The problem of estimating the variance of the ratio estimator in sampling with probability proportional to aggregate size is investigated. The form of nonnegative ...

Biotherapeutic formulations have been characterizing particles through optical microscopy for a long time. The obtained shape, size, and transparency characteristics are used to categorize ...

Researchers have found evidence that "marine snow" -- aggregates of organic material floating in water bodies -- may act as microscopic, island-like refuges for pathogens, or disease-causing organisms ...

Citation: Shear, B. R., Whitfield, E., & Nath, K. (2025). Investigating the relationship between sample size and reliability of aggregate test score measures in Colorado schools. Boulder, CO: The ...