Re: Probability Of an Unknown Event
Thanks Robert! WDA end - Original Message - From: Robert J. MacG. Dawson [EMAIL PROTECTED] To: W. D. Allen Sr. [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Sunday, June 17, 2001 6:35 PM Subject: Re: Probability Of an Unknown Event W. D. Allen Sr. wrote: It's been years since I was in school so I do not remember if I have the following statement correct. Pascal said that if we know absolutely nothing about the probability of occurrence of an event then our best estimate for the probability of occurrence of that event is one half. [snipped] = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Probability Of an Unknown Event
It's been years since I was in school so I do not remember if I have the following statement correct. Pascal said that if we know absolutely nothing about the probability of occurrence of an event then our best estimate for the probability of occurrence of that event is one half. Do I have it correctly? Any guidance on a source reference would be greatly appreciated! Thanks, WDA [EMAIL PROTECTED] end = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Re: Marijuana
There is medical research that shows marijuana is more lethal than tobacco regarding lung cancer. Maybe there is a correlation between lung cancer susceptibility and heart attacks? We know there is for tobacco! WDA end Paul Jones [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... There was some research recently linking heart attacks with Marijuana smoking. I'm trying to work out the correlation and, most importantly, its statistical significance. In essence the problem comes down to: Of 8760 hours in a year, 124 had heart attacks in them, 141 had MJ smokes in them and 9 had both. What statistical tests apply? Most importantly, what is the statistical significance of the correlation between smoking MJ in any hour and having a heart attack in that same hour? What is the probablity that the null hypothesis (that smoking marijuana and having a heart attack are unrelated) can be rejected? How reliable are the results from a dataset of this size? I'm not very literate in maths and stats - please help me out someone. I'm interested in this research from the perspective of medicinal marijuana. Thanks and take care, Paul All About MS - the latest MS News and Views http://www.mult-sclerosis.org/ = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Re: Ninety Percent above Median
A couple of colleagues have already pointed out how the statement you so scornfully cite might in fact be true; Well, we have already seen that to be the case with professional educators. However, for statisticians the definition of median is still that element or [ the mean of two adjacent elements ] of a population for which the parameter in question results in half the population being greater in value with the other half being less. Ninety percent refers to a decile of a population, not the median. The median is explained very simply at: http://ri.essortment.com/medianmiddlest_rtiy.htm WDA end . - Original Message - From: Donald Burrill [EMAIL PROTECTED] To: W. D. Allen Sr. [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Thursday, May 31, 2001 11:01 PM Subject: Re: Ninety Percent above Median On Thu, 31 May 2001, W. D. Allen Sr. wrote: Only from the education field do we hear the statement that over ninety percent of students ranked above the median! The statement was made on TV. (1) I take it that it was the keyword students that led you to suppose that the statement had anything to do with the education field (rather than, say, the field of study the students were pursuing). (2) The statement appears, however, not to have been made by any agency of the education field, but on TV -- by which one supposes you mean broadcast television. That's not education: that's entertainment. Or, possibly, news, or the deliberate distortion thereof. (3) A couple of colleagues have already pointed out how the statement you so scornfully cite might in fact be true; although whether in fact any such interpretation can be believed is impossible to tell, in the absence of any context. Donald F. Burrill [EMAIL PROTECTED] 348 Hyde Hall, Plymouth State College, [EMAIL PROTECTED] MSC #29, Plymouth, NH 03264 603-535-2597 184 Nashua Road, Bedford, NH 03110 603-471-7128 = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Ninety Percent above Median
Only from the education field do we hear the statement that over ninety percent of students ranked above the median! The statement was made on TV. WDA end = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Re: sample size and sampling error
