creating biplots from existing multivariate output

I have a question about creating biplots from *existing* output by PCA, canonical variates analysis (CVA) and correspondence analysis. Am I right in thinking that variable and object scores in correspondence analysis are scaled to the same space and so require no further treatment for producing

Re: area under the curve

Dennis Roberts wrote: unless you had a table comparable to the z table for area under the normal distribution ... for EACH different level of skewness ... an exact answer is not possible in a way that would be explainable Even if you specify level of skewness, an exact answer is still not

Verba Volant 31-01-02

Verba Volant 31-01-02, Every day a new quotation translated into many languages. _ Quotation of the day: Author - Elisa Félix English - only that which I have lost belongs to me for always Italian - soltanto ciò che ho perso mi appartiene per sempre Spanish - tan sólo lo que he

correlation of dependent variables

If I have 3 variables defined as follows: A, B as independent, uncorrelated values of 0 or 1 C defined as the logical AND of AB, such that C=1 if and only if both A B =1, and 0 otherwise. Example A=1, B=0 then C=0 A=0, B=1 then C=0 A=0, B=1 then C=0 A=1, B=1 then C=1 My question is, what is

Re: correlation of dependent variables

are you saying that you have variables X, Y, and Z ... and, X and Y are uncorrelated and, Z is the sum of X and Y? ... and you want to find the covariance (or r i assume) between X and Z? (or between Y and Z ... same difference) here is a hint if X and Y are independent, it is like having two

Re: cutting tails of samples

Harold W Kerster wrote: Look at minitab's trimmed mean. It is a Tukey (I think) invention w/5% chopped from each end, leaving the central 90%. For the high variance, high skew, common world, a good approach. Oh, yeah, especially when setting reserves. Or calculating premiums. Those

Re: how to adjust for variables

Hi On 30 Jan 2002, Wuzzy wrote: Anyway I'm currently going on the definition of adjusted for 1 2 and 3 as the following equation: adjusted variable=variable^-variable (where variable-hat represents the variable predicted by 1 2 and 3 in a multivariate equation and variable is just the

Re: correlation of dependent variables

The answer is E(CA)=EA*EB. This is why: You have C=A*B. Therefore, E(CA)=E((A**2)*B))=E(A*B)=EA*EB. The second to last equality holds because A**2=A, and the last one is correct because A and B are independent. Vadim [EMAIL PROTECTED] (John Smith) wrote: If I have 3 variables defined as

Re: Verba Volant 31-01-02 SPAM

Postmaster, Would you please tell your User that they have to stop sending their daily message to Usenet Newsgroups. Below are the headers, and the contents of what was received today, at sci.stat.edu. Rich Ulrich, [EMAIL PROTECTED] == headers and message (raw plus HTML plus encoded) Path:

Re: cutting tails of samples

Hola! But the original poster asked about trimming IN THE MARGINAL DISTRIBUTION with multivariate data --- and that is totally insane. If trimming should be used in regression settings , the residuals should be trimmed - as in Rousseuw and Leroy's LTS (least trimmed mean of squares), implemented

Sensitivity Analysis

I had a colleague (a biologist) ask me about sensitivity analysis. I am not familiar with the technique (above and beyond knowing that the technique exists). What books/articles/websites/etc. would be good sources for my colleague to learn about sensitivity analysis. Since he's a biologist

R-square parameter estimates

Hi all, My question, although probably basic to most of you, is: If you are comparing two models, why might the test variables parameter estimates be significant in the second case and not in the first yet the R-square is decreased. For example: Model 1 - Some time period y = x1 + x2 + x3 +

What Is This?:

I've started receiving messages like the following from the newsgroup. Is this a problem with the newsgroup or a problem with my mail program? Ronny Richardson At 02:02 PM 1/31/02 +0800, you wrote: Á貨ÅÆ01713»·±£ÐÍÍòÄܽº ²úÆ·½éÉÜ

RE: What Is This?: ????

I thought that these were sublime messages from Venus. I am receiving them too. Henry M. Silvert Ph.D. Research Statistician The Conference Board 845 3rd. Avenue New York, NY 10022 Tel. No.: (212) 339-0438 Fax No.: (212) 836-3825 -Original Message- From: Ronny Richardson

Re: What Is This?: ÒµÎñÁªÏµ

We (our systems administrator and I) have been mystified by the recent glut of these messages too. Most of them seem to come from Asian countries, so I presume the problem has something to do with the mapping of Asian character sets. I know there have also been lots of problems with spam and

Entropy of a Gaussian-mixed random variable

Hello! I am trying to find out if the following integral (given in mathematica notation) can be solved analytically. If anyone knows the answer to this I'd appreciate the help. f[y_]:=p*Exp[-y^2/(2*a)]/Sqrt[2*Pi*a] + (1-p)*Exp[-y^2/(2*b)]/Sqrt[2*Pi*b] Integrate[-f[y]*Log[f[y]] , {y, -Infinity,

Re: Verba Volant 31-01-02 SPAM

On Thu, 31 Jan 2002 10:37:13 -0500, Rich Ulrich [EMAIL PROTECTED] wrote: Postmaster, Would you please tell your User that they have to stop sending their daily message to Usenet Newsgroups. Below are the headers, and the contents of what was received today, at sci.stat.edu. Rich

Re: how to read excel data into sas

Eric Miller wrote: Dear Friends, I had difficulty reading huge excel data into sas. I tried the following code, but it always says physical file does not exist. I need your help. My code: === filename import dde 'excel|sheet1!r2c1:r379c15'; data xray; infile

Mean free distance?

Visualize a large cubic room, say 100 feet on a side. 1,000 ping pong balls will be removed from an urn and placed in the room via random drawings from a uniform distribution for the x, y, and z position. The balls will be held stationary in their assigned position by means unknown to us and of

Re: What Is This?: ÒµÎñÁªÏµ

All of these are from China. It can be read by Chinese browser. They are commercial advertisements. It is extremely irresponsible, and must be stopped. This list is not for junk mails such as these. Carl -- Ronny Richardson wrote: I've started receiving

Re: area under the curve

In article [EMAIL PROTECTED], Glen Barnett [EMAIL PROTECTED] wrote: Dennis Roberts wrote: unless you had a table comparable to the z table for area under the normal distribution ... for EACH different level of skewness ... an exact answer is not possible in a way that would be explainable

Those pesky unintelligible posts. ´«Í³µÄ¼ÒÍ¥×!!!!!!

In his Re: What Is This?: ÒµÎñÁªÏµ (1/31/2002) Carl Lee wrote: All of these are from China. It can be read by Chinese browser. They are commercial advertisements. It is extremely irresponsible, and must be stopped.This list is not for junk mails such as these. I certainly agree that said

Re: What Is This?: ÒµÎñÁªÏµ

A recent one had an email root address matching a Taiwan friend, so I infer they are coming from there. they have the same 'appearance' I find when looking at Chinese web pages, suggesting that yes, they are intended to be Chinese characters but mis-handled. Perhaps there is a short set of