Although there is no empirical evidence on the effect of such factors on VA-derived causes of death, and InterVA was designed with the reality of different VA data collection tools in mind (eg, only affirmative reports of the presence of indicators influence cause probabilities), the possibility that differing cause distributions are driven by differing data capture methods cannot be ruled out.
If a situation arose in which confounder measurement error differed across the subgroups, perhaps through different data collection procedures, then this would lead to confounder measurement error biasing the estimated genotype by exposure interaction.
The task is made difficult, in part, by differing definitions and data collection practices for unconventional drilling used in the states.
Differing definitions, data collection methods, drug type/regimen and patient populations make comparing rates of hypoglycaemia difficult.
Lastly, since this study used secondary data from the Panel Study on Korean Children, the time period differed for data collection.
The health statistics systems differ in data collection methodology and area of coverage.
It differs from our data collection form as it was evolved later in the process of our analyses.
BY participated in data collection and interpretation of the study.
Differences in rates of unwanted solicitations may reflect differing methodologies in data collection or the demographics of the population studied.
Only drug costs, which averaged €1315.52 in complete data collection, differed significantly from incomplete data collection when applying Alt 3 (€1264.26) and Alt 2 (€1291.31).
For measures where the estimates differed significantly between the two surveys, it can be difficult to determine how much of the difference was caused by data collection mode and how much is due to other effects.
