ranging opines about the range
Dear statistically-enamored, There was a question in my undergrad class concerning how to define the range, where a student pointed out that contrary to my edict, the range was "the difference between the maximum & minimum". I'd always believed that the correct answer was the "difference between the maximum & minimum plus one"; and irrespective of what the students' textbook and also SPSS said (when I ran some numbers through it) I thought that was the commonly accepted answer. I favor the "plus one" account as I feel that it balances out the "minus one" of degrees of freedom and thus puts the Tao correctly in balance. I asked a colleague who also came up with the same answer. Below in I and II are answers from internet sites that also agree. There are also however some sites that define it nakedly as "the difference between the maximum & minimum"; my theory is that the Evil SPSS Empire bought them off as part of their plan for world domination Finally, we have a waffler's answer in III below... Curious to hear what you think about this defining issue for our times. best, JR from http://www.cuny.edu/tony/edstat22.html I. Measures of Dispersion or Spread Range - is the difference between the highest and lowest values in a group of values plus one. For example, the range of the following group of values 60,70,80,90,100 is 41 and is calculated by subtracting the lowest value (60) from the highest value (100) = 40 plus 1 = 41. from http://www.uwsp.edu/psych/stat/5/CT-Var.htm#II1 II. Range As we noted when discussing the rules for creation of a grouped frequency distribution, the range is given by the highest score in the distribution minus the lowest score plus one. R = XH - XL + 1 from http://luna.cas.usf.edu/~rasch/stat.html III. Measures of Dispersion Range: The Inclusive Range is the highest score minus the lowest score in a distribution plus 1. If the highest score on an examination is 97 and the lowest score 65, the range is 33. The plus 1 correction captures the values from 97.49 to 64.50. The Exclusive Range is just the highest score minus the lowest score. In the above example 32. Jeff Rasmussen http://www.symynet.com website & graphic design quantitative software spirit of tao te ching paperback & taoism = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
WTC 9-11 stats show paranormal connection
>Subject: WTC 9-11 stats show paranormal connection (Report from Princeton U) > >http://noosphere.princeton.edu/ >please read and comment I'm not surprised by the results. The "materialistic" viewpoint that most extant science still clings to is clearly wrongheaded as shown by quantum physics as well as anticipated by numerous eastern philosophies. The implications of the work remind me of F Scott Fitzgerald's: "A universe of ineffable gaudiness spun itself out in his brain while the clock ticked on the washstand and the moon soaked with wet light his tangled clothes upon the floor. Each night he added to the pattern of his fancies until drowsiness closed down upon some vivid scene with an oblivious embrace. For a while these reveries provided an outlet for his imagination; they were a satisfactory hint of the unreality of reality, a promise that the rock of the world was founded securely on a fairy's wing." (from, The Great Gatsby) Jeff Rasmussen http://www.symynet.com website & graphic design quantitative software spirit of tao te ching paperback & taoism = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
for students (biology et al.) that hate numbers
Voltolini wrote: > Hi, I am biologist teaching statistics for biologists and I am > > very interested in to learn more about teaching strategies > > when the students hate numbers (like biologists!). > > One thing I recently did was divide the class into 6 groups of ~5 each. Each group got a baggy with different stuff: one was multicolored confetti, another was different types of pasta, another was different lenghts of twine that had an inverse relationship between lenght and color saturation. Their task was to Organize, Summarize, Describe, Graph and Present the results & also to make the results attractive via Graphic Design considerations. The class voted on who did the best job (I was quite surprised that the confetti group won since they had little to work with in terms of the complexity of the data set). At the end of the year after a couple such contests, I'll give the winners a prize... usually Godiva Chocolate. I have a similar exercise where teams are given a "Rube Goldberg" type exercise... some of the steps are recoding data, finding miscoded data, forming indices, etc and the last step of which is to calculate an F ratio. (For non-American, look Rube Goldberg up on the Internet to see what that means). I'll see if I can track down the text for that to post. I'm also working on a computer program called the Art of the Experiment that is very light on numbers, so that it will help gently ease numerphobics into the wild world of stats. More info on this anon. JR Jeff Rasmussen Welcome Home to Symynet http://www.symynet.com website development graphic design = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
No Subject
SUBSCRIBE EDSTAT-L Jeff Rasmussen = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Ich Bein Ein Eigenvector, Victor
Eigen means self. The terms eigenvector, eigenvalues, etc come from one method of generating these values, which is that they are self-reproducing; that is, they will stabilize on the correct value after a series of iterations. I wish I could recall the method that you use to start the iterations, but it eludes me JR Jeff Rasmussen Spirit of Tao Te Ching & Images of Taoismpsychology.iupui.edu/tao TAO TE CHING... the Book, the Song, the Miniserieswww.symynet.com Zen/Tao 10 Oxherding Pictures psychology.iupui.edu/ox/main.htm = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Re: Problem on the probability of death
I think the probability is 100%, see: http://www.theonion.com/onion3102/deathrate.html Jeff Rasmussen [EMAIL PROTECTED] = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Re: By trial, or by subject?
