They called for simplification of the nation's patchwork of voting systems, with routine audits of random samples of paper ballots to confirm the accuracy of machine tallies.
The ways in which fidelity was most frequently monitored included notes audits (n=12), rating of random samples of audio-recorded sessions (n=5), self-reported measures of implementation (from healthcare professionals and study participants) (n=4) and observation of practice (n=2).
An independent audit of a random sample of 20 re-extracted notes was undertaken (HS) and the quality of original data extraction examined.
Reassuringly, our results are comparable with an audit of a random sample of 500 babies conducted in 1999 2000 which, though based on small numbers of cases, similarly showed some under-reporting but high PPVs for intraventricular hemorrhage (n = 4), respiratory distress syndrome (n = 14), meconium aspiration (n = 4) and congenital anomalies (n = 49) among the general neonatal population[ 7].
**Estimated through the audit of a random sample drawn from the records for which the classification rules and the intent-flag disagreed.
Auditing only the records for which the classification rules and the intent-flag disagreed over-estimated the success rates by approximately 1% (column 4 and 5).> -wrap-foot> *Esthrough theough the audit of a random sample drawn from all treatment records.
Internet pollsters obtain their samples through other means, without the theoretical benefits of random sampling.
What is also possible is that the online polls — without the benefit of random sampling — have biased and unrepresentative samples.
Secondly, in stead of just walking through the neighbourhoods according to a route chosen by the observers during the audit, a random sample of 10% of all of the streets in one neighbourhood was selected for observation in advance (according to another Dutch neighbourhood observation protocol developed by Van Lenthe et al[ 37]).
Furthermore, we only had resources to audit a random sample of the patients (8 GP practices) to ascertain adherence to anticoagulation therapy, and did not directly assess anticoagulation in all patients entered into PCAF.
