Transient events in LSST survey data

Porting the LSST Data Management Pipeline Software to Python 3

The LSST data management science pipelines software consists of more than 100,000 lines of Python 2 code. LSST operations will begin after support for Python 2 has been dropped by the Python community in 2020, and we must therefore plan to migrate the codebase to Python 3. During the transition period we must also support our community of active Python 2 users and this complicates the porting s...

Resampling Methods in Complex Survey Data

Survey of Life Events Prior to Suicide Attempt

Abstract Stressful life events are seen frequently, prior to suicide in persons who attempted. This study was done to survey problematic life events prior to suicide attempt in patients who had been admitted in emergency ward of Razi Hospital in Rasht 2001. To achieve this goal , 173 patients who had been admitted due to suicide attempt were interviewed by two trained male and female general ...

Optical selection of quasars: SDSS and LSST

Over the last decade, quasar sample sizes have increased from several thousand to several hundred thousand, thanks mostly to SDSS imaging and spectroscopic surveys. LSST, the next-generation optical imaging survey, will provide hundreds of detections per object for a sample of more than ten million quasars with redshifts of up to about seven. We briefly review optical quasar selection technique...

Dynamic Frailty and Change Point Models for Recurrent Events Data

Abstract. We present a Bayesian analysis for recurrent events data using a nonhomogeneous mixed Poisson point process with a dynamic subject-specific frailty function and a dynamic baseline intensity func- tion. The dynamic subject-specific frailty employs a dynamic piecewise constant function with a known pre-specified grid and the baseline in- tensity uses an unknown grid for the piecewise ...