Stan: A Probabilistic Programming Language

Stan is a probabilistic programming language for specifying statistical models. A Stan program imperatively defines a log probability function over parameters conditioned on specified data and constants. As of version 2.14.0, Stan provides full Bayesian inference for continuous-variable models through Markov chain Monte Carlo methods such as the No-U-Turn sampler, an adaptive form of Hamiltonian Monte Carlo sampling. Penalized maximum likelihood estimates are calculated using optimization methods such as the limited memory Broyden-Fletcher-Goldfarb-Shanno algorithm. Stan is also a platform for computing log densities and their gradients and Hessians, which can be used in alternative algorithms such as variational Bayes, expectation propagation, and marginal inference using approximate integration. To this end, Stan is set up so that the densities, gradients, and Hessians, along with intermediate quantities of the algorithm such as acceptance probabilities, are easily accessible. Stan can be called from the command line using the cmdstan package, through R using the rstan package, and through Python using the pystan package. All three interfaces support sampling and optimization-based inference with diagnostics and posterior analysis. rstan and pystan also provide access to log probabilities, gradients, Hessians, parameter transforms, and specialized plotting

MAGIQ at the W. M. Keck Observatory: initial deployment of a new acquisition, guiding, and image quality monitoring system

The W. M. Keck Observatory has completed the development and initial deployment of MAGIQ, the Multi-function Acquisition, Guiding and Image Quality monitoring system. MAGIQ is an integrated system for acquisition, guiding and image quality measurement for the Keck telescopes. This system replaces the acquisition and guiding hardware and software for existing instruments at the Observatory and is now the standard for visible wavelength band acquisition cameras for future instrumentation. In this paper we report on the final design and implementation of this new system, which includes three major components: a visible wavelength band acquisition camera, image quality measurement capability, and software for acquisition, guiding and image quality monitoring. The overall performance is described, as well as the details of our approach to integrating low order wavefront sensing capability in order to provide closed loop control of telescope focus

MAGIQ at the W. M. Keck Observatory: initial deployment of a new acquisition, guiding, and image quality monitoring system

The W. M. Keck Observatory has completed the development and initial deployment of MAGIQ, the Multi-function Acquisition, Guiding and Image Quality monitoring system. MAGIQ is an integrated system for acquisition, guiding and image quality measurement for the Keck telescopes. This system replaces the acquisition and guiding hardware and software for existing instruments at the Observatory and is now the standard for visible wavelength band acquisition cameras for future instrumentation. In this paper we report on the final design and implementation of this new system, which includes three major components: a visible wavelength band acquisition camera, image quality measurement capability, and software for acquisition, guiding and image quality monitoring. The overall performance is described, as well as the details of our approach to integrating low order wavefront sensing capability in order to provide closed loop control of telescope focus

Keck-I MOSFIRE Spectroscopy of Compact Star-Forming Galaxies at \u3cem\u3ez\u3c/em\u3e ≳ 2: High Velocity Dispersions in Progenitors of Compact Quiescent Galaxies

We present Keck-I MOSFIRE near-infrared spectroscopy for a sample of 13 compact star-forming galaxies (SFGs) at redshift 2 ≤ z ≤ 2.5 with star formation rates of SFR ~ 100 M ☉ yr–1 and masses of log(M/M ☉) ~10.8. . . . For the remainder of the abstract, please visit: http://dx.doi.org/10.1088/0004-637X/795/2/14

University Reporter Issue 5

Readers/Writers Letters By: Unknown (2) Students Speak Out: By: Unknown (2) Citizens’ Groups Assert Their Rights By: Jean Buchanan (3) Community Councils in Anchorage By: Unknown (3) 6 Positions Filled, 2 Still Vacant Students Ignore Campus Elections By: Jim Kelly (4) Fate of P.E. Complex to be Decided in Juneau By: Bob Lagerley (4) ACCFT Offers 2 Scholarships By: Unknown (4) A Case For Birth At Home By: Megan Andersen (5) Birth References By: Unknow (5) Humanities on the move: By: Kathyrine Goodrich (6) CAS By: Dr. James Wilson (6) Broderick Rejects Rivalry between Colleges at UAA By: Dr. Donna H. Broderick (6) Division of Science and Mathematics: Changes at CAS By: Dr. Stephen Horrell (7) ACC Program needs Faculty & Equipment By: Kathyrine Goodrick (7) The Native Nations and the Native of Alaska By: Unknown (8) What’s in store for Social Sciences at ACC? By: Kathyrine Goodrich (10) And at CAS? By: Dr. Richard Bruce (10) Undergraduate Social Work Program By: M. L. Nicholson and c Kleinkauf (10) Making of Martial Artist By: Barbara Jackson (11) Spontaneous Intercourse By: Buffy Gullberg (11) Music Review By: Michelle Colemen (11) Flying High in Alaskan Skies Freedom and Safety By: Ray Huard (12) Natural Food is Fare At This Store By: Unknown (12) Springfest Activities Planned By: Unknown (12) Assemblyman Gives Plan How to Study A Government By: Tony Knowles (13) The Student Ombudsman Tell It To Roy By: Roy Huard (13) The Print Switchboard (15) Community Calendar (16

Farming with your hoe in a sack: condom attitudes, access, and use in rural Tanzania.

This study examines condom knowledge, attitudes, access, and practices in rural Mwanza, Tanzania. From 1999-2002, six researchers carried out participant observation in nine villagesfor a total of 158 person-weeks. Many villagers perceived condoms negatively for multiple reasons, for example, the method's association with infection or promiscuity, reduced male sexual pleasure, and cultural understandings of meaningful sex. Men controlled the terms of sexual encounters and reported that they would use condoms only with risky partners, but few perceived their partners as such. Use of condoms appeared to be very low, primarily as a result of limited demand, although barriers to access also existed. These qualitative findings contrast with inconsistent survey reports of relatively high condom use in the same population. Intervention efforts should address the tradeoff between possible short- and long-term consequences of condom use, particularly for men, for example, reduced pleasure versus reduced HIV risk. If possible, surveys should assess the validity of reported condom use through comparison with other data, including qualitative findings and distribution/sales records