clinical research usually involves patients with a certain disease or a condition. the generalizability of clinical research findings is based on multiple factors related to the internal and external validity of the research methods. the main methodological issue that influences the generalizability of clinical research findings is the sampling method. in this educational article, we are explai...

A face recognition system consists of two integrated parts: One is the face recognition algorithm, the other is the selected classifier and derived features by the algorithm from a data set. The face recognition algorithm definitely plays a central role, but this paper does not aim at evaluating the algorithm, but deriving the best features for this algorithm from a specific database through sa...

Abstract:  The precision of conventional sampling designs is not usually satisfactory for estimating parameters of clump and rare populations. Many of fish species live in school and disperse all over a vast area like a sea so that they are rare compare to their habitats. Theory of a class of sampling designs called adaptive sampling designs has rapidly grown during last decade which solved the...