cshalizi + blogged   37

Quantum Chaotic Thoughts: Unconditional Justice
No, no, no. I like harshing on lawyers as much as the next scientist, but actually reading the news story suggests something much more reasonable. The judge on the appeals court was not, it seems, throwing out Bayes's theorem, but rather refusing to be cowed by Bayes's theorem when the base rates and the likelihoods appearing in it are wild-ass guesses. To quote the news story Mason links to: "And so he decided that Bayes' theorem shouldn't again be used unless the underlying statistics are "firm"." This is, of course, the completely correct attitude; otherwise, the Bayesian posterior is simply without any evidential value whatsoever, and the difference between an expert stating "I'm, like, really sure" and "My posterior probability is 0.99" lies entirely in the latter's spurious precision.
law  evidence  statistics  base_rates  bayes_rule  bayesianism  accuracy_vs_precision  blogged  porter.mason 
october 2011 by cshalizi
[1108.0833] Temporal statistical analysis on human article creation patterns
Sadly, in this case fitting crappy power laws to the works of Gene Stanley and Laszlo Barabasi is not an_intentional_ joke.
bad_data_analysis  heavy_tails  barabasi.albert-laszlo  stanley.h._eugene  newman.mark  su.shi  have_read  blogged 
august 2011 by cshalizi
Confirmation in the Cognitive Sciences: The Problematic Case of Bayesian Models
"Bayesian models of human learning are becoming increasingly popular in cognitive science. We argue that their purported confirmation largely relies on a methodology that depends on premises that are inconsistent with the claim that people are Bayesian about learning and inference. Bayesian models in cognitive science derive their appeal from their normative claim that the modeled inference is in some sense rational. Standard accounts of the rationality of Bayesian inference imply predictions that an agent selects the option that maximizes the posterior expected utility. Experimental confirmation of the models, however, has been claimed because of groups of agents that “probability match” the posterior. Probability matching only constitutes support for the Bayesian claim if additional unobvious and untested (but testable) assumptions are invoked. The alternative strategy of weakening the underlying notion of rationality no longer distinguishes the Bayesian model uniquely."
philosophy_of_science  cognitive_science  bayesianism  kith_and_kin  have_read  re:phil-of-bayes_paper  blogged  eberhardt.frederick  danks.david 
july 2011 by cshalizi
TopatoCo: "Keep Calm and Shoot Them in the Head" Print
Would it be wrong to put this up in the office, across from the student chair?  (Yes, probably, but oh so tempting.)
zombies  funny:geeky  affectionate_parody  coveted  blogged 
march 2011 by cshalizi
Ghosts in the Hollow on Vimeo
"Let the flowers be forgotten/ Sprinkle coal dust on my grave/ In remembrance of the UMWA"
via:?  labor  appalachia  modern_ruins  blogged 
september 2010 by cshalizi
Once Upon a Time in Afghanistan... | Foreign Policy
Someone's digitizing the photos from my grandfather's book!
kith_and_kin  afghanistan  photos  via:aks  blogged 
june 2010 by cshalizi
Matthew Yglesias » Sexy Teen Trend Data
"Obviously, this data I’ve cited is perhaps open to some criticisms or alternate interpretations. But Flanagan doesn’t dispute it, doesn’t cite alternate data, and doesn’t even seem to be aware of the possibility of discussing social trends in terms of evidence rather than assertion."
utter_stupidity  why_oh_why_cant_we_have_a_better_press_corps  running_dogs_of_reaction  natural_history_of_truthiness  flanagan.caitlin  yglesias.matthew  practices_relating_to_the_transmission_of_genetic_information  blogged 
june 2010 by cshalizi
Phantom of Heilbronn - Wikipedia, the free encyclopedia
In which the combined police forces of Europe spend years chasing a female serial killer known only from DNA evidence, only to find that it's all down to contaminated cotton swabs from a single supplier!

