Assuming that a discordance is due to only one faulty sample amongst the replicate experiments, a simple extrapolation of these results to all 690 ENCODE ChIP-seq samples puts the biological validity of about 14% of them into question.
"There's a possibility that this is a faulty air sampler," he said.
Due to faulty blood sample collection (wrong labeling, degradation) the final genetic analysis was carried in 94% of those who underwent medical exam, i.e. 3802 subjects: 951 children 6 7 y.o.o
Causes of low quality include: hardware noise inaccuracies and impressions in sampling methods and derived data environmental effects adverse weather conditions faulty equipment.
After sampling around 900,000 mortgages in 2006 and 2007, Clayton told its clients that around 300,000 failed to meet standards — the homeowner might have lacked assets, for example, or the underlying loan document might have been faulty.
The Gallup tracking poll is just one survey out of many, and, for whatever reason — sampling error, faulty weighting, an overly tight definition of "likely voter" — its findings might not be reliable.
The technique was challenged, however, over concerns about sample contamination, faulty preparation procedures, and erroneous interpretation of the results.
However, 24 of the serum potassium results were considered inconclusive and excluded from the analysis because of the subjects' medication histories (potassium supplements, diuretics and i.v. fluid infusion) and/or faulty specimens (suspected haemolysed sample).
It is possible to reduce the number of faulty decisions when using clock and sampling rate synchronization.
