نتایج جستجو برای: raticide sample

تعداد نتایج: 407461  

Journal: :Journal of theoretical biology 2016
Krzysztof Bartoszek

In this paper I address the question-how large is a phylogenetic sample? I propose a definition of a phylogenetic effective sample size for Brownian motion and Ornstein-Uhlenbeck processes-the regression effective sample size. I discuss how mutual information can be used to define an effective sample size in the non-normal process case and compare these two definitions to an already present con...

2013
Jeehyoung Kim Bong Soo Seo

WHY Calculating the sample size is essential to reduce the cost of a study and to prove the hypothesis effectively. HOW Referring to pilot studies and previous research studies, we can choose a proper hypothesis and simplify the studies by using a website or Microsoft Excel sheet that contains formulas for calculating sample size in the beginning stage of the study. MORE There are numerous ...

2013
Mohamad Amin Pourhoseingholi Mohsen Vahedi Mitra Rahimzadeh

Optimum sample size is an essential component of any research. The main purpose of the sample size calculation is to determine the number of samples needed to detect significant changes in clinical parameters, treatment effects or associations after data gathering. It is not uncommon for studies to be underpowered and thereby fail to detect the existing treatment effects due to inadequate sampl...

Journal: :Animal behaviour 1997
Schwagmeyer Mock

No abstract

Journal: :American journal of epidemiology 2004
Guangyong Zou

Relative risk is usually the parameter of interest in epidemiologic and medical studies. In this paper, the author proposes a modified Poisson regression approach (i.e., Poisson regression with a robust error variance) to estimate this effect measure directly. A simple 2-by-2 table is used to justify the validity of this approach. Results from a limited simulation study indicate that this appro...

Journal: :Fundamental & clinical pharmacology 2003
Stuart J Pocock

Noninferiority trials comparing new treatment with an active standard control are becoming increasingly common. This article discusses relevant issues regarding their need, design, analysis and interpretation: the appropriate choice of control group, types of noninferiority trial, ethical considerations, sample size determination and potential pitfalls to consider.

Journal: :British medical journal 1980
D G Altman

The term "design" encompasses all the structural aspects of a study, notably the definition of the study sample, size of sample, method of treatment allocation, type of statistical design (randomised, cross-over, sequential, etc), and choice of outcome measures. The importance of this stage cannot be overemphasised since no amount of clever analysis later will be able to compensate for major de...

Journal: :Statistics in medicine 1997
L Joseph R du Berger P Bélisle

Sample size estimation is a major component of the design of virtually every experiment in medicine. Prudent use of the available prior information is a crucial element of experimental planning. Most sample size formulae in current use employ this information only in the form of point estimates, even though it is usually more accurately expressed as a distribution over a range of values. In thi...

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