Re: probability definition

2001-03-03 Thread Richard A. Beldin
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Re: basic stats question

2001-03-02 Thread Richard A. Beldin
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Re: probability definition

2001-03-02 Thread Richard A. Beldin
ely flawed because we have not made the experiment clear. Continue to question the simple examples. You will learn from it. --3C6331B8C260BF767681A8B3 Content-Type: text/x-vcard; charset=us-ascii; name="rabeldin.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for

Re: Bg/Time data extrapolation?

2001-02-22 Thread Richard A. Beldin
it Content-Description: Card for Richard A. Beldin Content-Disposition: attachment; filename="rabeldin.vcf" begin:vcard n:Beldin;Richard tel;home:787-255-2142 x-mozilla-html:TRUE url:netdial.caribe.net/~rabeldin/Home.html org:BELDIN Consulting Services version:2.1 email;inter

Re: p values

2001-01-31 Thread Richard A. Beldin
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Re: p values

2001-01-29 Thread Richard A. Beldin
ard "Other things being equal...". --152074D07C4F46BEF5496A61 Content-Type: text/x-vcard; charset=us-ascii; name="rabeldin.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for Richard A. Beldin Content-Disposition: attachment; filename="rabeldin.

Re: Help Log-Probit in Excel

2001-01-25 Thread Richard A. Beldin
. :-) --46D0737844C9CF0BEDE1D80F Content-Type: text/x-vcard; charset=us-ascii; name="rabeldin.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for Richard A. Beldin Content-Disposition: attachment; filename="rabeldin.vcf" begin:vcard n:Beldin;Richard tel;home:787-255-2142

Re: Help Log-Probit in Excel

2001-01-24 Thread Richard A. Beldin
eliminate some confusion. --ECCA490F99BC503A5BC927C1 Content-Type: text/x-vcard; charset=us-ascii; name="rabeldin.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for Richard A. Beldin Content-Disposition: attachment; filename="rabeldin.vcf" begin:vcard

Re: I dont know what the question is asking me? Please HELP!

2001-01-23 Thread Richard A. Beldin
is commonly used by people who like to inflate their syllable count. :-) --82BC8D92CC03F9E9B6B85561 Content-Type: text/x-vcard; charset=us-ascii; name="rabeldin.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for Richard A. Beldin Content-Disposition: attachmen

Re: Excel Histograms

2001-01-23 Thread Richard A. Beldin
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Re: conditional probability

2001-01-20 Thread Richard A. Beldin
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Re: Problem on the probability of death

2001-01-17 Thread Richard A. Beldin
groups. Presumably, if the treatment is effective, the treated subjects will survive longer than the controls. --6868FFBD26298125D6F02FAE Content-Type: text/x-vcard; charset=us-ascii; name="rabeldin.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for Richard A. Beld

Re: MA MCAS statistical fallacy

2001-01-12 Thread Richard A. Beldin
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Re: Scale on survey questionnaire

2001-01-05 Thread Richard A. Beldin
communications issue. --D59B8CE81F610975488820BF Content-Type: text/x-vcard; charset=us-ascii; name="rabeldin.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for Richard A. Beldin Content-Disposition: attachment; filename="rabeldin.vcf" begin:vcard n:Beldin;Richard t

Re: Scale on survey questionnaire

2001-01-04 Thread Richard A. Beldin
care" all are rather ambiguous, but ? catches the sense well, IMO. Dick --3937A5B7BBB144812A431A4E Content-Type: text/x-vcard; charset=us-ascii; name="rabeldin.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for Richard A. Beldin Content-Disposition: attachm

Re: Sex Ratio, part 2

2000-01-24 Thread Richard A. Beldin
Wolfgang: As I remember my course in demography many years ago, there were indications that the prenatal mortality was excessively higher in males than in females. An evolutionary argument would claim that whatever behavior equalizes (approximately) the birth ratio would be advantageous. The

Re: statistical event definition?

2000-01-19 Thread Richard A. Beldin
Well, we wouldn't try to analyze apples and autos in the same data set. :-) On the other hand, the similarity is sort of like what one requires for an efficient tabular data base. Whatever the sample space of events is, it should consist of events that we can think about together comfortably. If

Re: Conditional probability problem

2000-01-17 Thread Richard A. Beldin
The ambiguity is in the initial statement. "Given an offspring is affected" can mean 1) We know that the i'th offspring is affected and the statuses of the other m-1 are unknown 2) We know the status of all m offspring and exactly one is affected. 3) We know the status of all m offspring and x

Re: Occupation codes?

2000-01-14 Thread Richard A. Beldin
The US Department of Labor has some statistics that are presented by occupation code. Apart from the cultural bias towards a mid-twentieth century pattern of employment in the US, they are comprehensive. Kimon Spiliopoulos wrote: Dear all, I would appreciate any help on the following: I am

Re: grades approximated by multinomial?

2000-01-12 Thread Richard A. Beldin
There is no approximation if the students' grades are independent. The multinomial distribution only assumes independent trials and constant value of the p[i] parameters which sum to 1. Of course, a different class may have different values of the p[i], but that distribution will also be

Re: y2k confound

2000-01-08 Thread Richard A. Beldin, Ph.D.
That's how we get "self-fulfilling prophecies"! Actually, many companies are so stingy with their IT investment that some kind of "scare scenario" may have been necessary to get their attention. Seems a shame, but that's life in the corporate world. Managers don't really take their computers

Re: adjusting marks

1999-12-24 Thread Richard A. Beldin, Ph.D.
When my students asked me (as a class) to grade on a curve, I suggested the following alternative. "Place N chips in a can. Let them marked in the following way: 10%F, 20%D, 40%C, 20%B, 10%A. Let each student pick a chip and leave the class, certain of his/her grade." For some reason, nobody ever

Re: adjusting marks

1999-12-24 Thread Richard A. Beldin, Ph.D.
I also want to add a bit about my predjudices. In my seventeen years in industry, I rarely heard of anyone getting praise for "trying". The emphasis was on "results", even at the cost of some formal policies. However, in the twelve years I spent in academia, both before and after my industrial

Re: teaching statistical methods by rules?

1999-12-17 Thread Richard A. Beldin, Ph.D.
The question is: If you don't teach by rules, what will you use? In the Elementary Statistics course I used to teach, I had several different objectives. 1) Students should develop arithmetic reliability. 2) Students should learn how they can be tricked by statistical wizardry. 3) Students

Re: counting seeds

1999-11-30 Thread Richard A. Beldin, Ph.D.
Consider the mechanisms which reduce the number of live seeds. Hypothesis 1. Soil quality determines what proportion will germinate. Crowding reduces the share of the available nutrient resources per seed. Hypothesis 2. Predation by birds is more likely when the density is higher so that the

Re: Some elementary issues -

1999-11-23 Thread Richard A. Beldin, Ph.D.
The question of compatibility of two data sets is not answered by statistical tests. Two data sets are compatible if the "same procedure" was used for each. Any evidence of differences between the data sets is attributed either to differences between the material or differences between the actual