731 posts tagged with statistics.
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What statistical test or model do I use?

So I'm trying to find how two variables are related, and I have a mountain of data. [more inside]
posted by MisantropicPainforest on May 21, 2013 - 12 answers

ISO Educational Statistics: # of history students/faculty

Looking for statistical information on how many students study history at the B.A., M.A. and Ph.D. level in various non-US countries. [more inside]
posted by agent99 on May 9, 2013 - 1 answer

What happened to Kenya from 1998 or so to make its poverty rate rise?

So I'm going to Kenya in 5 weeks time for some work, and I'm meant to be briefing some colleagues (emphasis on brief) about some aspects of our work tomorrow. Something has leapt out at me, and I don't have the time to research it myself before presenting. [more inside]
posted by smoke on May 7, 2013 - 8 answers

How do you say "statistically significant" in your native language?

In English, scientists customarily use the word "significant" or "statistically significant" to refer to an effect that is distinguished from zero at a p < .05 confidence level. On the other hand, the word "significant" in non-technical English carries a connotation of being meaningful, important, or substantial; this creates confusion when researchers write about "a significant effect," since the effect might be significant in the statistical sense while being so small as to be insignificant in the common-English sense. In your native language, what word is used for "signficance" in the statistical context? Is the same word used outside the technical context, and if so, is it a word whose common meaning is something more like "detectable," more like "important," or something else entirely? In particular, does the confusion that arises in English also take place in your language?
posted by escabeche on Apr 24, 2013 - 5 answers

How much will SEM model fit vary if I only change the final variable?

I have five structural equation models that are identical except for the final outcome variable. Should I expect the model fit statistics to vary more than negligibly? [more inside]
posted by aaronetc on Apr 11, 2013 - 4 answers

Most Popular Men's Pants Colors?

I'm curious what the most frequently purchased colors are for regular, non-jean pants for men. I was discussing this with a colleague today, and guessed black and navy. I'm looking specifically for industry numbers or anecdotal evidence from those working in clothing manufacturing or sales. (I already guessed!) Thanks in advance.
posted by whitebird on Apr 5, 2013 - 3 answers

Should I go to grad school for a stats PhD, change jobs, or…?

Feeling a little stuck in my current job; unsure if I should go for the PhD or cross it off my list and change jobs. [more inside]
posted by un petit cadeau on Apr 5, 2013 - 16 answers

Are there statistical formulas that, unlike averages, account for skew?

I've been thinking about product ratings online. Product A and B both have an average rating of 4 stars. Product A is universally liked: every reviewer gave it 4 stars. Product B is the Twilight Series: lots of people love it (5 stars), but many 1 star reviews drags down the average to 4 stars. Other than displaying the rating distribution (# of 1 through 5 star reviews), are there well-known formulas that would give Product A a higher rating? I think what I'm asking about are weighted means, or some sort of formula that takes into account variance or skew. But rather than re-invent the statistical wheel, I was hoping some of you may be able to point out well-known examples of good weighted formulas, or research related to this question. Hope this is clear! Thank you!
posted by User7 on Apr 1, 2013 - 18 answers

Stupid SPSS question: proportions

I never use SPSS (I hate it like I hate nothing else, except perhaps Excel) but I must use SPSS for this problem. Normally I'd just use R and be done with it, but SPSS is necessary for this problem. How can I get a simple error bar plot from two proportions? [more inside]
posted by Philosopher Dirtbike on Mar 18, 2013 - 5 answers

Is there a name for this logical fallacy? It has to do with statistics.

The fallacy is assuming that statistic information about a thing is more relevant in dealing with a particular instance of that thing than available first-hand data. [more inside]
posted by CustooFintel on Mar 12, 2013 - 17 answers

Stats: is a set of values within a normal range?

I'm trying a analyse a set of biological data for a research project and I'm having trouble finding the appropriate statistical tests to use. [more inside]
posted by snoogles on Feb 12, 2013 - 3 answers

R Statistical Computing for Semi-Dummies?

StatFilter: Would anybody be able to recommend a good introduction to the statistical computing language "R" that a reasonably quantitatively-adept psychologist might be able to work through on his own? Something like a step-by-step book or textbook with exercises would be great to help me become more fluent in R. (My colleagues at work who use R are primarily computer scientists who either first learned MatLab or are brilliant autodidacts when it comes to learning different scripting languages, and thus don't have any suggestions; Googling has mostly proferred a somewhat obscurely structured guide from the R authors and lots of invocations to just learn on my own, somehow...). I've become familiar with how to do many individually useful tasks in data structuring and analysis, but I feel a bit like a very high-functioning tourist who has learned a lot of phrases to get around but who would be lost and mugged in an alleyway if I strayed off the beaten path.
posted by Keter on Feb 7, 2013 - 16 answers

How to compare longevity with productivity?

