What is the sample in research?5 answersIn research, a sample refers to a subset of the population of interest selected for study. Sampling is a crucial process that involves choosing cases for analysis to draw meaningful research conclusions. It is impractical to study an entire population, so researchers rely on samples, which are smaller groups representing the population. Sampling techniques can be categorized into probability sampling, where every member has a known chance of selection, and non-probability sampling, which is more common due to practical constraints. The quality of research findings heavily relies on appropriate sampling methods to ensure the validity and generalizability of conclusions. Understanding the differences between qualitative and quantitative sampling approaches is essential for researchers to design high-quality research studies across paradigms.
What is sample in research?4 answersSampling in research refers to the process of selecting a subset of the population of interest for data collection. It is a crucial step in research as it is often not feasible to include the entire population. Sampling allows for practicality, faster data collection, and lower costs. The selected sample is used to make inferences about the larger population. Understanding the means by which the data arrived in the database is important for analyzing and drawing conclusions from the data. Sampling can be based on probability theory, where a representative group of units or cases is drawn from the population. Sample size determination is a critical aspect of sampling, as it affects the validity and reliability of the research findings. Factors such as study design, primary outcome, sampling method, effect size, power, and standard deviation need to be considered when determining the sample size. The sample size should be appropriate to identify statistically significant differences and obtain scientifically valid results. The survey questionnaire is the tool used to collect data from the sample, and the sample size refers to the total number of individuals for whom the survey is sent.
What is matlab23?5 answersMATLAB is a powerful software tool widely used in scientific and engineering areas. It is a MATLAB-based software tool called MuMag2022 that is used for the analysis of magnetic-field-dependent unpolarized small-angle neutron scattering data of bulk ferromagnets. MATLAB is also used for numerical solution of parameter optimization problems with nonlinear constraints using the accelerated gradient method. It is a versatile tool in mathematics, modeling, simulations, numerical analysis, and processing algorithms and graphical views. MATLAB also offers parallel computing capabilities through the Parallel Computing Toolbox™ and MATLAB Distributed Computing Server™. Additionally, MATLAB provides functionalities to work with DICOM data.
What makes a good sample?4 answersA good sample is one that is representative of the study population and is selected in a manner that ensures its validity and reliability. The sample should be chosen randomly or non-randomly, depending on the research objectives and the characteristics of the study population. Additionally, the sample quality criteria should be clearly defined, including the question being addressed, the decision unit, and the desired level of confidence. The decision unit refers to the specific material to which inferences and decisions will be made, and its precise determination is crucial for accurate and cost-effective decision-making. Overall, a good sample is obtained by carefully considering the objectives of the research, selecting a representative subset of the study population, and ensuring the appropriate sample quality criteria are met.
What type of sampling if using selected archieve samples?5 answersSelected archive samples would fall under the category of nonprobability sampling. Nonprobability sampling methods do not involve randomization and include convenience or accidental sampling, purposive sampling, quota sampling, volunteer sampling, and expert sampling.
What is sample selection for machine learning and why is it important?2 answersSample selection for machine learning refers to the process of choosing the most informative samples from a dataset to train a model. It is important because selecting the right samples can improve the performance of the model while minimizing the need for labeled data, reducing expert interventions, and saving costs. In medical image analysis tasks, active learning (AL) methods for sample selection have been effective in boosting the performance of computer-aided diagnosis systems when labeled samples are limited. Conventional approaches to AL have mostly focused on the single label setting, but they do not perform optimally in the multi-label setting where a sample can have multiple disease labels. To address this, a novel sample selection approach based on graph analysis has been proposed, which identifies informative samples in a multi-label setting by characterizing similarity between interpretability saliency map model encodings. Additionally, in the context of iron and steel enterprises, sample selection based on deep Bayesian active learning has been used to reduce the number of redundant samples, improve prediction accuracy, and reduce algorithm running time.