Sep 11th, 2009| 03:40 pm | Posted by hlee

A number of practical Bayesian data analysis books are available these days. Here, I’d like to introduce two that were relatively recently published. I like the fact that they are rather technical than theoretical. They have practical examples close to be related with astronomical data. They have R codes so that one can try algorithms on the fly instead of jamming probability theories. Continue reading ‘[Books] Bayesian Computations’ »

Tags:

book,

BUGS,

CMB,

examples,

HMM,

identifiability,

image processing,

LLN,

mixture,

MRF,

R Category:

Bayesian,

Fitting,

Languages,

MC,

MCMC,

Methods,

Stat |

1 Comment
Aug 25th, 2009| 09:19 pm | Posted by hlee

**Kriging** is the first thing that one learns from a spatial statistics course. If an astronomer sees its definition and application, almost every astronomer will say, “Oh, I know this! It is like the 2pt correlation function!!” At least this was my first impression when I first met **kriging.**

There are three distinctive subjects in spatial statistics: **geostatistics**, **lattice data analysis**, and **spatial point pattern analysis.** Because of the resemblance between the spatial distribution of observations in coordinates and the notion of spatially random points, spatial statistics in astronomy has leaned more toward the spatial point pattern analysis than the other subjects. In other fields from immunology to forestry to geology whose data are associated spatial coordinates of underlying geometric structures or whose data were sampled from lattices, observations depend on these spatial structures and scientists enjoy various applications from geostatistics and lattice data analysis. Particularly, **kriging** is the fundamental notion in **geostatistics** whose application is found many fields. Continue reading ‘[MADS] Kriging’ »

Tags:

BLUP,

book,

books,

CMB,

Cressie,

Diggle,

geostatistics,

hierarchical model,

kriging,

MADS,

point pattern analysis,

sparse,

spatial statistics,

Stein,

WMAP Category:

arXiv,

Astro,

Imaging,

Jargon,

Methods,

Stat |

Comment
Jun 21st, 2008| 11:10 pm | Posted by hlee

Jun 8th, 2008| 09:45 pm | Posted by hlee

Despite no statistic related discussion, a paper comparing XSPEC and ISIS, spectral analysis open source applications might bring high energy astrophysicists’ interests this week. Continue reading ‘[ArXiv] 1st week, June 2008’ »

Tags:

black box,

catalog,

CMB,

confidence interval,

EGRET,

ICA,

ISIS,

maximum likelihood,

radio,

sample size,

student t,

XSPEC Category:

arXiv,

Data Processing,

gamma-ray,

High-Energy,

Methods,

Stat |

Comment
May 19th, 2008| 10:42 am | Posted by hlee

There’s no particular opening remark this week. Only I have profound curiosity about jackknife tests in [astro-ph:0805.1994]. Including this paper, a few deserve separate discussions from a statistical point of view that shall be posted. Continue reading ‘[ArXiv] 2nd week, May 2008’ »

Tags:

bimodality,

bootstrap,

calibration uncertainty,

CF,

Classification,

CMB,

dip,

exoplanet,

Fisher matrix,

flare,

GL,

jackknife,

KS test,

marked point,

maximum likelihood,

MLE,

poisson point process,

spatial data,

XLF Category:

arXiv,

Frequentist,

Uncertainty,

X-ray |

Comment
Apr 27th, 2008| 11:29 am | Posted by hlee

The last paper in the list discusses MCMC for time series analysis, applied to sunspot data. There are six additional papers about statistics and data analysis from the week. Continue reading ‘[ArXiv] 4th week, Apr. 2008’ »

Tags:

clusters,

CMB,

GALEX,

gravitaional waves,

lensing,

LF,

LMC,

machine learning,

maximum likelihood,

priors,

probability,

SDSS,

stellar populations,

sunspot,

time series Category:

arXiv,

MCMC |

Comment
Apr 20th, 2008| 09:05 pm | Posted by hlee

The dichotomy of outliers; detecting outliers to be discarded or to be investigated; statistics that is robust enough not to be influenced by outliers or sensitive enough to alert the anomaly in the data distribution. Although not related, one paper about outliers made me to dwell on what outliers are. This week topics are diverse. Continue reading ‘[ArXiv] 3rd week, Apr. 2008’ »

Tags:

background,

bootstrap,

calibration errors,

Cash statistics,

clusters,

CMB,

corona,

edge detection,

FFT,

gravitational lens,

maximum likelihood,

multiscale,

neural network,

outlier,

SDSS,

sunspot,

systematic errors,

topology,

WMAP,

XMM-Newton Category:

arXiv,

High-Energy,

MCMC |

Comment
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
Feb 10th, 2008| 11:56 am | Posted by hlee

Review papers on Bayesian hierarchical modeling and LAR (least angle regression) appeared in this week’s stat arXiv and in addition to interesting astro-ph papers.

A review paper on LASSO and LAR: [stat.ME:0801.0964] T. Hesterberg et.al.

** Least Angle and L**_{1} Regression: A Review

Model checking for Bayesian hierarchical modeling: [stat.ME:0802.0743] M. J. Bayarri, M. E. Castellanos

** Bayesian Checking of the Second Levels of Hierarchical Models **

Continue reading ‘[ArXiv] 1st week, Feb. 2008’ »

Tags:

CMB,

compressed sensing,

cosmic void,

experimental design,

hierarchical model,

ICA,

Kd-tree,

LAR,

LASSO,

Model Selection,

solar flare,

SVM Category:

arXiv |

Comment
Jan 11th, 2008| 03:44 pm | Posted by hlee

It is notable that there’s an astronomy paper contains **AIC, BIC**, and **Bayesian evidence** in the title. The topic of the paper, unexceptionally, is cosmology like other astronomy papers discussed these (statistical) information criteria (I only found a couple of papers on model selection applied to astronomical data analysis without articulating CMB stuffs. Note that I exclude Bayes factor for the model selection purpose).

To find the paper or other interesting ones, click Continue reading ‘[ArXiv] 2nd week, Jan. 2007’ »

Tags:

AIC,

Bayesian evidence,

BIC,

catalog,

Classification,

CMB,

confidence interval,

consistency,

correlation,

GRB,

information criterion,

Model Selection,

SDSS,

test,

WMAP Category:

arXiv |

Comment
Dec 7th, 2007| 03:15 pm | Posted by hlee

There’s only one day in the first week of December with no preprint appearance. Dubbing the week of Dec. 2nd as the first week is hoped to be accepted. Continue reading ‘[ArXiv] 1st week, Dec. 2007’ »

Sep 11th, 2007| 01:36 am | Posted by hlee

From arxiv/astro-ph:0709.1144v1:

**Cosmic Microwave Background Statistics for a Direction-Dependent Primordial Power Spectrum** by A. R. Pullen and M. Kamionkowski

The authors developed cosmic microwave background statistics for a primordial power spectrum, motivated from the needs of testing the cosmological common assumption, i.e. the statistical isotropy of primordial perturbations. This statistics is for a primordial power spectrum, depending on the direction and the magnitude of the Fourier wavevector. Statistically speaking, the most interesting part is their construction of the ** minimum-variance estimators ** for the coefficients of a spherical-harmonic expansion of the direction-dependence of the primordial power spectrum.