More missing neutrinos

How to Get Less Helium and More Neutrinos from Bbn

The predicted primordial He abundance Y increases with the expansion rate of the Universe during the big bang nucleosynthesis(BBN). This has been used to put limits on the number of neutrinos, quintessence models, and other new physics. At present, there are still large systematic errors in measurement of the primordial helium abundance. Oliver and Steigman obtained Y = 0.234 ± 0.003(stat.), wh...

Can We Learn Something More on Oscillations from Atmospheric Neutrinos?

We show that for long-baseline experiments using a Mt water Čerenkov detector atmospheric neutrino data provide a powerful method to resolve parameter degeneracies. In particular, the combination of long-baseline and atmospheric data increases significantly the sensitivity to the neutrino mass hierarchy and the octant of θ23. Furthermore, we discuss the possibility to use μlike atmospheric neut...

Missing No More: Using the MCMC Procedure to Model Missing Data

Missing data are often a problem in statistical modeling. The Bayesian paradigm offers a natural modelbased solution for this problem by treating missing values as random variables and estimating their posterior distributions. This paper reviews the Bayesian approach and describes how the MCMC procedure implements it. Beginning with SAS/STAT® 12.1, PROC MCMC automatically samples all missing va...

Systematic viewing in radiology: seeing more, missing less?

To prevent radiologists from overlooking lesions, radiology textbooks recommend "systematic viewing," a technique whereby anatomical areas are inspected in a fixed order. This would ensure complete inspection (full coverage) of the image and, in turn, improve diagnostic performance. To test this assumption, two experiments were performed. Both experiments investigated the relationship between s...

The missing link...is much more than just safety.