I have a Soundcloud account. I think it's among the better sound file sharing sites, but it can be a little pricey. I am regularly adding new content so I am always butting up against the file size limitations of my account. So, I want to have a way to look at the files in my account and decide which of them needs to go and keep the most productive ones. I want to be able to compare how long a file as been posted to number of times it has been viewed. I think that deleting a file based just on duration or views could be deceiving because I could delete an old account that is delivering consistent viewers while a new account that starts out fast could drag as time goes on. I can't tell that by just looking, so I need some help. Can I create something in Excel? I also have SPSS. Would creating crosstabs help?
posted by CollectiveMind on Jan 28, 2013 - 4 answers

"Safe" is so relative.

Best statistical resources for comparing crime by neighborhoods? [more inside]
posted by ohsnapdragon on Jan 26, 2013 - 9 answers

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?
posted by Scientist on Jan 26, 2013 - 5 answers

Weather, damn cold weather, and statistics

I'd like to estimate the number of days a year when the high temperature is likely to be below a particular threshold, e.g. below freezing. This turns out to be harder than expected. [more inside]
posted by jon1270 on Jan 24, 2013 - 9 answers

Educate me on these crime statistics

The Wikipedia page on statistics about rape shows a very high crime rate for countries like UK, US and Australia in stark contrast to, say, India. The gap can't be explained simply by under-reporting, as that exists in all these countries (even assuming different rates of under-reporting). Is it because these countries have different definitions of rape? Or something else? [more inside]
posted by vidur on Jan 13, 2013 - 32 answers

Ever search for evidence of absence instead of finding absence of evidence?

Is scientific research ever organized to search for evidence of absence by reversing the null hypothesis? If not, why not? [more inside]
posted by nathan v on Dec 23, 2012 - 5 answers

Human Random Generator

Can you think of a method that allows an individual to pseudo randomly create a sequence of numbers (at the very least the randomness is opaque to the minds of other people) assuming said individual may only use his mind and body (no physical tools are allowed)? [more inside]
posted by Foci for Analysis on Dec 21, 2012 - 7 answers

Biostatistics filter

What statistical test should I use to determine if there is a significant difference in the percent change in the presence of bacterial species observed among five groups before and after treatment. [more inside]
posted by waving on Dec 18, 2012 - 19 answers

Statistics...Not my strong suit

[StatisticsForTheFeebleMinded]My medical office sees patients who must have monthly blood draws for a condition they have. The samples have the same two tests performed on them at an outside laboratory and by our in-house laboratory. Within the last year, these values have begun to differ wildly. Need recommendations for software/programs/equations/thoughts for analyzing any trend within the numbers that might offer an explanation as to why this is now happening. [more inside]
posted by kuanes on Dec 11, 2012 - 25 answers

Stats-filter: Comparing individual means?

StatsFilter: How do I compare the means of an individual at three different points? [more inside]
posted by Scottie_Bob on Dec 6, 2012 - 13 answers

Statistics on apartment sizes

Is there any kind of listing online that gives average or median apartment sizes by country or, ideally, by city? [more inside]
posted by frimble on Dec 6, 2012 - 2 answers

What does a professional statistician do?

(Good) jobs involving probability and statistics other than math teacher or actuary? [more inside]
posted by CustooFintel on Dec 3, 2012 - 15 answers

I thought this new scoring system would take care of all the other issues...

I have a bunch of scores for sites that are the sum of the individual scores of the samples that they contain. The number of samples in each site varies from 1 to several hundred. I would like to adjust the overall site scores to adjust for the variance in samples, so that a site with 200 samples doesn't overwhelm a site that has 10 where the site may be just as significant. However, I'm at a complete loss as how to accomplish this. Any thoughts?
posted by buttercup on Dec 3, 2012 - 11 answers

Statistics help

Statistics question about a rare event, and the expected distribution of sightings among witnesses. [more inside]
posted by 517 on Dec 1, 2012 - 9 answers

How to solve a complex statistics problem with a script?

In this game, you roll a number of six-sided dice to get a total. The total is either the highest single die result, or the sum of any multiples rolled, whichever is higher. For example: If I roll three dice and get a 3, 4, and 6, my total is 6. But if I roll a 4, 4, and 6, my total is 8, the sum of the two 4s. What I want to find out is the mean, median, mode, and standard deviation of the possible totals given N dice. How might I create a simple script to compute this? [more inside]
posted by j0hnpaul on Nov 30, 2012 - 24 answers

How do I negotiate with my publisher?

My stats notes are getting too long to distribute using the university printers. A publisher wants to turn them into a printed book, but I want to keep control of the electronic distribution of my work. How should I approach this situation? [more inside]
posted by mixing on Nov 26, 2012 - 17 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

Statistical analysis for a prospective cohort study with quantifiable outcomes?

What kind of statistical analysis would I use to compare the outcomes of a prospective cohort study, one with an intervention and one as the control? [more inside]
posted by legospaceman on Nov 15, 2012 - 9 answers

What should my sample size be?

Say that I have a bag which contains 100 balls and every ball in the bag should be red, but it's possible that one or more of these balls is the wrong colour. How many balls should I look at to be 90% sure that all the balls are red? Or 95%? Or 99.9%? Talk me through how to work this out, please?
posted by xchmp on Nov 12, 2012 - 14 answers

Practice Probability Word Problems

What great books or resources are there for practicing probability word problems such as for standardized tests like the GRE? [more inside]
posted by Mr. Papagiorgio on Nov 8, 2012 - 3 answers

What are the odds that two randomly selected people share the same bank PIN?

