Mar 30th, 2008| 11:16 pm | Posted by hlee

I began to study statistics with the notion that statistics is the study of information (retrieval) and a part of information is uncertainty which is taken for granted in our random world. Probably, it is the other way around; information is a part of uncertainty. Could this be the difference between Bayesian and frequentist?

__The statistician’s task is to articulate the scientist’s uncertainties in the language of probability, and then to compute with the numbers found__: cited from Continue reading ‘Statistics is the study of uncertainty’ »

Mar 30th, 2008| 07:51 pm | Posted by hlee

The numbers of astro-ph preprints on average have been decreased so as my hours of reading abstracts…. cool!!! By the way, there is a paper about solar cycle, PCA, ICA, and Lomb-Scargle periodogram. Continue reading ‘[ArXiv]4th week, Mar. 2008’ »

Mar 27th, 2008| 09:48 pm | Posted by vlk

From Prajval Shastri of IIAp comes news of the sequel to last year’s Astrostatistics school at Kavalur, India:

The Indian Institute of Astrophysics and the Center for Astrostatistics, Pennsylvania State University (USA) are jointly organising an 8-day school in fundamental statistical inference as applicable to astrophysical problems during 9-16 July, 2008 (www.iiap.res.in/astrostat). The school is intended for practising astrophysics researchers at all levels. Details may be found on the website of the school.

Continue reading ‘AstroStatistics School in India’ »

Tags:

2008,

IIAp,

India,

Jogesh Babu,

July,

Kavalur,

Penn State,

Prajval,

School,

Vainu Bappu Category:

Astro,

News |

1 Comment
Mar 24th, 2008| 08:03 pm | Posted by hlee

Bradley Efron, Stanford University

11:00 AM, Friday, April 4, 2008

Sever Hall Rm. 103

Title: SIMULTANEOUS INFERENCE: WHEN SHOULD HYPOTHESIS TESTING PROBLEMS BE COMBINED

Its abstract and other informations at http://www.stat.harvard.edu/Colloquia_Content/Efron08.pdf

Continue reading ‘Prof. Brad Efron visits Harvard’ »

Mar 21st, 2008| 06:20 pm | Posted by hlee

Markov chain Monte Carlo (MCMC) never misses a week from recently astro-ph. A book titled *MCMC in astronomy* will be a best seller. There are, in addition, very interesting non MCMC preprints. Continue reading ‘[ArXiv] 3rd week, Mar. 2007’ »

Tags:

chi-sq,

Fourier Analysis,

GREAT08,

lensing,

likelihood,

misnomer,

Poisson noisy image,

sparse Category:

arXiv,

Cross-Cultural,

Jargon,

MCMC |

Comment
Mar 14th, 2008| 03:44 pm | Posted by hlee

Warning! The list is long this week but diverse. Some are of CHASC’s obvious interest. Continue reading ‘[ArXiv] 2nd week, Mar. 2008’ »

Tags:

ANN,

autocorrelation,

Classification,

cross-correlation,

Estimation,

Fisher information,

lensing,

LF,

Model Selection,

Pareto,

signal processing,

tessellation Category:

arXiv,

MCMC |

Comment
Mar 13th, 2008| 01:53 pm | Posted by vlk

During the runup to his recent talk on logN-logS, Andreas mentioned how sometimes people are confused about the variety of statistical biases that afflict surveys. They usually know what the biases are, but often tend to mislabel them, especially the Eddington and Malmquist types. Sort of like using “your” and “you’re” interchangeably, which to me is like nails on a blackboard. So here’s a brief summary: Continue reading ‘Eddington versus Malmquist’ »

Mar 12th, 2008| 03:32 pm | Posted by hlee

Astrometry.net, a cool website I heard from Harvard Astronomy Professor Doug Finkbeiner’s class (Principles of Astronomical Measurements), does a complex job of matching your images of unknown locations or coordinates to sources in catalogs. By providing your images in various formats, they provide astrometric calibration meta-data and lists of known objects falling inside the field of view. Continue reading ‘Astrometry.net’ »

Mar 11th, 2008| 07:26 pm | Posted by chasc

“*Same data, different authors, different results.*”

(Marco Sirianni, from a conference on starbursts).

Mar 7th, 2008| 06:01 pm | Posted by hlee

Irrelevant to astrostatistics but interesting for baseball lovers.

[stat.AP:0802.4317] Jensen, Shirley, & Wyner

**Bayesball: A Bayesian Hierarchical Model for Evaluating Fielding in Major League Baseball**

With the 5th year WMAP data release, there were many WMAP related papers and among them, most statistical papers are listed. Continue reading ‘[ArXiv] 1st week, Mar. 2008’ »

Tags:

baseball,

cosmology,

MLE,

tessellation,

void,

WMAP,

XMM Category:

arXiv,

Bayesian,

Cross-Cultural,

Fitting,

Jargon,

MCMC |

Comment
Mar 5th, 2008| 04:46 pm | Posted by hlee

This is a quite long paper that I separated from [Arvix] 4th week, Feb. 2008:

[astro-ph:0802.3916] P. Carvalho, G. Rocha, & M.P.Hobso

**A fast Bayesian approach to discrete object detection in astronomical datasets – PowellSnakes I **

As the title suggests, it describes Bayesian source detection and provides me a chance to learn the foundation of source detection in astronomy. Continue reading ‘[ArXiv] A fast Bayesian object detection’ »

Tags:

Bayesian evidence,

coloured background,

CRLB,

decision theory,

filter,

Fisher informatoin,

likelihood,

PowellSnake,

prior,

simulated annealing,

SNR,

source detection,

state space,

Sunyaev-Zel'dovich effect,

symmetric loss,

templates Category:

Algorithms,

arXiv,

Bayesian,

Cross-Cultural,

Data Processing,

Fitting,

Frequentist,

MCMC,

Methods,

Objects |

Comment
Mar 5th, 2008| 02:13 pm | Posted by hlee

There have been strong collaborations among statisticians, mathematicians, computer scientists, and astronomers (cosmologists) under WMAP (Wilkinson Microwave Anisotropy Probe) mission. Today, the 5th year data was released (The news is found here). For more, click Continue reading ‘The WMAP Five-Year Data Release’ »

Mar 3rd, 2008| 12:39 pm | Posted by hlee

In this posting, I added lecture notes on cosmic microwave background (CMB) and Gravitas DVD (animation, I believe). There is another paper I must include but I decide to write a short review separately. Continue reading ‘[ArXiv] 4th week, Feb. 2008’ »

Tags:

animation,

bimodality,

CMB,

exoplanet,

Fisher matrix,

flare,

GRAVITAS,

lecture notes,

light curve,

Nikos Voglis,

state space,

stochastic Category:

arXiv |

Comment