New Hair Testing Conclusions

Society of Hair Testing guidelines for drug testing in hair.

The Society of Hair Testing (SoHT) Guidelines for Drug Testing in Hair provide laboratories with recommended best practice guidelines whether they are currently offering drug testing in hair, or plan to offer a hair testing service in the future. The guidelines include reference to recommended sample collection and storage procedures, through sample preparation, pre-treatment and analysis and t...

Consensus of the Society of Hair Testing on hair testing for chronic excessive alcohol consumption 2011.

Dissonant Conclusions When Testing the Validity of an Instrumental Variable

Validity of an Instrumental Variable Fan Yang, José R. Zubizarreta, Dylan S. Small, Scott Lorch, Paul R. Rosenbaum1 University of Chicago, University of Pennsylvania and Columbia University Abstract: An instrument or instrumental variable is often used in an effort to avoid selection bias in inference about the effects of treatments when treatment choice is based on thoughtful deliberation. Ins...

DNA-testing for immigration cases: the risk of erroneous conclusions.

Making the correct decision based on results from DNA analyses and other information in family reunification cases can be complicated for a number of reasons. These include stratified populations, cultural differences in family constellations, families with different population origin, and complicated family relations giving complex pedigrees. The aim of this study was to analyze the risk of er...

Aporetic Conclusions When Testing the Validity of an Instrumental Variable

Validity of an Instrumental Variable Fan Yang, José R. Zubizarreta, Dylan S. Small, Scott Lorch, Paul R. Rosenbaum1 University of Pennsylvania and Columbia University Abstract: An instrument or instrumental variable is often used in an effort to avoid selection bias in inference about the effects of treatments when treatment choice is based on thoughtful deliberation. An instrument is a haphaza...