scispace - formally typeset
Search or ask a question

How reliable is Direct sampling for data collection method? 


Best insight from top research papers

Direct sampling is a reliable method for data collection in various fields. The method allows for generating draws from weighted distributions with potentially intractable normalizing constants. It has been successfully applied in scenarios requiring draws from unfamiliar distributions, such as the Conway-Maxwell Poisson distribution and Gibbs samplers for different parameters. In the context of inverse scattering problems, direct sampling methods have been developed for location and shape reconstruction based on far field patterns, showcasing simplicity, speed, and stability even with noisy data and limited observation directions. Additionally, in the realm of electromagnetic medium scattering, a direct sampling method has been devised for estimating the support and shape of medium scatterers, proving to be computationally efficient and robust against data noise in both two- and three-dimensional scenarios.

Answers from top 4 papers

More filters
Papers (4)Insight
Open accessJournal ArticleDOI
Xia Ji, Xiaodong Liu, Yingxia Xi 
12 Citations
Direct sampling methods for inverse elastic scattering problems are highly reliable due to simplicity, fast implementation, stability to data errors, and effectiveness even with noisy data and limited-aperture scenarios.
Open accessJournal ArticleDOI
Xia Ji, Xiaodong Liu, Yingxia Xi 
12 Feb 2018-Inverse Problems
20 Citations
Direct sampling methods for inverse elastic scattering problems are highly reliable due to simplicity, speed, stability to data errors, and effectiveness even with noisy data and limited-aperture scenarios.
Direct sampling with a step function enhances reliability by approximating densities, reducing manual tuning, and enabling exact draws with lower rejection rates, making it a dependable data collection method.
Direct sampling with a step function enhances reliability by approximating densities, reducing manual tuning, and enabling exact draws with lower rejection rates, making it a reliable data collection method.

Related Questions

Why sampling is important in research?4 answersSampling is important in research because it allows researchers to select a subset of the population of interest for data collection and analysis. Sampling helps to reduce the cost, time, and workload of studying an entire population, while still providing high-quality information that can be extrapolated to the entire population. It is difficult and sometimes impossible to study every individual in a population, so sampling allows researchers to make inferences about the population based on observations made on the sample. Sampling also helps to ensure that the sample is a true representation of the population, which is crucial for making valid inferences. Different research approaches, such as quantitative and qualitative research, have different sampling considerations, but both rely heavily on non-probability samples. Probability sampling, where all members of the target population have a known and random chance of being selected, is ideal but often impractical. Therefore, careful planning and consideration of the sampling strategy is necessary to ensure the validity of research conclusions.
What is a non-probability sampling technique?5 answersNon-probability sampling is a technique used in research where participants are not selected randomly from the population. Instead, the selection is based on non-random criteria, such as convenience or judgment. Non-probability sampling methods are commonly used in situations where it is difficult or impractical to obtain a random sample. These methods have some potential flaws and are insufficient to represent all sampling procedures involving human participants. Authors often mistakenly believe they are using random sampling techniques when they are actually using non-random methods. Non-probability sampling techniques do not allow for direct or indirect estimation of population characteristics.
What are characteristics of direct method?4 answersDirect methods have several characteristics. Firstly, they aim to determine the ultimate load carrying capacity of structures beyond the elastic range. Secondly, direct methods involve solving nonlinear convex optimization problems with a large number of variables and constraints. Thirdly, direct methods can be formulated as stochastic programming problems when strength and loading are random quantities. Fourthly, direct methods in medical image analysis eliminate the need for intermediate steps such as segmentation, registration, and tracking, making them more clinically significant. Lastly, direct methods for estimating hydrogeological model parameters directly incorporate observed data without iterative parameter updates, making them computationally efficient and robust to observation errors.
What is SAMPLING in research?4 answersSampling in research refers to the process of selecting a subset or sample from a larger population for the purpose of making observations and drawing inferences about the population under study. It is a statistical method used to reduce cost, time, and workload while providing high-quality information that can be extrapolated to the entire population. The selection of a representative sample is crucial to ensure that the inferences drawn from the analysis can be applied to the population. Different sampling techniques, such as probability and non-probability sampling, are used depending on the research goals and constraints. Probability sampling involves random selection methods and aims to maximize the statistical representativeness of the population, while non-probability sampling techniques, such as convenience sampling, are more commonly used due to practical constraints. Proper planning and consideration of sample size are essential for both quantitative and qualitative research to ensure the validity and generalizability of research findings.
How the effective of direct mailing strategy, where the self-sampling kit was mailed directly to the woman's home,?3 answersDirect mailing of self-sampling kits to women's homes has been shown to be an effective strategy for increasing cervical cancer screening uptake. Studies have found that mailing HPV self-sampling kits to underscreened women in integrated US health care systems is cost-effective and can significantly increase screening rates. In a Canadian study, the return rate of mailed kits was high, and the majority of patients were very satisfied with this method. Offering HPV self-sampling through mail service could increase access to cervical cancer screening, particularly for under-screened populations. However, a study conducted in France found that home-mailed delivery of self-sampling kits was superior to GP delivery in increasing participation in cervical cancer screening. Another study conducted in Japan showed that self-collected HPV tests were effective in increasing screening rates among individuals who had not undergone recommended cervical cancer screenings.
How does the direct method work?5 answersThe direct method is a computational mechanics approach used in mechanical and civil engineering design to determine the ultimate load carrying capacity of structures beyond the elastic range. It involves solving nonlinear convex optimization problems with a large number of variables and constraints. In the context of shakedown analysis, which deals with random conditions of strength, a method called chance constrained programming is used to solve the problem. This method is an effective form of stochastic programming that considers strength as a normally or lognormally distributed variable. The direct method for designing distributed controllers achieves component swapping modularity (CSM) by directly obtaining the distributed controller gains through solving a bilevel optimization problem. For optimal switching problems of one-dimensional diffusions, the direct method characterizes the value function as sets of the smallest linear majorants in their respective transformed spaces, without requiring conjectures or quasi-variational inequalities.