__ 5__ 6__ 7_
of course, to be fair to the first jay .. could be simply that his boss did
not like semantic diff. scales ... AND, for none of the reasons the second
jay below said ...
it would be helpful if the first jay could give us some further info on why
his boss was so ticked off ...
At 09:39 PM 2/25
stem, "common sense", other values for the variable in
>the data set, or the values a case has on other variables.
>=========
Dennis Roberts, 208 Cedar Bldg., University Park PA 16802
WWW: http://roberts.ed.psu.e
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:
vers ... and you find a
difference, what does this necessarily have to do with contamination?
i 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
your tips,
>
>Holger Boehm
>
>
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inherent in the universe? all 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
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would have to wait another day
Dennis Roberts, 208 Cedar Bldg., University Park PA 16802
WWW: http://roberts.ed.psu.edu/users/droberts/drober~1.htm
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nnis. 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., University Park PA 16802
WWW: http://roberts.e
s idea is sound. I 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
> > '
this document and
the general thrust of it.
Feel free to pass the url along to students and others; copy freely and use
if you find this helpful.
Dennis Roberts, 208 Cedar Bldg., University Park PA 16802
WWW: http://roberts.ed.psu.edu/users/droberts/drober~1.htm
AC 8148632401
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 mak
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ortant because,
we have gotten lazy when it comes to this ... we 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
WWW: http://roberts
tp://greetings.lycos.com
>
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ney
>Dept. of Aero/Astro
>Stanford U.
>
>
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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
S, and archives are available at
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dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632
ives are available at
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> > =
> >
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the z table?
>
>Melady
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dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
http://roberts.ed.psu.edu/users/dro
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. experime
m ... or all of them and,
these various combinations of what you do might clearly produce varying results
_________
dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
http://robe
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
uot;The waters? What waters? We're in the desert."
>"I was misinformed."
>
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rently ... we can
is that not true for any set 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 sam
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dennis roberts, educational psychology, penn state university
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===
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dennis roberts, educational psychology, penn state university
208 cedar, AC 81486
tions for joining and leaving this list, remarks about the
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PROPRIATE MESSAGES, and archives are available at
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dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
http://roberts.ed.psu.edu/users/droberts/drober~1.htm
===
at:
<mailto:[EMAIL PROTECTED]>
_
dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
http://roberts.ed.psu.edu/users/droberts/drober
or joining and leaving this list, remarks about the
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dennis robe
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
archives are available at
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dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mai
some minitab files and other things are here
http://roberts.ed.psu.edu/users/droberts/datasets.htm
_
dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
http
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dennis roberts, educational psychology, penn state university
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SAGES, and archives are available at
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dennis roberts, educational psychology, penn state university
208 cedar, AC 814
learance kinds of bookstores
_________
dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
http://roberts.ed.psu.edu/users/droberts/drober~1.htm
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dennis roberts, educational psychology, penn state university
208 cedar, AC 814
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 .
ce of this error is (0.2)^2)/12 = .00 and standard deviation
>0.0578 . To calculate confidence limits for the 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 varian
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 th
INAPPROPRIATE MESSAGES are available at
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dennis roberts, educational psychology, penn state university
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PROTECTED]>
>wrote:
>
>=
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208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
http://roberts.ed.psu.e
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dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
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g statistic ...
and may 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
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dennis roberts, educational psychology, penn state university
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http://r
d which effects.
>
>--
>Karl L. Wuensch, Department of Psychology,
>East Carolina University, Greenville NC 27858-4353
>Voice: 252-328-4102 Fax: 252-328-6283
><mailto:[EMAIL PROTECTED]>[EMAIL PROTECTED]
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dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, ma
mailto:[EMAIL PROTECTED]>
_____
dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
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h the effects of the temperature
>treatment. In my comment I supposed and stated that probably this was
>the situation at hand. I have to admit that the original message is
>not entirely clear on this point.
==
dennis roberts, penn s
Vanishes/ (1938)
>
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==
rcelain type A ...
and the other 5 combinations...
3 by 2 design ... fully randomized ...
unless i am missing something
_
dennis roberts, educational psychology, penn state university
208 c
gt;My reply address is correct as is. The courtesy of providing a correct
>reply address is more important to me than time spent deleting spam.
