Monitoring data from the US Environmental Protection Agency (EPA) Chemical Speciation Network (CSN) have been a valuable resource for studying the association of PM 2.5 components and health. The CSN ...

This is a preview. Log in through your library . Abstract A new estimation scheme of the spectral density function of a stationary Gaussian time series using observations at discrete times is ...

The first video in Pew Research Center’s Methods 101 series helps explain random sampling – a concept that lies at the heart of all probability-based survey research – and why it’s important. Fresh ...

Mary Hall is a editor for Investopedia's Advisor Insights, in addition to being the editor of several books and doctoral papers. Mary received her bachelor's in English from Kent State University with ...