Jul 29th, 2009| 01:02 am | Posted by hlee
Speaking of XAtlas from my previous post I tried another visualization tool called Parallel Coordinates on these Capella observations and two stars with multiple observations (AL Lac and IM Peg). As discussed in [MADS] Chernoff face, full description of the catalog is found from XAtlas website. The reason for choosing these stars is that among low mass stars, next to Capella (I showed 16), IM PEG (HD 21648, 8 times), and AR Lac (although different phases, 6 times) are most frequently observed. I was curious about which variation, within (statistical variation) and between (Capella, IM Peg, AL Lac), is dominant. How would they look like from the parametric space of High Resolution Grating Spectroscopy from Chandra? Continue reading ‘[MADS] Parallel Coordinates’ »
Tags:
Classification,
clustering,
display,
EDA,
eye catcher,
GGobi,
Inselberg,
parallel coordinates,
visualization Category:
Algorithms,
arXiv,
Cross-Cultural,
Data Processing,
High-Energy,
Jargon,
Methods,
Spectral,
X-ray |
3 Comments
Apr 2nd, 2009| 12:00 pm | Posted by hlee
I cannot remember when I first met Chernoff face but it hooked me up instantly. I always hoped for confronting multivariate data from astronomy applicable to this charming EDA method. Then, somewhat such eager faded, without realizing what’s happening. Tragically, this was mainly due to my absent mind. Continue reading ‘[MADS] Chernoff face’ »
Tags:
calibration,
Capella,
Chandra,
Chernoff face,
EDA,
line ratios,
MADS,
XAtlas Category:
Algorithms,
arXiv,
Astro,
Cross-Cultural,
Data Processing,
Jargon,
Methods,
Misc,
News,
Quotes,
Spectral,
Stars,
X-ray |
2 Comments
Jan 25th, 2008| 12:53 pm | Posted by hlee
I have been observing some sorts of misconception about statistics and statistical nomenclature evolution in astronomy, which I believe, are attributed to the lack of references in the astronomical society. There are some textbooks designed for junior/senior science and engineering students, which are likely unknown to astronomers. Example-wise, these books are not suitable, to my knowledge. Although I never expect astronomers to learn standard graduate (mathematical) statistics textbooks, I do wish astronomers go beyond Numerical Recipes (W. H. Press, S. A. Teukolsky, W. T. Vetterling, & B. P. Flannery) and Error Data Reduction and Analysis for the Physical Sciences (P. R. Bevington & D. K. Robinson). Here are some good ones written by astronomers, engineers, and statisticians: Continue reading ‘Books – a boring title’ »
Tags:
application,
Bayesian,
book,
books,
box plot,
cartoon,
chi-square,
CLT,
correlation,
delta method,
EDA,
error bars,
Frequentist,
gaussian,
references,
scatter plot Category:
Cross-Cultural,
Data Processing,
Misc,
Stat |
12 Comments