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A heteroskedasticity-consistent covariance matrix estimator and a direct test for heteroskedasticity

This gets the job done, but can sound very loud and jarring to those around you

Nicotine tests, such as those used by employers or insurance companies, test for both

In the south-western counties (Cara-Severin, Mehedini, Timi) are detected, in general, medium and superior quality cigarettes purchased from duty-free shops and crossed over the border, in small quantities, by natural persons

The US Centers for Disease Control and Prevention (CDC) reported several cases of bronchiolitis obliterans in workers in a microwave popcorn plant in Missouri in 2000

Taylor and others, 2023