Statisticsfilter: Given available information about the distribution of self-selected 4-digit passwords (specifically banking PINs), is it possible to calculate the probability of two randomly selected individuals having the same PIN? If so, what're the odds? [more inside]
posted by myrrh on Oct 27, 2012 - 15 answers

% of out-of-wedlock births ca. 1880?

I'm looking for the percentage of out-of-wedlock births per capita in the United States in 1880 (or, failing that, 1890). So far I'm coming up empty-handed. Specific stats for the District of Columbia will be even better, but I'm fairly certain that they're not available online.
posted by ryanshepard on Oct 16, 2012 - 2 answers

How to categorize curve patterns?

Statistics filter: How can I categorize time series curves into pattern categories? [more inside]
posted by lord_yo on Oct 11, 2012 - 2 answers

Help me turn my interests into a career!

Please help me figure out potential careers based on my interests and the best paths to obtain them. Psychology, economics, statistics? Market research? Psychometrics? [more inside]
posted by Malleable on Oct 2, 2012 - 14 answers

How do I calculate the probability of a specific sum of repeated die rolls?

I'm looking to learn how to calculate probabilities for a multi-round dice game. I've researched this question some, and it looks like I might need to know how to use the multinomial distribution, but I can't find any good introductions. Please point me to the most layman-accessible educational material on this subject, and help me to help myself. [more inside]
posted by Richard Daly on Sep 28, 2012 - 6 answers

Conditional Admissions to grad programs--how common are they in the wild?

Grad programs--I've just heard (for the first time) that conditional admissions are A Thing. Would I have a snowball's chance with a good GRE score alone or will I have to take pre-req undergrad classes first? [more inside]
posted by wires on Sep 23, 2012 - 16 answers

Biostatistics training outside of school

What after bio-statistics software experience is most attractive to future employers? [more inside]
posted by waving on Sep 6, 2012 - 5 answers

Too much noise in my data

Putting on the math signal: calling the statistics-literate. Trying to change my weight/body composition and track progress in a useful way, but I'm having trouble separating normal daily variation from actual real change. [more inside]
posted by ctmf on Sep 1, 2012 - 15 answers

How do I elegantly present tabular, statistical data online?

How do I elegantly present tabular, statistical data online and automatically? I'd love some examples of beautifully presented tabular data online - something that works natively in a browser, ideally also on a tablet and mobile as well. Some interactivity (sorting, filtering) also OK but priority is usability and elegance like you'd find in printed statistical abstracts. Bonus points for open source web tools / frameworks that could help automate this from a database! [more inside]
posted by tkbarbarian on Aug 30, 2012 - 9 answers

What is this type of chart called and/or how do you create one in Excel?

What is this type of chart called and/or how do you create one in Excel? [more inside]
posted by tippiedog on Aug 17, 2012 - 8 answers

Recommendations for great books about probability and risk.

Recommendations for great books about probability and risk. [more inside]
posted by inbetweener on Aug 17, 2012 - 18 answers

Help me keep my SmartyPants image shiny.

Considering the huge amount of oil/energy expended driving trucks full of food all over the country, would it make more sense to increase our train infrastructure (is that even possible?) to move more food? That's the question, but not why I've come to Metafilter. [more inside]
posted by kestralwing on Aug 14, 2012 - 10 answers

Non-parametric models for a non-normal outcome with multiple explanatory variables?

StatisticsFilter, non-parametric edition: I'd like to test if my non-normally distributed outcome is significantly different between two groups adjusting for a third variable. [more inside]
posted by docgonzo on Aug 8, 2012 - 5 answers

Does Facebook publish photo upload statistics?

Does Facebook publish statistics? I'm specifically interested in statistics about photo uploads and camera metadata / popularity. [more inside]
posted by ztdavis on Aug 2, 2012 - 1 answer

Lies. Damned lies. And statistics.

Are there any reliable statistics for the number of American high school seniors who apply to colleges each year? [more inside]
posted by dfriedman on Jul 22, 2012 - 3 answers

What are the *approximate* download numbers for a Top 20 podcast episode?

What are the *approximate* download numbers for a Top 20 podcast episode? [more inside]
posted by LordSludge on Jul 11, 2012 - 3 answers

So, um, how big is your....kneecap?

Say I'm an industrial designer (I'm not), and I have to design a car seat, desk chair, climbing harness, body armor, or some other piece of equipment that has to be able to interact with a whole bunch of differently-shaped humans on a regular basis. What resource do I use to find out things like average foot width, or average knee circumference, average jaw length, or any other specific anatomical measurements? [more inside]
posted by cirgue on Jul 11, 2012 - 6 answers

What is the best way to learn R?

What is the best way for me to learn R? In particular, what is the best website or online tutorials for learning to deal with large datasets. [more inside]
posted by aleatorictelevision on Jun 20, 2012 - 13 answers

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