Based on the ratio of two block maxima, we propose a large sample test for the length of memory of a stationary symmetric α-stable discrete parameter random field. We show that the power function ...

Large field hospital study shows rapid COVID-19 test compares solidly with PCR detection Rapid antigen test offers advantages of time and cost savings, as well as easier distribution and application ...

A polymerase chain reaction (PCR) test detects genetic material from a pathogen or abnormal cell sample. Ways of collecting samples include a nasal swab, a saliva swab, or taking a sample of blood.