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23 posts tagged with statistics *and* science.

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## Too Many Strata To Sample

I have multiple independent variables that I want to stratify my sampling across, but the result would be way more strata than I can sample. Is there a way to stratify across different character states for each independent variable without creating strata for the interactions of each? Example inside. [more inside]

## Non-academic career suggestions for Psychology PhD

I am considering leaving a tenure-track faculty position in Psychology in order to have a more normal life. I would be very grateful for suggestions on non-academic careers. More inside. [more inside]

## Probability distributions and their practical applications

I am looking for a resource that lists probability distributions and their common real-world applications. For example, I'd expect to see: Lognormal - daily returns in the stock market. Poisson - failure rates for mechanical equipment, ... [more inside]

## Citation, please.

Is there actual scientific research behind this oft-cited UI response time => human perception table? Or is it just "conventional wisdom." If not, I'd love to see the original research and know how it was conducted.

## OkCupid Blog RIP...

So I take it that the OkTrends blog was killed off after Match bought OkCupid. Where can I now get my regular fix of really interesting statistics presented at a level that the lay person can understand? (I already know about Nate Silver and xkcd's What If.)

## Fallacies and Errors in Inferential Statistics

I have recently been introduced to the concept of pseudoreplication as a mistake that people often make when using inferential statistics to evaluate treatment outcomes. My field (evolutionary and conservation biology) makes heavy use of inferential statistics, including techniques that are vulnerable to pseudoreplication, yet nowhere in my formal education have I been taught about how poor experimental design and lack of statistical rigor can lead to fallacies like this. My personal statistical proficiency is poor, but I am working to remedy that. To that end, could folks help me by identifying and ideally explaining whatever other potential pitfalls you can think of, and explaining how they can be avoided through careful experimental design and data-analysis?

## learn data science

I'd like to learn about data science. Things like predictive modelling, regression and classification and so on. What would be good books or online courses to start with?

## Counting the Elderly

"Fewer persons alive at 70 today survive until 90 than forty years ago." True or False? [more inside]

## Calculus? Is that it?

## Boltzmann brain teaser

In his TED talk, Sean Carroll very briefly discusses Feynman's explanation about how the universe we can see and experience is not a statistically lucky perturbation, before moving on to the rest of his lecture. In other words, Feynman seems to discount the "Boltzmann brain" hypothesis, that we're not just the ephemeral product of a lucky shuffle of a metaphorical box full of marbles. Can someone explain this to me in words other than Carroll's, i.e., what evidence Feynman was using to prove his argument?

## Non-academic jobs for a statistician/ecologist in Israel?

What are some non-academic jobs near Tel Aviv, Israel that would be a good fit for someone with training in statistics (MA) and ecology (PhD)? [more inside]

## Oompa Loompa doompadee doo I've got another puzzle for you

I am thinking about doing a study in my school that correlates diet with behaviour, what advice would you give me to ensure watertight data and conclusions? Any other interesting variables I could look at? [more inside]

## Rates of success?

Statistics question: is it possible to test sets of cumulative data for significant differences in rate? [more inside]

## Does chi-square work for this?

StatisticAnalysisFilter: I took (pretty close to) scientific observations of the general populace in a neighborhood for a few months (personal project, long story). I measured the number of people who had trait X (or did not have trait X) in two locations, A and B. Now, I want to test the statistical significance of these results. Is the chi-square test sufficient for this? Or is there a better option? [more inside]

## How to say "accuracy" and "precision" in Russian?

How to translate the scientific/statistical English words "accuracy" and "precision" into scientific/statistical Russian? [more inside]

## Bill Nye should be a Mefite.

What are some simple experiments that help explain complicated phenomena? [more inside]

## Shared human/lettuce DNA

"The DNA of humans and chimps is 98.4% identical." I've read that several places. I've also read "The DNA of all living things is 90% identical" and "The DNA of humans and lettuce is 16% identical." How could I find out which of those last two statements is correct? Or is the problem that I don't understand which part of the DNA is being referred to? (Frankly, I'm not that clear on DNA in the first place - I'd just like the right number.)

## How to best provide online usage statistics to content subscribers? Should I?

Tools for a scientific publisher to provide usage statistics for its subscribers? Is this a good idea? [more inside]

## Statistics book for bioscience / medicine?

Can you recommend a statistics book which is appropriate for the stats required for basic bioscience / clinical research? [more inside]

## Mad social scientist seeks statistical test...

StatsFilter: I want to compare quantitatively the results of subjecting two different groups of people, A and B, to two different "programs". Which statistical test do I use to see which "program" had a greater effect? [more inside]

## StatsFilter: Evidence challenging/contradicting conventional controlled/placebo trials?

StatsFilter: Evidence challenging/contradicting conventional controlled/placebo trials? [more inside]

## Why leave out that one error bar?

A statistics / scientific convention question. I've noticed in scientific journals that often when a set of data is presented with values normalized to one of the sample groups, and the value for that sample group is arbitrarily set to 1, 10, 100 or whatever, to simplify interpretation, the variability/error data for that one sample group is left out. Is there a good statistical reason for that or is it just some random convention with no good reason? [more inside]

## Theory vs Law?

In science, what is the difference between a theory and a law? Why is something called a law rather than a theory?

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