Teaching note for data mining: This should make a great example of the importance of getting the data right, before worrying about the statistical processing...
via:arsyed  serial_killers  to_teach:data-mining  bad_data  DNA_testing  forensics  wtf  inference_to_latent_objects  blogged 
may 2010 by cshalizi
[1004.3138] Statistical Analysis of Global Connectivity and Activity Distributions in Cellular Networks
"we analyze a comprehensive data set of protein-protein and transcriptional regulatory interaction networks in yeast, an E. coli metabolic network, and gene activity profiles for different metabolic states in both organisms. We show that in all cases the networks have a heavy-tailed distribution, but most of them present significant differences from a power-law model according to a stringent statistical test. Those few data sets that have a statistically significant fit with a power-law model follow other distributions equally well. Thus, while our analysis supports that both global connectivity interaction networks and activity distributions are heavy-tailed, they are not generally described by any specific distribution model, leaving space for further inferences on generative models."
have_read  biochemical_networks  heavy_tails  blogged 
april 2010 by cshalizi
Language Log » The defend-your-turf area?
Watching MYL debunking tendentious appropriations of neuroscience _again_, the phrase "One must imagine Liberman happy" comes to mind...
debunking  utter_stupidity  sexist_idiocy  neuroscience  sex_differences  rats  liberman.mark  brizendine.louann  blogged 
march 2010 by cshalizi
Developmental Decomposition and the Future of Human Behavioral Ecology (Kitcher, 1990)
Warning: it turns out that his case study for his approach is the development of the incest taboo, and he's pretty free in quoting the clinical literature about how exactly the taboo gets broken. This actually has considerable redeeming intellectual value, but is still not for the squeamish and/or victimized.
evolutionary_psychology  behavioral_ecology  human_evolution  kitcher.philip  philosophy_of_science  explanation  psychology  incest  have_read  blogged 
december 2009 by cshalizi
Power-Law Distributions in Empirical Data
Begun fall 2004, submitted to this journal at the end of 2007, finally appearing 2009.
self-centered  blogged 
november 2009 by cshalizi
Causal Inference in Statistics: An Overview (Pearl, 2009)
Described by Uncle Judea as "A new survey paper, gently summarizing everything I know about causation (in only 43 pages)".
causality  causal_inference  statistics  pearl.judea  blogged  have_read 
september 2009 by cshalizi
YouTube - Ah Pook The Destroyer
"One of those gobs of grease is our universe on its way to the floor - splat!"
burroughs.william_s.  nukes  you_stupid_greedy_vulgar_ugly_american_deathsucker  blogged 
july 2009 by cshalizi
Op-Ed Contributor - The Test Passes, Colleges Fail - NYTimes.com
File under: people who do not grasp the meaning of the term "controlled experiment". See also: "ecological fallacy", "massive confounding".

Update: I gave in: http://bactra.org/weblog/592.html
bad_data_analysis  academia  standardized_testing  salins.peter  via:klk  blogged 
november 2008 by cshalizi
The End of Theory: The Data Deluge Makes the Scientific Method Obsolete
A profoundly - and characteristically - stupid cover story from Wired. (And I say this as someone who _works_ on nonparametric model discovery.)
anderson.chris  utter_stupidity  methodological_advice  data_mining  bad_science_journalism  the_wired_ideology  to_teach:data-mining  blogged 
june 2008 by cshalizi
Shortpacked!
Frank Miller fails a test. (I liked _Ronin_, when I read it as a teenager, but otherwise, eh.)
comics  funny:malicious  miller.frank  misogyny  via:walter_jon_williams  blogged 
april 2008 by cshalizi
Daily Llama: telephones
Cell phones; "One needs to have a valid description of the system under consideration before any reasonable statistics can be calculated."
statistics  bad_data_analysis  blogged 
february 2008 by cshalizi
Halfway down the Danube: Day 20: Mattavilasa blogging
"So the stereotype was of creepy horny drunk carnivorous beggars covered in human ash, accompanied by hott chick acolytes, carrying around someone's skull, asking you for money. I think they used to squat in Tompkins Square Park."
funny  india  religion  drama  sanskrit  yu.carlos  blogged 
november 2007 by cshalizi
Low Road to Splitsville
On Richard Mellon Scaife's divorce. (I live in Shadyside and go by those houses every day. I guessed the "welcome home" sign was for coming back from the vet's!)
running_dogs_of_reaction  vast_right-wing_conspiracy  pittsburgh  shadyside  scaife.richard_mellon  taste:bad  funny:malicious  via:krugman  blogged 
october 2007 by cshalizi

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