What is the size of ADNI2 dataset size?5 answersThe size of the ADNI2 dataset is not mentioned in the provided abstracts.
What is the minimum sample size required for a reliable study?4 answersThe minimum sample size required for a reliable study depends on the specific research question and methodology. Ramos and Macau investigated the minimum sample size for reliable causal inference in non-stationary systems using Transfer Entropy. Yang and Wu proposed a methodological framework to determine the minimum sample size for stable distributions of freeway travel times, recommending a minimum sample size of 65 weeks for travel time reliability measurements. Nundy, Kakar, and Bhutta emphasized the importance of finding an adequate sample size that serves the purpose of the study, avoiding underpowered or unnecessarily large studies. Yang, Yao, Qu, and Zhang developed a minimum sample size forecasting model for reliable traffic information, considering factors such as road condition and traffic status. Alluri, Saha, and Gan determined the minimum sample sizes for estimating reliable calibration factors for different types of roadways, based on Florida data.
The larger the dataset, the larger the KNN model?5 answersThe size of the KNN model does not necessarily increase with the size of the dataset. The performance of KNN models can be affected by changing the total number of nearest neighbors, but this does not directly correlate with the dataset size. In fact, there are approaches that aim to minimize the computational cost of constructing KNN graphs for large datasets, such as leveraging disk and main memory efficiently. Additionally, a strategy that samples and keeps only the least popular features of each entity has been shown to reduce computational time while still producing a KNN graph close to the ideal one. Therefore, the size of the KNN model can be controlled and optimized based on factors other than the dataset size.
What is the minimum sample size required for a study?5 answersThe minimum sample size required for a study depends on various factors such as the research question, study design, and statistical techniques used. Researchers need to have a sound understanding of inferential statistics and effect sizes to determine the appropriate sample size for their study. In clinical studies, especially randomized controlled trials, it is important to ensure optimal power and confidence level, making sample size exploration mandatory. Different study designs may require different sample size requirements, with a minimum sample size of 300 or more necessary for clinical surveys conducted in a non-experimental manner. In the field of computational chemistry, the minimum sample size required for comparing two models depends on factors such as confidence, power, correlation coefficients, and intercorrelation between the models. In qualitative research, the minimum sample size needed to adequately include themes and codes can vary, but rich qualitative findings can be discovered with relatively small sample sizes.
How does dataset sample size affect deep learning?5 answersThe sample size of a dataset has a significant impact on the performance of deep learning models. For image classification tasks, a large training sample is necessary for successful training of deep learning models. However, collecting a large dataset can be time-consuming and costly, especially for certain domains like plants. In such cases, data augmentation techniques can be used to improve the learning accuracy by oversampling the available small or medium-sized dataset. Deep learning models tend to struggle with small sample size (S3) problems and specialized solutions are required. It has been observed that deep learning models do not generalize well on S3 problems, and the performance can be improved by using techniques like dynamic attention pooling. Stability in deep learning models is achieved with larger sample sizes, typically exceeding 5000 cases.
How to improve efficiency of a machine learning model with small dataset?5 answersTo improve the efficiency of a machine learning model with a small dataset, there are several approaches that can be taken. One method is to use meta-learning, which involves training a model on a variety of learning tasks so that it can quickly adapt to new tasks with only a small amount of training data. Another approach is to use structured or sketched updates, which reduce the communication costs in federated learning by learning updates from a restricted space or compressing them before sending to the server. Additionally, automated machine learning (AutoML) systems can be used to automatically choose the best algorithm, feature preprocessing steps, and hyperparameters for a given dataset, taking into account past performance on similar datasets. These methods have been shown to improve the performance and efficiency of machine learning models with small datasets.