A new method to perform data-model comparison in <i>Fermi</i>-LAT analysis
نویسندگان
چکیده
The analysis of Fermi Large Area Telescope (LAT) gamma-ray data in a given Region Of Interest (RoI) usually consists performing binned log-likelihood fit order to determine the sky model that, after convolution with instrument response, best accounts for distribution observed counts. While tools are available perform such fit, it is not easy check goodness-of-fit. difficulty assessment data/model agreement twofold. First all, and predicted counts three dimensions (two spatial one energy dimension) comparing two 3D maps straightforward. Secondly, source spectra generally decrease as inverse square. As consequence number above several GeV falls into Poisson regime, which precludes simple $\chi^2$ test. We propose method that overcomes these obstacles by producing spatially integrated count at each pixel analysed RoI. comparison performed following approach extends test histograms low statistics. This can take account likelihood weights used systematic uncertainties. optimize new so provides fast reliable tool assess goodness-of-fit Fermi-LAT we use latest catalog on 10~years data.
منابع مشابه
a new approach to credibility premium for zero-inflated poisson models for panel data
هدف اصلی از این تحقیق به دست آوردن و مقایسه حق بیمه باورمندی در مدل های شمارشی گزارش نشده برای داده های طولی می باشد. در این تحقیق حق بیمه های پبش گویی بر اساس توابع ضرر مربع خطا و نمایی محاسبه شده و با هم مقایسه می شود. تمایل به گرفتن پاداش و جایزه یکی از دلایل مهم برای گزارش ندادن تصادفات می باشد و افراد برای استفاده از تخفیف اغلب از گزارش تصادفات با هزینه پائین خودداری می کنند، در این تحقیق ...
15 صفحه اولA New Group Data Envelopment Analysis Method for Ranking Design Requirements in Quality Function Deployment
Data envelopment analysis (DEA) is an objective method for priority determination of decision making units (DMUs) with the same multiple inputs and outputs. DEA is an efficiency estimation technique, but it can be used for solving many problems of management such as rankig of DMUs. Many researchers have found similarity between DEA and MCDM techniques. One of the earliest techniques in MCDM is...
متن کاملA new method to perform quantitative measurement of bronchoscopic images.
Bronchoscopy is a commonly used clinical tool that provides a direct image of the bronchial lumen. However, bronchoscopy has seen little use as a quantitative measurement tool, mainly because of the wide-angle lens which distorts the image. The present authors have tested the ability of numerical algorithms and commercial software to correct for this distortion. Test objects of known size were ...
متن کاملA method to consider Non-Discretionary factors in Data Envelopment Analysis
The technique for efficiency measurement known as Data Envelopment Analysis (DEA) has been extended to allow on-discretionary inputs that affect production. Several methods exist for measuring efficiency to control these factors in production. This paper review these approaches, providing a discussion of strengths and weaknesses and highlighting potential limitations. In addition, a new approac...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy and Astrophysics
سال: 2021
ISSN: ['0004-6361', '1432-0746']
DOI: https://doi.org/10.1051/0004-6361/202141553