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129 posts tagged with statistics *and* resolved.

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## Help me turn student grades into informative statistics with charts.

TA/Instructor looking for an easy way to plug in a list of grades and get statistical information back, preferably in chart form. I would like to see things like the mean, median, and standard deviation, and a visual representation of the the distribution. [more inside]

## What is the funniest statistics-related joke that you know?

Please tell me the funniest statistics-related joke or jokes that you know.
I give talks and run workshops about statistical concepts - broadly defined - to mixed audiences. Jokes will be used as ice-breakers. The ideal joke will be funny to everybody, and doubly funny to statisticians. [more inside]

## RRPQBBQ

How exactly do you score this Reactions to Research Participation Questionnaire Revised (RRPQ-R) form? I see some hints on the last page, but what steps would a researcher take to turn a stack of completed forms into data the proper way? I could take a guess but I'm curious to know the actual method. Google is seemingly empty of the answer. I do not think I have access to the sources on the last page.

## Can you help me explain diabetes to a cranky old guy?

Family member (FM), mid-seventies, healthy (some mild arthritis), stubborn. Talked into getting blood work and doctor exam because of family history of kidney problems. Kidneys are great, everything is great, except his blood sugar levels. Doctor says "diabetic," FM very resistant to diagnosis, doctor unable to explain in a way he can understand. I'm the one he talks to most freely, so ... how do I explain this when I don't understand it very well myself? Seeking explanations, and sources if possible. [more inside]

## Quick Data Collection Problem

I have a CSV with one column that contains User IDs. I need to make another CSV that counts how many times each User ID appears in the document, and output it to another CSV That has something like UID1 >> 3; UID4 >> 1; UID20 >> 0. There are thousands of User IDs, so I need to be able to set up a range for it to scan for. Is this possible with free software and not much programming expertise? [more inside]

## What Do I Do With All This Data?

I have a research project involving about ~90 subjects in two (self-selected) groups. I have collected a number of variables about these subjects (from public sources), and now I would like to do some statistical tests to say whether these variables are significantly correlated with membership in one group or the other. How do I do this? I have a basic knowledge of R and access to Stata 14. [more inside]

## Can an exact measurement ever be statistically insignificant?

I am dubious of a colleagueâ€™s assertions about statistics. [more inside]

## Lies, Damn Lies, and Pregnancy Statistics

There is a statistic that gets thrown at all women trying to get pregnant stating that each month that you only have a 20% chance of getting pregnant assuming each partner is fertile and otherwise healthy. This seems super low (and depressing and discouraging) to me. What gives? [more inside]

## And then the kangaroo said, "did you bring the vitamins?"

Years ago my college roommate took a statistics course. In the textbook was a small, confounding cartoon that appeared to make no sense but was hilarious in its absurdity. I would like to know about that cartoon. [more inside]

## The amount of autistic people in the United States

If autism is diagnosed in 1 of 68 children, and there are 381 million people in the country, can I use these two facts to find out how many people in the US are autistic?

## Fruit salad for statisticians

What formula do I need to determine the probability that a set of size N contains two elements, each appearing with a specific frequency? [more inside]

## Math Problem

Please help with this probability related math problem. [more inside]

## Help me understand the concept of "85th Percentile."

I am part of a group working on a policy document for the mitigation of traffic issues (e.g. speeding). Stakeholders are having a hard time with a particular criteria which reads as follows: "85th percentile speed is in excess of the signed speed limit by 5 mph or more." [more inside]

## Math, sweet sweet math

I have a set of data: D(t). 5000 samples. Scatter-graphing makes some patterns clear (D-mean increases with t, for instance). D and t are always positive. I want to characterize these, statistically. [more inside]

## is this a good use case for a gamma distribution?

I want to generate synthetic user-session data to predict how big a peak in application usage might be shortly before a weekly deadline (for timesheet submission - it's a time and labour tracking application). I've come up with a method that looks like it works - it involves a gamma distribution for the login time. But I don't have enough (in fact, any) statistical training to know whether I'm using that distribution meaningfully. Statisticians, please reassure me. Thanks! Excel functions inside... [more inside]

## Gun Violence Statistics - Workplace Edition

I need help finding some statistics regarding workplace violence and - particularly separating out violence perpetrated by internal employees vs external 3rd parties. [more inside]

## What are inter-disciplinary and atypical uses for math MSc?

I have just completed my MSc in mathematics in Europe. I do enjoy math, but I spent my uni years feeling like a autodidact hippie marooned on an island full of Mr and Mrs I-Want-A-Good-Job. My main interests revolve around humanities (literature/history/anthropology) and economics (but not finance), and instead of starting a "stable" well-paying career I dream about something inter-disciplinary. I am very open to earning little money and relocating just to do kind of work that engages those skills. What are some random uses of my degree? [more inside]

## The Mid-PhD Crisis

Hi Hivemind,
I'm currently enrolled in a PhD program for statistics and operations research, and in two more years I can grab that PhD. Alternatively, I can jump ship now with a MS, headed for the (inviting/inevitable) waters of industry.
Knowing that I have no interest in staying in academia, give me some motivation to finish. Or, tell me to quit because actual work experience is more valuable! What roles should I be looking at other than Data Scientist? Would it be feasible to get a position doing private research, and would that be awesome? Bonus points if you can tell me what skills I should be cultivating to be hire-able (software engineering)?
P.S. I will also do some more chatting with profs and former students to figure out how I should be directing myself, but I hope the HiveMind can provide some complementary ideas.

