Recently, there was an extensive discussion about how to analyze data
involving marijuana use and heart attacks. I just came across an interesting
study that shows how to do a rigorous analysis in a very similar situation,
the risk of heart attacks after sex.
The actual paper appears in JAMA, but
Paul Jones writes:
>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.
With all due respect, it might be worthwhile to look at something else
first. When you are trying to
[EMAIL PROTECTED] writes:
>I WOULD LIKE HELP ON FORMULATING DATA ON EXCEL THAT WOULD EXECUTE
>RANDOM NUMBERS WITHOUT REPEATING. I TRIED USING THE FOLLOWING FORMULA
>BUT IT REPEATS SOME OF THE NUMBERS: =RAND()*39. ONCE I ENTER THIS
>FORMULA A NUMBER SHOWS UP ON CELL A1 AND THEN I JUST DRAG TO OTH
Mike Tonkovich asks about sample size calculations. Part of his message
reads:
>In this survey that I plan on running, I'm going to ask 40 questions. Am I
to
>do this for every variable and take the maximum sample size needed to
>achieve the desired level of confidence or what?
Are all forty
Lisa DeShea writes:
>I would try a sunflower plot, which shows more "petals" for each additional
data
>point. Here's a link where you can download a SAS macro that should do it.
If
>you don't have SAS, then you could try a Google search for "sunflower
plots."
>
>http://www.math.yorku.ca/SCS/sasm
Stan Alekman writes:
>What is the physical significance or meaning regarding a manufacturing
process
>whose output over an extended period of time has the same value for the
>arithmetic, geometric and harmonic mean of a property, its purity, for
>example?
Exactly the same value? I suspect that
Donald Burrill writes:
>Thanks, Rich. My semi-automatic crap detector hits DELETE when it sees
>things like this anyway; but... did you notice that although SamFaz
>(or whoever, really) claims to cite a bill passed by the U.S. Congress
>he she or it is actually writing from Canada?
>
Dennis Roberts (and others) have made comments and raised questions about
group projects and competition. If you haven't already done so, you should
read a couple of books by Alfie Kohn about this:
Punished By Rewards: The Trouble with Gold Stars, Incentive Plans, A's,
Praise, and Other Bribes
a
[EMAIL PROTECTED] writes:
>"Analyte concentration levels less than the limit of detection
>were assigned a value equal to the detection limit divided by the
>square root of 2 for calculation of geometric mean values.
>
>There must be a simple reason for the sqrt(2), but I'm not seeing it.
>Can so
I've been too busy to participate in this heated, but interesting
discussion.
Not to sound naive, but isn't the group of 11 MIT Biologists supposed to be
a sample, because we are extrapolating to all science faculty at MIT? If we
are not extrapolating, then why all the debate. Proving that discri
Your pizza taste test seems simple enough to me, but I may be missing
something.
The binomial has four assumptions:
1. N trials of an experiment.
2. Two possible outcomes.
3. Probability of success is the same for each trial.
4. Trials are independent.
1 and 2 are trivial. Using subjects only
Jeff Goslin writes:
>Actually, the data is going to be used to train a neural
>net to simulate the operation of a pancreas.
>I use artificial intelligence methods to solve complex
>problems that normally require a very complex equation
>or human intelligence to resolve. I would *LIKE* to
>re
Debraj writes:
>Some data values in a particular experiment performed exhibits
>unexpected results. Looking into it, I found some explanations for the
>same. Can I add in some compensatory values/function to eliminate the
>bias caused in the data instead of redoing the experiment again (with
>cor
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