نتایج جستجو برای: using a weibull statistical method

تعداد نتایج: 14294129  

Journal: :Symmetry 2022

We consider a new failure time distribution by combining three Weibull distributions. The proposed exhibits decreasing, increasing, and bathtub-shaped rate functions. Some statistical properties of the are presented. maximum likelihood method is used to estimate parameters, reliability, functions distribution, uncertainties estimates obtained using asymptotic confidence intervals. cross-entropy...

2003
Miloslav Nosal Eva-Marie Nosal

A three-parameter Weibull distribution model was developed and verified to simulate the underlying frequency distributions of observations with missing values through the entire range of observations or near and below detection limit of the monitoring equipment. The corresponding Weibull pseudo-random generator then can be used to estimate and replace the missing observations so that the origin...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه گیلان - دانشکده علوم انسانی 1392

the purpose of the present study was to investigate the effect of instruction through debate on male and female efl learners’ reading comprehension, to examine the differences between the performance of male and female participants on the five dimensions of cctst including analysis, evaluation, inference, deductive reasoning, and inductive reasoning, and to examine the differences between male ...

Journal: :Sakarya University Journal of Science 2022

Important distributions used to model and analyse data in various real-life sciences such as natural sciences, engineering, medicine are the Weibull distribution, exponential Rayleigh distribution. The main objective of this paper is determine best evaluators compare them for distribution with three-parameters Weibull, Exponential Weibull. methods under consideration comparing parameter estimat...

Journal: :gastroenterology and hepatology from bed to bench 0
ahmad reza baghestani department of biostatistics, faculty of paramedical sciences, shahid beheshti university of medical sciences, tehran, iran mahmood reza gohari department of biostatistics, iran university of medical sciences, tehran, iran arezoo orooji department of biostatistics, faculty of paramedical sciences, shahid beheshti university of medical sciences, tehran, iran mohamad amin pourhoseingholi gastroenterology and liver diseases research center, shahid beheshti university of medical sciences, tehran, iran

background and objectives: survival models are statistical technique to estimate or predict the overall time up to specific events. prediction is important in medical science and the accuracy of prediction is determined by a measurement, generally based on loss functions, called prediction error. the aim of this study is using parametric models to determine the factors influencing predicted sur...

2013
Reiner Lenz Vasileios Zografos

We introduce a method to combine the color channels of an image to a scalar valued image. Linear combinations of the RGB channels are constructed using the Fisher-Trace-Information (FTI), defined as the trace of the Fisher information matrix of the Weibull distribution, as a cost function. The FTI characterizes the local geometry of the Weibull manifold independent of the parametrization of the...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه اصفهان - دانشکده علوم تربیتی و روانشناسی 1388

چکیده هدف اصلی این پژوهش تعیین رابطه استراتژیهای خود رهبری و خلاقیت اعضای هیات علمی دانشگاه علم و صنعت بوده است. در این پژوهش از روش توصیفی از نوع همبستگی استفاده شده است. جامعه آماری پژوهش کلیه اعضای هیات علمی دانشگاه علم و صنعت در سال تحصیلی 88-1387 بود که بالغ بر345 نفربودندو از این تعداد، 119 نفر استاد با استفاده از روش نمونه گیری تصادفی طبقه ای متناسب با حجم انتخاب شد. ابزار جمع آوری داده...

2015
Suk-Bok Kang Jun-Tae Han

Many studies have considered a truncated and censored samples which are type-I, type-II and hybrid censoring scheme. The inverse Weibull distribution has been utilized for the analysis of life testing and reliability data. Also, this distribution is a very flexible distribution. The inverse Rayleigh distribution and inverse exponential distribution are a special case of the inverse Weibull dist...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده علوم پایه 1394

چکیده در این پایان نامه ضمن معرفی توزیع وایبل، برآوردگر درستنمایی ماکزیمم و بیز پارامتر مقیاس توزیع وایبل با داده های سانسور شده را با استفاده از توزیع پیشین جفری و توزیع پیشین جفری تعمیم یافته تحت توابع میانگین مربع خطا و میانگین درصد خطا محاسبه و با یکدیگر مقایسه شده اند. در پایان ضمن مقایسه کارایی برآوردگرها نتیجه می شود که پارامتر برآورد شده توزیع وایبل بدست آمده از روش بیز با توزیع پیشین ...

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