Archive for the ‘News’ Category.

Did they, or didn’t they?

Earlier this year, Peter Edmonds showed me a press release that the Chandra folks were, at the time, considering putting out describing the possible identification of a Type Ia Supernova progenitor. What appeared to be an accreting white dwarf binary system could be discerned in 4-year old observations, coincident with the location of a supernova that went off in November 2007 (SN2007on). An amazing discovery, but there is a hitch.

And it is a statistical hitch, and involves two otherwise highly reliable and oft used methods giving contradictory answers at nearly the same significance level! Does this mean that the chances are actually 50-50? Really, we need a bona fide statistician to take a look and point out the errors of our ways.. Continue reading ‘Did they, or didn’t they?’ »

Is 8-sigma significant enough for you?

There is a new report from Bernabei et al. (arXiv:0804.2741) of the direct detection of the effects of Dark Matter that is causing a lot of buzz. (The Bad Astronomer has a good summary.) They find yearly modulation in their detected scintillation rate that matches what you would expect if the Earth were rushing through Galactic Dark Matter as it goes around the Sun. They have worked out the significance of the modulation to be 8.2 sigma. Significant! But significant of what? Continue reading ‘Is 8-sigma significant enough for you?’ »

AstroGrid Desktop Suite

AstroGrid Desktop Suite is available. Check the AstroGrid website http://www.astrogrid.org for more informations. Continue reading ‘AstroGrid Desktop Suite’ »

AstroStatistics School in India

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’ »

Prof. Brad Efron visits Harvard

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’ »

The WMAP Five-Year Data Release

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’ »

The GREAT08 Challenge

Grand statistical challenges seem to be all the rage nowadays. Following on the heels of the Banff Challenge (which dealt with figuring out how to set the bounds for the signal intensity that would result from the Higgs boson) comes the GREAT08 Challenge (arxiv/0802.1214) to deal with one of the major issues in observational Cosmology, the effect of dark matter. As Douglas Applegate puts it: Continue reading ‘The GREAT08 Challenge’ »

Scientific Programmer for the Kepler Mission

First posting regarding astrostatistics related job opportunities. Tom Loredo kindly informed us. Hopefully there are more to come.
Continue reading ‘Scientific Programmer for the Kepler Mission’ »

AstroStatistics Summer School at Penn State ‘08

When: June 9-14, 2008
Where: Penn State
Registration deadline: Apr. 18, 2008 [Previous years, it ended weeks before.]
The summer school website: http://astrostatistics.psu.edu/su08/. Continue reading ‘AstroStatistics Summer School at Penn State ‘08’ »

working together to tackle hard problems in astronomy

This is an edited email copy of Colloquium Announcement from Tufts University, MA. A must go for those live in Medford and Somerville, where Tufts Univ. is located and its vicinity.

Subject : Special Joint CS and Physics Colloquium
Title : How Astronomers, Computer Scientists and Statisticians are working together to tackle hard problems in astronomy
Speaker: Pavlos Protopapas
Date : Thursday February 7
Time : 3:15 pm
Place : Nelson Auditorium, Anderson Hall (Click for the map, 200 College Ave, Medford, MA, I think)
Abstract: Continue reading ‘working together to tackle hard problems in astronomy’ »

AstroStat special session at HEAD

The High Energy Astrophysics Division of the American Astronomical Society will meet at Los Angeles on March 31 - April 3, and we have been allocated a slot for an AstroStatistics session. It will be a 60-minute lunch-time session, so we anticipate that the session will be dominated by poster haikus and panel discussions similar to the workshop we held during the New Orleans meeting in 2004.

The meeting website is at: http://www.confcon.com/head2008/.The abstract submission deadline is January 25, 2008 (now past, but late abstracts are not unheard of among astronomers).

If you are attending the meeting, and plan to present posters or talks that deal with astrostatistical methods or techniques, we welcome you to participate in this session. When you submit an abstract, be sure to indicate a category of “Other” and in the comments field state that it belongs with the AstroStatistics special session.If you have questions, please contact Aneta or me. There is also a page for this session on the astrostat google groups site.

Update (1/22): The abstract submission page currently says that only one abstract is allowed per person. We have been informed that this is incorrect, and that people can submit two abstracts, one for the special session and one as a regular contribution. Note that posters will be up only one day, and those associated with a special session will be put up the day of the session.

Update (1/26): A detailed program is not yet available, but here is a description of the session:

Astrostatistics: Methods and Techniques

This session will provide a forum for the discussion and presentation of statistical challenges in high energy astrophysics, highlighting the great deal of progress that has been made in methods and techniques over the past decade. The one hour session will cover the current and future directions in Astrostatistics, and will include a discussion of MCMC methods in the context of specific applications (such as propagating calibration errors, defining the significance of image features, etc.); a discussion of standardized methods for computing detection limits, upper limits, and confidence intervals for weak sources; and hypothesis testing and its limitations (including the significance testing of emission lines).

Update (2/19): We have been allocated the mid-day slot of March 31. The session will run from 12:30pm till 1:30pm2pm. The tentative program is as follows:

  • Remarks on current and future trends in AstroStatistics, by Eric Feigelson
  • Poster haiku
  • F-Test theory and usage, by David van Dyk
  • Discussion on MCMC techniques, led by Andy Ptak

Update (2/26): The final program is out, and the AstroStat session is scheduled for 12:30pm-2pm at the Museum/Bunker Hill Room.

Update (4/1): The talks and posters associated with the AstroStat special session are now online at
http://hea-www.harvard.edu/AstroStat/HEAD2008/. Additional comments and descriptions will be archived there.

A bit of a mess

Due to a monumental cock-up, UK Astronomy is set to lose something like 25% of its budget. This will decimate astronomy in the UK twice over (including the VO implementation, AstroGrid), and will surely reverberate all across the world. Continue reading ‘A bit of a mess’ »

ChandraBlog

Our colleagues at Chandra public outreach have started a new blog, ChandraBlog - http://chandra.harvard.edu/blog/ which appears to be dedicated to news about the latest discoveries from Chandra. Mosey over and take a look.

The Digital Universe

Another one in the CXC/CfA Visualizing Astronomy series: “The Digital Universe: Cosmic Cartography and Data Visualization”, by Brian Abbott of Hayden Planetarium & Department of Astrophysics, next Tuesday, Nov 13, at 2pm in Phillips. Continue reading ‘The Digital Universe’ »

Clay Public Lecture: Technology-driven Statistics

I found the following from Harvard Statistics department website.

Clay Public Lecture
Technology-driven Statistics
Terry Speed, UC Berkeley and WEHI in Melbourne, Australia
Tuesday, October 30, 2007, at 7:00 PM
Harvard University Sceince Center — Hall B

Continue reading ‘Clay Public Lecture: Technology-driven Statistics’ »