Get all the samples you can afford! Text book recipes on determining sample size implicitly assume that all the elements of the population in question are selected randomly [ equally likely to be selected ]. Voluntary response to a mail-in survey means you will get only those samples that volunteer to respond, which means non-random selection. The non-respondents are also hunters but you won't hear from them. Generally the more samples the better in a mathematically imperfect world. Look at it this way, if everyone responded you would have sampled the entire population of hunters. So the closer to all hunters the better. Maybe you could think of a way to induce more of those potential non-responders to respond. Good luck WDA end Mike Tonkovich [EMAIL PROTECTED] wrote in message 3b0d107d_2@newsfeeds">news:3b0d107d_2@newsfeeds... Before I get to the issue at hand, I was hoping someone might explain the differences between the following 3 newsgroups: sci.stat.edu, sci.stat.cons, and sci.stat.math? Now that I've found these newsgroups, chances are good I will be taking advantage of the powerful resources that exist out there. However, I could use some guideance on what tends to get posted where? Some general guidelines would be helpful. Now for my question. We have an estimated 479,000 hunters in Ohio and we want to conduct a survey to estimate such things as hunter success rates, participation rates, and opinions on various issues related to deer management. The first question of course, is how large of a sample? [snipped] = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Re: a problem in probability
At www.statistics.com you will find a resampling software program that has been designed for problems just like yours. WDA end Neville X. Elliven [EMAIL PROTECTED] wrote in message 9dsv7u$jdno8$[EMAIL PROTECTED]">news:9dsv7u$jdno8$[EMAIL PROTECTED]... Ronghua Zhang wrote: Suppose there exist N distinct objects, each time get n objects out of them(these n objects must be different) and then put them back, keep sampling for k rounds, and at last, what is the probability of at least x distinct objects have been selected at least once? Look at the complementary event: what is the probability P that exactly N - x distinct objects have not been selected? Then the probability you seek is 1 - P . Yes, I'v already thought of that. But the complement probability is also hard for me. Can you help me? Let x be fixed; when you make one pick of n objects out of N distinct objects, what is the probability that none of N - x distinct objects has been selected? Replace the n objects, mix well, and pick again. What is the probability that none of those same N - x distinct objects has been selected? Repeat this procedure k times. = 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 me an idiot
Five different condiments, plus no condiments, means 6*5*4*3*2*1 = 720 distinct combinations. WDA end Abdul Rahman [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Please help me with my statistics. Question: If you order a burger from McDonald's you have a choice of the following condiments:ketchup, mustard , lettuce. pickles, and mayonnaise. A customer can ask for all thesecondiments or any subset of them when he or she orders a burger. How many different combinations of condiments can be ordered? No condiment at all conts as one combination. Your help is badly needed Just an Idiot@leftover = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Re: Correlation of vectors
If I remember correctly two vectors are independent if their cross product is zero. Check a vector analysis book for verification of this. WDA end "Peter J. Wahle" [EMAIL PROTECTED] wrote in message N%FA6.403$[EMAIL PROTECTED]">news:N%FA6.403$[EMAIL PROTECTED]... What can I tell about the relationship of two sets of experimentally derived vectors? Example: VectorAVectorB (-1,1)(-2,-1) (-2,0)(-2,0) (-2,1)(-1,0) (0,0)(0,0) (-1,1)(-1,0) ...... Each row is subject to the same conditions. I need to check for independence and need some sort of measure of correlation. = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Re: Statistical teaching/learning software
Go to www.resampling.com WDA end "Alan McLean" [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED]... Hi to All, I am at present trying to find sources of computer software, including web resources, for teaching and learning statistics. My interest is in question-and-answer software, the sort that is used for providing practice exercises with help, preferably more than just drill questions. My special interest is in the use of randomisation by these resources/tools/packages. I would appreciate it if people could tell me what they know of such. Thanks in advance, Alan -- Alan McLean ([EMAIL PROTECTED]) Department of Econometrics and Business Statistics Monash University, Caulfield Campus, Melbourne Tel: +61 03 9903 2102Fax: +61 03 9903 2007 = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ = = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