William Dunlap at Tulane has done some research on this. Do a lit search on his name. Jeff Rasmussen Spirit of Tao Te Ching & Images of Taoism http://psychology.iupui.edu/tao TAO TE CHING... the Book, the Song, the Miniseries http://www.symynet.com Zen/Tao 10 Oxherding Pictures http://psychology.iupui.edu/ox/main.htm = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Re: psychologist analyze thyself (was: psych test for Statistics)
Rich, You're right, I forgot to mention the biases! I'm on sabbatical so I must have forgotten (or repressed) that rather salient feature. >By the big ones: sex, race, social class, age, ethnicity. >By more subtle ones: >wealth, body language, speech accents, shopping habits. >And if you don't meet the fellow "first-hand," how will you >know if he might not give you the secret hand-shake? I'm a sucker for the secret handshake. JR /\ *||* ox*=||=*xo || Jeff Rasmussen, PhD "Welcome Home to Symynet" Symynet http://www.symynet.com Graphic Design Website Development Eastern Philosophies Software Quantitative Instructional Software = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
psychologist analyze thyself (was: psych test for Statistics)
> >There is a considerable literature on clinical judgment (i.e., >interview and human judgement) vs. actuarial predictions (i.e., >predictions from demonstrably valid regression equations ... >human judgment _might_ be used in producing individual predictor >scores, but not in aggregating them). In general, human judgment >does not fare all that well relative to actuarial (i.e., >statistical) methods. Interesting that someone posting to a >statistical newsgroup would advocate the non-statistical approach >to selection problems. > >Best wishes >Jim > This is a very good point, Jim. I'm curious if you, or others have noted the following irony. Psychology faculty know that the literature on the clinical judgement indicates it is very poor, yet in Search and Screen, Graduate Student admissions Graduate Student evaluations, most largely ignore this. When I'm on such committees I do a rank ordering based on whatever actuarial data is available and know that doing otherwise is just mucking around with error. Most other faculty haruspicate via predictors such as the "number of full professors who wrote letters of reference", "impression of the quality of their undergraduate school" or other voodoo. They are usually indignant when I point out that such variables add nothing above and beyond the actuarial data. Is there a difference between a psychologist and a psychic, I often wonder. JR /\ *||* ox*=||=*xo || Jeff Rasmussen, PhD "Welcome Home to Symynet" Symynet http://www.symynet.com Graphic Design Website Development Eastern Philosophies Software Quantitative Instructional Software = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Re: help with modelling
At 07:33 PM 12/15/00 -0600, Debraj wrote:
>hi,
>
>I have a set of data which indicates number of correct responses on a
>test (score) for 20 persons. I wanted to know if I can model the same
>mathematically based on certain factors, say Score = f(factor1,
>foactor2, factor3, factor4), so that I can simulate similar data with
>different values of the factors. How should I go about this ?
>
>thanks
>debraj
>
One approach: do a lit search using Monte Carlo and Factor Analysis on Psych Lit. That should come up with many citation that will give the details. The general approach is to write a computer program that generates random data with the specified intercorrelation matrices. It's standard practice to vary parameters such as sample size, number of variables, underlying populations and so forth. You run some large number of reps, say 10,000 and get averages, variances, etc.
JR
(btw, I used to do Monte Carlo simulations if you're interested in a consultant)
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Symynet http://www.symynet.com
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Re: rough translation of: Prognose des BSP anhand der Cobb-Douglas-Produktionsfunktion
Katja, Ich verstehe etwas Deutsches. Ich kenne nicht das Cobb-Douglas-Produktionsfunktion. Ist hier ein erster Versuch einer Übersetzung. Ich frage, daß jemand auf englisch das Cobb-Douglas-Produktionsfunktion beschreiben. Dann kann ich eine bessere Übersetzung geben. to the list, My German is rather poor, but below is a rough translation of the question. However, I'm not familiar with the Cobb-Douglas function, and don't know what BSP means. If someone can explain it, I can probably give a better translation. Katja writes: "I need to predict, as mentioned already in the Subject line, the BSP from the Cobb-Douglas function. The function requires work and capitalization (?) as input numbers. So my question is: what are the economic indices of these numbers, and what data can I use for these numbers." JR /\ *||* ox*=||=*xo || Jeff Rasmussen, PhD "Welcome Home to Symynet" Symynet http://www.symynet.com Graphic Design Website Development Eastern Philosophies Software Quantitative Instructional Software Ý'structions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ Ý=
