نتایج جستجو برای: current sample

تعداد نتایج: 1148585  

Journal: :Journal of Baghdad College of Dentistry 2022

Background: Recurrent aphthous stomatitis (RAS) is one of the most common oral mucosal disorders with a prevalence 50-66%. The hematinic deficiencies including ferritin and vitamin B12 their role in prophylaxis development RAS not well known. Many studies have demonstrated high patients RAS. This study aimed to compare serum level recurrent ulcers healthy controls. Subjects, Materials Methods: ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1388

چکیده: فرض کنید که تابعی از اپسیلون یک مجموع نامتناهی از احتمالات موزون مربوط به مجموع های جزئی براساس یک دنباله از متغیرهای تصادفی مستقل و همتوزیع باشد، و همچنین فرض کنید توابعی مانند g و h وجود دارند که هرگاه امید ریاضی توان دوم x متناهی و امیدریاضی x صفر باشد، در این صورت می توان حد حاصلضرب این توابع را بصورت تابعی از امید ریاضی توان دوم x نوشت. حالت عکس نیز برقرار است. همچنین ما با استفاده...

Journal: :journal of nanostructures 2015
m. ahmadzadeh m. almasi-kashi

cofecu nanowires were deposited by pulsed electrodeposition technique into the porous alumina templates by a two-step mild anodization technique, using the single-bath method. the electrodeposition was performed in a constant electrolyte while cu constant was controlled by electrodeposition current. the electrodeposition current was 3.5, 4.25, 5 and 6 ma. the effect of electrodeposition current...

2015
Jonathan A Cook Jenni Hislop Douglas G Altman Peter Fayers Andrew H Briggs Craig R Ramsay John D Norrie Ian M Harvey Brian Buckley Dean Fergusson Ian Ford Luke D Vale

BACKGROUND Central to the design of a randomised controlled trial is the calculation of the number of participants needed. This is typically achieved by specifying a target difference and calculating the corresponding sample size, which provides reassurance that the trial will have the required statistical power (at the planned statistical significance level) to identify whether a difference of...

Journal: :Statistics in medicine 1998
F Y Hsieh D A Bloch M D Larsen

A sample size calculation for logistic regression involves complicated formulae. This paper suggests use of sample size formulae for comparing means or for comparing proportions in order to calculate the required sample size for a simple logistic regression model. One can then adjust the required sample size for a multiple logistic regression model by a variance inflation factor. This method re...

Journal: :Controlled clinical trials 2003
Roger P Qu Hongjie Zheng

Exact power and sample size calculation for bioequivalence studies with high order crossover designs using statistical software nQuery are presented. Such calculation can be very easily performed, and thus provides a convenient tool for practical usage.

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