K-Means QuickClusteranalysis (OptimalSolution)

Hello, i look for a good way to find the optimal number of cluster for a special problem ! Is it right to sum the distanceValues^2 and look for the point where these sumOfEuclideanDistance have the most lost from one to the next ClusterSolution ? P.S. I hope my english is not to bad ;-(

optimal sample size

Hi I am interessted in the question of optimal sample size in general, not for a special statistical technique. My questions: (1) What do I have to keep in mind if I compute optimal sample size, what is relevant? (2) What are the classic studies and who has highly influenced the subject? (3)

Re: optimal sample size

of course. the most important issue is ... what do you mean by optimal? if you can specify what the purpose of the sampling project is ... the parameter to be estimated, within what margin of error, etc. ... then you might be able to answer the question ... what is the MINIMAL n needed to

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Re: What is a confidence interval?

Ronald Bloom wrote: Jerry Dallal [EMAIL PROTECTED] wrote: John Jackson wrote: this is the second time I have seen this word used: frequentist? Since Radford Neal has already given an excellent explanation, let me add... A roulette wheel comes up with a red number 10 times in a

They look different; are they really?

Another instructor and I gave the same exam to our sections of a course. Here's a summary of the results: Section A: n=20, mean=56.1, median=52.5, standard dev=20.1 Section B: n=23 mean=73.0, median=70.0, standard dev=21.6 Now, they certainly _look_ different. (If it's of any valid I can

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Re: Help for DL students in doing assignments

Dr. Fairman wrote: Dear DL Students, What's a DL student? Jon Miller = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at

Re: optimal sample size

On Mon, 1 Oct 2001 12:23:28 +0200, Bernhard Kuster [EMAIL PROTECTED] wrote: Hi I am interessted in the question of optimal sample size in general, not for a special statistical technique. (a) There was a notable 1974 article on Believability when N=1 and here is an academic webpage on the

Re: They look different; are they really?

Stan Brown wrote: Another instructor and I gave the same exam to our sections of a course. Here's a summary of the results: Section A: n=20, mean=56.1, median=52.5, standard dev=20.1 Section B: n=23 mean=73.0, median=70.0, standard dev=21.6 Now, they certainly _look_ different. (If it's

Re: They look different; are they really?

were these two different sections at the same class time? that is ... 10AM on mwf? if not ... then there can be all kinds of reasons why means would be this different ... nonewithstanding one or two real deviant scores in either section ... could also be different quality in the instruction

Re: They look different; are they really?

Be careful of the move from data to conclusion! You say whether one class really is learning the subject better than the other, and by how much? Even assuming the test yields a good measure of how well the students know the material (which should be investigated, rather than assumed), it isn't

Re: Help for DL students in doing assignments

Jon Miller [EMAIL PROTECTED] writes: What's a DL student? Distance Learning, I'd imagine. -- Rich Carreiro[EMAIL PROTECTED] = Instructions for joining and leaving this list and remarks about the

Re: Help for DL students in doing assignments

Dear DL Students, I have Ph.D. degree in mathematics, physics, electrical engineering, computer science. Can you please post details of your 3 PhDs! Nim. = Instructions for joining and leaving this list and remarks about

Re: optimal sample size

what is the MINIMAL n needed to accomplish these ends ... that might be optimal if you are looking for the smallest n you can get by with ... but, optimal does not have to be defined as such ... Thanks for your comments. To be honest, for me the term opitmal (which seems not to be a very good

Re: optimal sample size

I think I am trying to say, gently, that your basic question doesn't make very good sense to me; and it did not, to Dennis, either. Optimal is one problematic word. Another problem is that you seem to ask about all research, in all of the world It might be a clever way to attack

Logistic Regression vs Chi Square test in the following scenario

Hi I have a question to the group here. Let's say I have two variables: y is the dependent variable, x is the independent variable. X Y --- 0 1 1 1 1 1 1 0 0 0 0 1 1 0 1 1 etc etc. Both variables are binary and discrete. I want to see if there is a

semi-studentized residual

Hello, I have a question regarding the so-called semi-studentized residual, which is of the form (e_i)* = ( e_i - 0 ) / sqrt(MSE). Here, e_i is the ith residual, 0 is the mean of the residuals, and sqrt(MSE) means the square root of MSE. Now, if I understand correctly, the population simple

Re: Help for DL students in doing assignments

On Mon, 01 Oct 2001 16:51:27 GMT, Jon Miller [EMAIL PROTECTED] wrote: Dr. Fairman wrote: Dear DL Students, What's a DL student? distance learning student? = Instructions for joining and leaving this list and remarks about the