Re: Robust Regression and Excel for Stats

Hi Humberto, You have given an excellent simplified account of the usefulness of robust regression and followed it by whole hearted support for Excel uses in Statistics. It looks like you belong to a delta (in mathematical sense) group. Anyway, what do you think about the credibility of Excel

Excel2000- the same errors in stat. computations and graphics

Happy new year to all. I frequently use Excel2000 for graphic presentation, spreadsheet maths, simple nonlinear model fitting (using the Excel solver) with one or two parameters, and simulations. I thought Excel2000 corrected those errors found in the analysis tool pack and other in-built

Re: varinace

Hi Duane, I am interested to know who has derived these formulas (Is it you?) and what were the bases for the derivation? Siddeek Duane Allen wrote: Kelly [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi, I'm trying to calculate sample size using the

Re: Ninety Percent above Median

Hi Allen, There is a small error in the median explanation at your web http://ri.essortment.com/medianmiddlest_rtiy.htm Your note says: In the data set {2, 3, 4, 5}, the median value falls between the 2nd and 3rd value. We add these two values (2 + 3) and divide by 2. The median value of

Re: Lognormal error

Hi Stat. experts, I have a query on the formulation of lognormal errors for a simulation study. Suppose a lognormal observational error, E, is introduced to a deterministic model in the following way: Nobs = N predicted *E I read in a book that to make log(E) normally distributed with a

Re: probability definition

Hi Alex, Can you provide the definition of probability under each way? In other words, can you explain a little more on each way of defining probability? As it is, some of them are clear (e.g., Frequentist theory) and others are not clear to me. Thanks. Siddeek Alex Yu wrote: Probability

Re: Excel Graphics

Then, what is the use of EXCEL? Siddeek Jon Cryer wrote: The absolute best advice concerning the use of Excel for graphics (or for statistics for that matter) is: DON'T! The _majority_ of graph-types available in Excel should never be used for any purpose as they produce misleading

Re: Excel Graphics

in the right way. This is because EXCEL is more popular and easy to use. Cheers. Siddeek David Heiser wrote: - Original Message - From: "Shareef Siddeek" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Monday, January 29, 2001 12:53 PM Subject: Re: Excel Graphics Then, what

mortality model

Dear Stat gurus, Can someone tell me what is the appropriate stochastic (natural) mortality model for people. Thanks. Siddeek begin:vcard n:Siddeek;Shareef M. tel;fax:(907) 465-2604 Phone: (907) 465-6107 tel;work:P.O. Box 25526, Juneau, Alaska 99802-5526, U.S.A.

Re: Error in polls

Wolfgang, Even if we use a binomial prob. value of 0.5 (under null hypothesis), we will get 3.5% error at 95% CI. Maybe, they are rounding up to 4%! Siddeek Wolfgang Rolke wrote: Today the following polling results were given on cnn.com for the Presidential race: CNN/USA TODAY/GALLUP POLL

Re: Error in polls

Wolfgang, Even if we use a binomial prob. value of 0.5 (under null hypothesis), we will get 3.5% error at 95% CI. Maybe, they are rounding up to 4%! Cheers Siddeek Wolfgang Rolke wrote: Today the following polling results were given on cnn.com for the Presidential race:

Re: question about binomial distribution

p is not a variable, it is a parameter. Cheers. Siddeek Thomas Souers wrote: I have a question regarding basic statistics, and while it might seem foolish to some of you, I would greatly appreciate any help: Suppose a variable can assume two values, success ( 1, probability p ) or failure

Re: memorizing formulas

In this "code" era one has to memorize frequently used simple formulae (and codes) to be quick in doing things. Cheers. Siddeek dennis roberts wrote: we memorize defintions of terms don't we? most feel that is helpful ... so, same thing applies to many formulas too ... and, if one uses then

Re: memorizing formulas

In this "code" era one has to memorize frequently used simple formulae (and codes) to be quick in doing things. Cheers. Siddeek dennis roberts wrote: we memorize definitions of terms don't we? most feel that is helpful ... so, same thing applies to many formulas too ... and, if one uses then

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