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22 posts tagged with mathematics and statistics. (View popular tags)
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Chance of event with small sample size, based on larger related sample?

Can/how can one improve the estimate for a chance of an event with a small historical sample size by utilizing the chance of a related event with a large historical sample size? Example and half-assed guess inside. [more inside]
posted by Flunkie on Mar 20, 2014 - 16 answers

I'm having trouble understanding likelihood ratios and diagnostic tests.

I'm struggling to understand likelihood ratios (LR) in the context of diagnostic tests, and why a positive LR is influenced by the sensitivity of the test. [more inside]
posted by cacofonie on Aug 1, 2013 - 6 answers

Find standard deviation in Excel, but first develop a labor-saving trick

Help me with statistics and Excel. Especially help me if you know any labor saving methods. I want the median, mean and standard deviation for the average price of all items sold, but my spreadsheet-full-of-data doesn't tell me the price of each sale -- just the average price per store, and the number sold at that store. Something like this: [more inside]
posted by croutonsupafreak on Jun 21, 2013 - 10 answers

Economics for Mathematicians

Economics Mathematics: I have a Maths degree but lately I've become interested in Economics (Microeconomics and Macroeconomics) and have been reading some textbooks and classic texts and doing some online lecture courses on Economics. But find many of that the "handwaving" graphical "proofs" of economic theories lack a sense of mathematical robustness. Do more thorough mathematics for these ideas exist? Where can I find them? [more inside]
posted by mary8nne on Nov 16, 2012 - 9 answers

Is joint parameter estimation always strictly better than individual parameter estimation?

Is it true that it is always better to estimate parameters jointly, even when they are completely unrelated? [more inside]
posted by TheyCallItPeace on Feb 20, 2012 - 3 answers

How do you use paired comparisons to rank a large set of items?

What strategies give useful aggregate ranking information when asking people to pick a favorite between two items selected at random (or close to random) from a large set of possible items? [more inside]
posted by jsturgill on Oct 18, 2010 - 3 answers

What basic statistics concepts do I need to understand web analytics?

I'm registered for a Web Analytics class. A prerequisite is "Familiarity with basic concepts of statistics." I'm not a math person and never studied statistics. Which basic statistics concepts should learn before this class? Are there any comic books, videos, or fun resources that would help me learn? [more inside]
posted by valannc on Feb 3, 2010 - 11 answers

Help me sample accurately!

Please provide me with an *effective*, and statistically sound, table/chart listing suggested sample size guidance for associated population size [more inside]
posted by thankyoumuchly on Jan 14, 2010 - 11 answers

Rates of success?

Statistics question: is it possible to test sets of cumulative data for significant differences in rate? [more inside]
posted by rollick on Nov 4, 2009 - 9 answers

finding a good book is hard

I need a good statistics book! [more inside]
posted by Brennus on May 7, 2009 - 14 answers

Individual free choice but collective predictability?

Can someone explain why despite the fact that every one of these incidents occurs at a unique time and place, each involves a complex history of events and personal decisions leading to its very unlikely outcome, that the death toll on the roads year-on-year is so predictable? See here and here. [more inside]
posted by zaebiz on Dec 28, 2008 - 47 answers

Maximizing a function over orthogonal matrices

Maximizing a function over orthogonal matrices, or: solving polynomial order 2 systems. Help me out or point me to a better forum / listhost. [more inside]
posted by a robot made out of meat on Oct 26, 2008 - 15 answers

Obama assassination : 1 in 55?

Does the fact that the betting markets still give Hillary Clinton a 1 in 55 chance of being President in 2008, mean that that is a reasonable estimate of the chance that Obama is assassinated before the election? What else could justify those odds now?
posted by zaebiz on Sep 1, 2008 - 14 answers

Hey, are you my long lost tenth cousin?

What's the chance that we're related? [more inside]
posted by brandnew on Mar 16, 2008 - 17 answers

Past performance, future results, &c

Statistics-filter: I need to establish to what extent student performance on a particular standardized test is predicted by each of the following: GPA, standardized test scores and a couple of other miscellaneous numerical factors. How do I go about this? [more inside]
posted by perissodactyl on Mar 6, 2008 - 11 answers

SVM, HMM, and wavelets in bioinformatics

I'd like to learn about SVM, HMM and wavelet algorithms in their usage in bioinformatics. I have a somewhat rudimentary understanding of the underlying mathematics from Wikipedia and a couple other sources, but I find that a concrete demonstration of their application fleshes it out. Are there texts, software packages (preferably free) or papers you'd recommend that: 1) includes good starter problem sets, or; 2) demonstrates how these techniques are used in research applications (beyond "we used xyz here"). Thanks!
posted by Blazecock Pileon on Nov 24, 2007 - 7 answers

Statistics: tell me about r-square for nonlinear models

StatisticsFilter: Can someone explain - with examples - why R^2 (r-square) values are not appropriate for use with non-linear regression models. [more inside]
posted by jonesor on Jun 21, 2007 - 5 answers

Mathematicial inefficiencies of sports betting markets

Mathematicians, I've always suspected there is a real opportunity to exploit the inefficiencies of the online sports betting markets and amateur bettors and make serious money. Have you felt the same way or am I kidding myself? [more inside]
posted by vizsla on Dec 17, 2006 - 7 answers

Best Probabilty and Statistics textbook?

If you were to buy just one text on probability and statistics (and their applications) that covers the subjects in some depth (building from an introductory college level, through advanced undergraduate to a graduate level and perhaps further) and does a good job of making the basic concepts clear with solved examples (employing those drawn from actual research), which one would you choose?
posted by sk381 on Oct 17, 2006 - 2 answers

How do I process user ratings of content fairly?

How do I process user ratings of content without skewing results of items that have only been rated once? [more inside]
posted by Orkboi on Jul 10, 2006 - 19 answers

Find the right statistical test

Statistics problem: Suitable statistical test for data containing rankings of preference for men and women for 4 alternatives. (more inside) Help me extract some meaning from my data, please. [more inside]
posted by JeNeSaisQuoi on Dec 16, 2005 - 13 answers

What's the methodology for conducting national political polls in the US?

Are national political polls that make use of random sample populations adjusted to account for the differences in overall population distribution throughout the US (in other words, do national political pollsters typically use some methodology to appropriately weigh responses from poll respondents depending on whether they live in more densely or less densely populated regions)?
posted by all-seeing eye dog on Aug 3, 2005 - 9 answers

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