## Economics 101: How to read national accounts

I'm trying to reconcile two numbers from the same national statistical agency. I'm looking for a dummy's guide for what defines the difference between the two numbers and how to use one to estimate the other. [more inside]

## Where can I find a word-count tool to track my writing goals?

I'm looking for a word-count tool that will allow me to: set a goal for words written by a specific date, enter in the words I have written each day, see how many words I remaining toward my goal, and how many words I will need to average each day to reach my goal. [more inside]

## 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]

## Statistical analysis of votes for a certain outcome

We have a group of six people with 55 different options. Each member of the party has to vote for each option under 8 different analyses i.e. appearance, distinctness, etc. The options are quality weighted. [more inside]

## 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.)

## Statistics question when value of test statistic t...

I'm working on a problem for "Inferences about the difference between two population means for independent samples: sigma 1 & 2 unknown and unequal."
The final value of "test statistic t" falls in the rejection region for 95% confidence interval, but falls in the nonrejection region for 99% confidence interval.
Should I perform additional calculations before rejecting my null hypothesis?

## The limits to bedbugs

What are the limits to bedbugs? Why isn't every hotel room infested given how tough they are claimed to be? Is there any evidence on the chances of taking bed bugs home from a hotel with you? Will the bedbug infestation rates go ever upwards? Why or why not? Interested in aggregated, rather than anecdotal evidence here. [more inside]

## 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.

## 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]

## 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]

## What does a professional statistician do?

(Good) jobs involving probability and statistics other than math teacher or actuary? [more inside]

## 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]

## Biostatistics training outside of school

What after bio-statistics software experience is most attractive to future employers? [more inside]

## 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]

## 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]

## 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]

## Important or interesting research done in your field?

What is some recent important or interesting research done in your field? [more inside]

## How to model the accident rate on a certain stretch of road

How could I approach modeling the number of accidents on a certain stretch of road? I've got some semi-ecological approaches in mind but no idea if they're workable. Are there standard approaches to this sort of problem? [more inside]

## Looking for cancer survival statistics by individual hospitals in England.

Looking for cancer survival statistics by individual hospitals in England. [more inside]

## Help the stats-challenged understand an odds ratio

Statistics make my head go wobbly. But I need to understand something about odds ratios. Actually, I don't need to understand -- I just need to make sure I'm not screwing up this particular figure. Please help! [more inside]

## Bathrooms and Statistics

My workplace has 3 small bathrooms. It seems to me that if I go to use one of them, and it's occupied, there is a statically higher chance the 2nd and even 3rd bathroom will be occupied (vs the chance that they would be occupied if the 1st one was not). Is it true? [more inside]

## Lies, damned lies and statistics?

I'm trying to find the primary source of a much-repeated, but somewhat dubious, statistic. [more inside]

## How to determine relationship between two dimensions of a 3 x 3 frequency matrix?

Could someone help me to analyze statistical relationship between two dimensions of a frequency matrix - preferably in Excel? [more inside]

## Skip patterns and user-missing values in SPSS

SPSS-filter: changing systems-missing values to user-missing values to match survey skip pattern. [more inside]

## Who are the 1% in India?

Where can I find the income distribution for India? My google-fu is weak on this one. [more inside]

## Counting the Elderly

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

## That's not a blue moon; pull over...

Can anyone point me to actual data on how often motorists receive traffic tickets? I'm looking for where the top of the bell curve is, so to speak - obviously, individuals vary widely, which is kind of the point of my question - how often does the "median" driver receive traffic tickets? [more inside]

## Recommendations for free or cheap graphing software

Can you recommend free (or cheap) graphing software for Windows? [more inside]

## 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]

## How can I integrate a time sequence of correlations?

Statistics filter: If I asses the same paired variables for the same population at multiple points in time, can I integrate the relation into an overall correlation? [more inside]

## Ref.Cat? s.e.? Stats help needed!

Would you be kind to someone who is culturally proficient, but statistically deficient? Specifically, what is going on in the tables at the end of this paper? [more inside]

## A little help on a statistics paper on inflation, in German.

I am looking for a little translation help on an inflation statistics paper in German language (look in more inside for the link). This official paper is quite interesting for students of statistics and social students interested in perceived cost of living vs actual cost of living, in Europe as well as in any other country, as it allegedly shows that indeed there were some excessive rouding of prices during the conversion to euro in Germany. [more inside]