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Today' New York Times education column is the following appreciation of
the importance of statistics in primary and secondary math education.
Teachers, post it in your math department offices!
--
Statistics, a Tool for Life, Is Getting Short Shrift
November
The NY Times wrote:
It is no longer possible to serve competently on some juries
without more data skills than most college graduates have.
That's all right, there will always be one lawyer or the other who
doesn't *want* anybody to serve competently, and the competent juror
If the trend continues nationwide, this newspaper could someday report
that an apparently alarming cluster of cancer cases has arisen in an
innocuous normal distribution, and students will be able to explain to
their parents what that means.
The reporting of cancer clusters already happens on a
Kaplon, Howard wrote:
What many authors do, I believe, is employ the Law of Large
Numbers, and say that for n sufficiently large, the probability
approaches 0 that | sigma - s | is different from 0. That is
sigma and s may be interchanged with minimal probability of any
change. And so
Ronny Richardson wrote:
As I understand it, the Central Limit Theorem (CLT) guarantees that the
distribution of sample means is normally distributed regardless of the
distribution of the underlying data as long as the sample size is large
enough and the population standard deviation is
Focusing on designs that have resolution V or higher, your only two
options are a full factorial (you don't want that) and a half fraction
(2^{6-1}). If you six factors are A B C D E F, your design would have
32 runs and it will look like this:
StdOrdr A B C D E F
1
Dear Kathy,
You slightly confuse me with all that detail, but if what I get is
right, and that is that you have two continuous variables (one IV
one DV), then why don't you use a simple regression analysis? Is there
something I overlooked or does this appear to solve your query?
Best
Niko
Hi
On Tue, 27 Nov 2001, Thom Baguley wrote:
I'd argue that they probably aren't that independent. If I ask three
questions all involving simple algebra and a student doesn't
understand simple algebra they'll probably get all three wrong. In
my experience most statistics exams are better
Hi
On 25 Nov 2001, Herman Rubin wrote:
If it is a good test, ability should predominate, and there is
absolutely no reason for ability to even have close to a normal
distribution. If one has two groups with different normal
distributions, combining them will never get normality.
I think
in what way are the Q values (critical) and t ... connected?
someone pointed out that Q = t * sqrt 2 ... for example, doing a tukey
follow up test ... with 3 means and 27 df for mserror ... the critical (.95
one tail) value for Q is about 3.51 (note: the mtb output shows this cv of
3.51)
Hola!
I beleave the best reference for this topic is
Box, Hunter Hunter:
Statistics for experimenters. Wiley
Its newer books but not better ones. If youn cannot do with a standard
fraccional factorial, I could help out with D-optimal designs.
Kjetil Halvorsen
Eric wrote:
Does anybody
At 01:35 PM 11/28/01 -0600, jim clark wrote:
Hi
On Tue, 27 Nov 2001, Thom Baguley wrote:
I'd argue that they probably aren't that independent. If I ask three
questions all involving simple algebra and a student doesn't
understand simple algebra they'll probably get all three wrong. In
my
Hi everybody.
Who could help me to write an MS EXCEL application to simulate the GALTON
experiment.
Best regards for your time... from a very bad french english speaking !
=
Instructions for joining and leaving this list and
[EMAIL PROTECTED] (Eric) wrote in message
news:[EMAIL PROTECTED]...
Does anybody have any good pointers to the basics of fractional
factorial design in industrial context? I've got six factors with two
levels per factor for my predictor variable need to create an
experimental design which
Steve,
Its basically just a scaling of the score. Are you actually trying to
create your own scaled score? Or are you trying to calibrate a FICO (or
other model company) generated score based on your own observed portfolio
bad rate?
The phrase you used is usually stated: 2% bad rate (or 49:1
Hi
On 28 Nov 2001, Dennis Roberts wrote:
At 01:35 PM 11/28/01 -0600, jim clark wrote:
The distribution of grades will depend on the distribution of
difficulties of the items, one of the elements examined by
psychometrists in the development of professional-quality
assessments.
unless
Rich Strauss [EMAIL PROTECTED] wrote:
:If the trend continues nationwide, this newspaper could someday report
:that an apparently alarming cluster of cancer cases has arisen in an
:innocuous normal distribution, and students will be able to explain to
:their parents what that means.
: The
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