Results 61 to 70 of about 3,789,491 (216)

The sample size required in importance sampling [PDF]

arXiv, 2015
The goal of importance sampling is to estimate the expected value of a given function with respect to a probability measure $\nu$ using a random sample of size $n$ drawn from a different probability measure $\mu$. If the two measures $\mu$ and $\nu$ are nearly singular with respect to each other, which is often the case in practice, the sample size ...
arxiv  

On Sample Size Determination [PDF]

MATHEMATICAL JOURNAL OF INTERDISCIPLINARY SCIENCES, 2014
One of the questions most frequently asked of a statistician is: how big should the sample be? Managers are anxious to obtain an answer to this fundamental question during the planning phase of the survey since it impacts directly on operational considerations such as the number of interviewers required.
openaire   +1 more source

Second Order Expansions for Sample Median with Random Sample Size [PDF]

arXiv, 2019
In practice, we often encounter situations where a sample size is not defined in advance and can be a random value. The randomness of the sample size crucially changes the asymptotic properties of the underlying statistic. In the present paper second order Chebyshev--Edgeworth and Cornish--Fisher expansions based of Student's $t$- and Laplace ...
arxiv  

Navigating Sample Size Estimation for Qualitative Research

Journal of Medical Evidence
There are well-established rules and methods about sample size estimation in quantitative research approaches. However, qualitative research approaches justify very little about sample size estimation principles and largely depend on subjective ...
Suresh K. Sharma, Shiv Kumar Mudgal, Rakhi Gaur, Jitender Chaturvedi, Satyaveer Rulaniya, Priya Sharma   +5 more
doaj   +1 more source

Mini-batch stochastic gradient descent with dynamic sample sizes [PDF]

arXiv, 2017
We focus on solving constrained convex optimization problems using mini-batch stochastic gradient descent. Dynamic sample size rules are presented which ensure a descent direction with high probability. Empirical results from two applications show superior convergence compared to fixed sample implementations.
arxiv  

Sample size calculation formula in "before-after" intervention studies with qualitative outcomes [PDF]

Payesh
Dear Editor, In “before-after" intervention studies with qualitative outcome(s), we should not use the same formula when the outcome(s) are quantitative since the appropriate variance in this formula are not used and thus the sample size will not have ...
Ali Asghar Haeri-Mehrizi, Jila Sadighi
doaj  

Sample Size Estimation in Clinical Trials

National Journal of Community Medicine
Sample size estimation remains as a cornerstone in the meticulous planning and execution of clinical trials, pivotal for ensuring studies possess the requisite statistical power to discern meaningful treatment effects.
Divyangkumar Patel
doaj   +1 more source

Estimating sample size in dental research [PDF]

arXiv
Determination of sample size is critical, however not easy to do. Sample size defined as the number of observations in a sample should be big enough to have a high likelihood of detecting a true difference between groups. Practical procedure for determining sample size, using G*power and previous dental articles, is shown in this study.
arxiv  

ESTIMATION OF ITEM‐CRITERION CORRELATION WITH MINIMUM SAMPLING ERROR FOR A GIVEN SAMPLE SIZE [PDF]

, 1951
Miles S. Rogers
openalex   +1 more source

Analysis of Noisy Evolutionary Optimization When Sampling Fails [PDF]

arXiv, 2018
In noisy evolutionary optimization, sampling is a common strategy to deal with noise. By the sampling strategy, the fitness of a solution is evaluated multiple times (called \emph{sample size}) independently, and its true fitness is then approximated by the average of these evaluations.
arxiv