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Error counts are not randomly distributed across the sample, but are correlated with household characteristics, potentially introducing sample bias if dubious observations need to be dropped.
Samples kept in10 mL glass tubes (evacuated before introducing sample gas)—were injected directly to the preconcentrator.
This outlet allows diverting bubbles and priming of the micro dispensing valve without introducing sample into the cantilever chamber before it is required.
Additionally, we employed a non-probability sample, or convenience sample, therefore introducing sample bias and therefore the results are not representative.
Introducing sample rotation within the beam certainly improves the reliability in the intensities; however, a stationary sample can still produce all the reflections in the diffraction pattern and give very reproducible intensity ratios.
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Briefly, the direct mercury analyzer liberates mercury by introducing samples into a controlled heated environment.
Most studies conducted so far were based on rather limited number of markers probably introducing sampling biases.
On-column injection has become a popular method for introducing samples into the gas chromatograph for PBDE analysis [ 18– 20] and is comparable in cost to split/splitless injectors.
A polydimethylsiloxane (PDMS) microfluidic channel is used to efficiently and reproducibly introduce sample containing soluble proteins/cells to the sensor.
Days before the Super Bowl in Miami, one of his friends from Baltimore, cornerback Lenny Lyles, wanted to introduce Sample to Richardson, the Colts receiver.
It could be argued that the loss of observations introduces sample selection biases.
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