What sort of survey are my colleagues planning? It would involve questionnaires dropped off at a variety of businesses (tour agencies and hotels, mostly), aimed at capturing details about their clients. This doesn't seem to fit the examples I see discussed in online resources on survey methods. To top it off, both the time frame and budget are limited. Where can I find best practices for this sort of survey--and how can I determine which best practices should be given highest priority? [more inside]
posted by col_pogo
on Oct 14, 2011 -
[StatsFilter] I have a data set which consists of 1000 groups. I'd like to perform the same commands on each group using the statistical software R. How can I write a loop function to perform this task? Or would any of the functions from the *apply family do a better job? [more inside]
posted by fix
on Oct 10, 2011 -
Please clear up the use of statistics by two people trying to compare crime rates in one huge city (NYC) to Charleston, SC. a much smaller city. [more inside]
posted by Elsie
on Sep 29, 2011 -
How do I interpret the crime statistics on a given neighborhood in my city? And is it then appropriate to make a judgment call on whether or not it's safe to put my child in a daycare there using that information? [more inside]
posted by kitcat
on Sep 21, 2011 -
I'm currently performing a mock research comparative analysis for a class. I'm researching the financials of 'our' metrics versus our highest competitors. One of the questions I'm attempting to answer asks if the variances (or standard deviations) of 'our' profit margins are statistically similar to the variances in profit margins of our competitors over a five year period. I have 11 companies representing the profit margins of our competitors, and of course the reports on our profit margins for these five years.
Now it's been a while since my last stats course... so I'm wondering, would I use an F or Levene's Test to answer this? Or am I completely off base... and should look to another form of analysis.
posted by Steve073190
on Sep 19, 2011 -
I'm trying to find the number of food products that are sold in the U.S. that contain high fructose corn syrup. I've done some preliminary searches and have found some lists, but I've come up dry when trying to find actual numbers. I'd like a reliable source that I can cite, but I'll take almost anything at this point. I am at a university and have access to a large number of subscription database resources, so I'll keep looking. But I thought metafilter might be able to help out here.
posted by pahool
on Sep 15, 2011 -
How can I test if one predictor variable in a regression is significantly better than another predictor variable?
i.e. If I regress X against A I get an r^2 of .99 and when I regress X against B I get .98. I need a test to see whether this difference is statistically significant. [more inside]
posted by vegetableagony
on Sep 13, 2011 -
Librarians: Do you know of any current
publications that rank borrowing performance - specifically ILL turnaround time - for academic libraries? [more inside]
posted by ryanshepard
on Sep 9, 2011 -
What's that quote? Something about each statistic in a news article reducing readership by x%. I can't for the life of me remember the exact words and who said it.
posted by tavegyl
on Sep 7, 2011 -
How can I find the average of multiple columns in excel without selecting each individual row that I want averaged? [more inside]
posted by gibbsjd77
on Sep 2, 2011 -
Where can I find statistical information on the effects of piracy on American shipping in the nineteenth century? [more inside]
posted by synecdoche
on Aug 31, 2011 -
How do TV channels figure out how many people watched a particular episode (e.g. XX million watched American Idol)?
I often hear things like XX million viewers watched American Idol or some other show.
How do the news guys / broadcasters come up with these numbers??
Surely they are not able to track what is being watched in peoples homes.
So I guess this is some kind of math or projection. Any idea how this is done?
posted by r2d2
on Aug 27, 2011 -
I think I need to learn about time series analysis. My statistics background is so mediocre that I'm not even sure this is the thing I actually need to learn. How far in over my head am I? [more inside]
posted by ootandaboot
on Aug 25, 2011 -
What are some basic math concepts I can use to understand and develop a ranking system? [more inside]
posted by rhizome
on Jul 26, 2011 -
If I have a dependent categorical variable with two values (say, basketball fans vs non-fans) and an independent numerical variable (say, height in millimeters) what statistical tests could I use to analyze my data, besides a t-test? [more inside]
posted by danceswithanonymity
on Jul 21, 2011 -
Statistics Filter: help me set up my coding data to calculate Cohen's Kappa as a measure of interrater reliability. Taking data from CAT
to SPSS. [more inside]
posted by activitystory
on Jul 14, 2011 -
Why is the divorce rate higher for those who have lived together before marriage than those who haven't? [more inside]
posted by coraline
on Jul 12, 2011 -
Rather than just Runs Batted In, I would like to be able to find out how successful a player is in a given RBI opportunity. Is there a way to discover (for example) what percentage of the time a player drives in the run when there is a runner on third and none out (or one out...or two out). I'm aware of the existence of B-ref, but I wasn't able to figure out how to find this type of data. [more inside]
posted by Carlo
on Jun 10, 2011 -
StatisticsFilter: Range restriction and the strength of linear and non-linear relationships. Help? [more inside]
posted by tybeet
on May 31, 2011 -
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?
posted by Blazecock Pileon
on May 16, 2011 -
How many people die while visiting a cemetery each year? In the US. Of any causes.
Are there any statistics for this kind of thing?
posted by GernBlandston
on May 9, 2011 -
On average, how many books are checked out of a US public library, per year? Has there been a decline or an incline books being checked out in the last couple of years? [more inside]
posted by carpyful
on Apr 21, 2011 -
I'm looking for historical employment, revenue and profit information for the top 500 businesses in the world, and I don't know where or how to look for it. [more inside]
posted by Freen
on Apr 4, 2011 -
How would I find a function that transforms random variables from an non-normal probability distribution to a normal distribution? [more inside]
posted by formless
on Mar 30, 2011 -
I just read Victor Niederhoffer's Practical Speculation
. Most of the book is devoted to analyzing trading opportunities using statistics. I am looking for other resources devoted to this topic. [more inside]
posted by prunes
on Mar 27, 2011 -
I'm taking a statistics class (for social sciences) and need help finding really dumbed-down
explanations of concepts, including how to use associated formulas. [more inside]
posted by oceanview
on Mar 22, 2011 -
Suppose that an event has a 1 in a million chance of happening in 1 year. The chance that it will happen once in a million years is %63. Explain. [more inside]
posted by antiquark
on Mar 15, 2011 -