Resampling Hierarchically Structured Data Recursively
That's a mouthful! I presented this topic to a group of Vandy statisticians a few days ago. My notes (essentially reproduced in this post) are recorded at the Dept. of Biostatistics wiki:...
View ArticleuseR! 2012 Deadlines Approaching: Registration, Hotels, Student Scholarships
Forwarded from Frank Harrell: DEADLINES FAST APPROACHING – 8th Annual International R User Conference useR! 2012, Nashville, Tennessee USA Registration Deadlines: Early Registration: Passed Regular...
View ArticleUpdate: Parameters as Population Quantities
Some time ago, I had an ineloquent and less-than-cordial online discussion with a commenter on this site, partially about how statisticians define the term "parameter". This post is just to quote a...
View ArticleBayesian credible intervals in the mainstream medical literature
I have sometimes heard complaints from collaborators that it will be impossible to have their work published in the mainstream literature unless a p-value is reported. This post is to report yet...
View ArticleBank of America 1% Cash Rewards Aren't Really 1%
Bank of America (BoA) has a "Cash Rewards" credit card that pays "1% cash back everywhere, every time"1. But if you read the fine print, it's clear that the reward is almost always less than 1%. Here's...
View ArticleRevised graph for BAC 1% cash rewards
Thanks to Anthony Damico who alerted me to an error in the Bank of America's 1% cash rewards figure in my last post. The plot shows the true reward percentage as a function of purchase amount. A key...
View ArticleBreakthroughs in the sas7bdat Reverse Engineering Effort
Due largely to the work of Clint Cummins, the sas7bdat file format has become a bit less shrouded. In particular, we now know the following: how to detect files with compressed data (and fail...
View ArticleSimulated Power/Precision Analysis
I cringe when I see research proposals that describe a sophisticated statistical approach, yet do not evaluate this approach in their power/precision/sample size planning. It's often the case that a...
View ArticleGeneralized Pairs Plot: It's about time!
JW Emerson, WA Green, B Schloerke, J Crowley, D Cook, H Hofmann, H Wickham (2013) The Generalized Pairs Plot. Journal of Computational and Graphical Statistics 22(1). Here's a free preprint version....
View ArticleIdentify 2/3 vacation photos, win $5 Starbucks gift card
I have a $5 Starbucks gift card that I simply can't remember to use; I've had it since Christmas. So, I will mail it (within the U.S.A.) to the first commenter who can identify the longitude/latitude...
View ArticleHurray! An R Connections API!
I waited until April 3 to post this, so it wouldn't be taken as an April Fool's joke! A recent R News item announces that we now have a bona fide mechanism to create custom connections in R! This makes...
View ArticleDescending Text in Righthand Margin of R Graphics à la mtext
There was an R-help thread in January regarding text in the righthand margin of an R graphic, where the text should be rendered in reading order from top to bottom. The base R function mtext is used to...
View ArticleA Recipe for Trellis/Faceted Plots Using Base R Graphics
I frequently use lattice and ggplot2 to create trellis/faceted graphics. But, I gave up using these packages in a recent application, where I had initially constructed a complex graphic using the base...
View ArticleImage CGI with R
I received an email recently with a question about using R in the common gateway interface (CGI) framework to create and pass image data to the web browser. I posted to stackoverflow about this some...
View ArticleAlternatives to model diagnostics for statistical inference?
Consider the problem of making statistical inferences, as opposed to predictions. The product of statistical inference is a probabilistic statement about a population quantity, for example a 100(1-)%...
View ArticleMaking inferences about unusual population quantities.
This post builds on my last: Alternatives to model diagnostics for statistical inference?, where I had claimed that we could make quality inferences about the best linear approximation to a quadratic...
View ArticleRead sas7bdat files in R with GGASoftware Parso library
... using the new R package sas7bdat.parso. The software company GGASoftware has extended the work of myself and others on the sas7bdat R package by developing a Java library called Parso, which also...
View ArticleSome 3D Graphics (rgl) for Classification with Splines and Logistic...
This semester I'm teaching from Hastie, Tibshirani, and Friedman's book, The Elements of Statistical Learning, 2nd Edition. The authors provide a Mixture Simulation data set that has two continuous...
View ArticleMore 3D Graphics (rgl) for Classification with Local Logistic Regression and...
This post builds on a previous post, but can be read and understood independently. As part of my course on statistical learning, we created 3D graphics to foster a more intuitive understanding of the...
View ArticleSimulation-based power analysis using proportional odds logistic regression
Consider planning a clinicial trial where patients are randomized in permuted blocks of size four to either a 'control' or 'treatment' group. The outcome is measured on an 11-point ordinal scale (e.g.,...
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