>
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>the
) the general SHAPE of the
distribution of SCORES ... but grades are on top of scores and do NOT have
to conform to the shape of the distribution of scores
unless your semantics was equating the term grades with the term scores ...
_
... that
mtb prints out when doing tukey follow up tests? ...
_
dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
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/employment/edpsymeas.asp
This should also be posted at AERA.NET shortly
_
dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
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> http://jse.stat.ncsu.edu/
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==========
dennis roberts, penn state university
educational psychology, 8148632401
htt
tatistics books do?
>
>Ronny Richardson
>
>
>Ronny Richardson
>
>
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o students
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rks about
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dennis roberts, educational psychology, penn state university
20
,
send me a note at:
<mailto:[EMAIL PROTECTED]>
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marks about
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dennis roberts, educational psychology, penn
;
>
>But it's much easier than that. Biostatistics is simply statistics
>(design, descriptive, and inferential) applied to medical, basic
>biology, and public health problems.
well, one difference in bio stat is a strong emphasis on probability sorts
of problems ...
... you should do it in the landscape (horizontal) mode
_
dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
http://roberts.ed.psu.edu/users/droberts/drober~1.htm
asses (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~
ATE MESSAGES are available at
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dennis roberts, penn state university
educational psychology, 8148632401
http://roberts
like to again make a push for correct answers rising to the
approximate same level of importance as process ... we just cannot take
lightly the fact that when someone gets the wrong answer, saying that this
is not THAT important ...
there are many many situations where making a mistake in the ans
it could have
been an answer because of real knowledge or, just happens to be the right
answer that was arrived at (luckily for the examinee) through some faulty
process
_
dennis roberts, educational psychology, penn state universi
e Rideau Lakes, Ontario Canada
>
>
>
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A
population versus B population?
to seek an answer to the real question ... no notion of null has to even be
entertained
==
dennis roberts, penn state university
educational psychology, 8148632401
http://roberts.ed.psu.edu/users/droberts/drober~1.htm
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dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[E
really is any different
but, this is just my opinion
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208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
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=
the pooled
version 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?
=====
res did NOT have adequate ceiling ...
and, you are missing detecting the "more mastery" that some students
had over others
you might think they are equal but, clearly they are not
_________
dennis roberts, educational psychology, pe
test
to attempt to infer more is playing a sheer folly game
_____
dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
http://roberts.ed.psu.edu/users/droberts/drober~1.htm
==
VARIABILITY be
measured in your context?
perhaps the variance (ie, standard deviation) is not what you are after ...
_
dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
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nd remarks about
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==
dennis roberts, penn state university
educational psychology, 8148632401
http://roberts.ed.psu.edu/users/droberts/drober~1.htm
==
en that we have the direction of the results AND the p value ...
nothing else]
======
dennis roberts, penn state university
educational psychology, 8148632401
http://roberts.ed.psu.edu/users/droberts/dr
e original post ... about the
math background or what statistics courses (if any) students would have
under their belts ... when taking this masters level course?
this is important
_________
dennis roberts, educational psychology, penn s
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dennis roberts, penn state university
educational psychology, 8148632401
http://roberts.ed.psu.edu/users/droberts/drober~1.htm
true ... so, the notion
of doing a TEST to see if you retain or reject ... is rather stupid TOO
since, we know that the null is NOT exactly true ... before we even do the test
_________
dennis roberts, educational psychology, penn state univ
est ... "good" texts will enumerate the
assumptions 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 ce
22
>Phone: (858) 535-1661 Fax: (858) 535-1665
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dennis roberts, penn state university
educati
6310 Greenwich Drive; Suite 200
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>-Original Message-
>From: dennis roberts [<mailto:[EMAIL PROTECTED]>mailto:[EMAIL PROTECTED]]
&g
g more
meaning into the raw data is not one of them
==========
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educational psychology, 8148632401
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whether the distribution seems to be
symmetrical or skewed ...
==========
dennis roberts, penn state university
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e:
>During the last week in August, there was a lengthy thread on sci.stat.edu
>about problems with the probability and statistics questions in MCAS, the high
>stakes test required for graduating from a MA public high school.
_________
dennis r
something else as a defense ... then,
why give them THIS test in the first place?
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