Of the 40 or so who volunteered, she said, only a few followed through with usable observations.
Due to changes in the county structure and missing data, the panel is unbalanced and the total number of usable observations is therefore 346.
The final sample of usable observations consists of 1092 sibling migrants who are children of the household head in the 647 households within the sample containing at least two siblings.
Over 150 other usable observations on the incubation period, across 6 papers, are not cited at all as sources for influenza incubation period data.
On average, this represents about 9000 usable observations per night and subject.
Computational methods are, however, only as good as their translatability into usable observations.
Responses from 44 GPs were included in the study, giving a total of 721 usable observations.
The lack of correlations may simply reflect a decrease in the statistical power of the analyses, as there were fewer usable observations within these structures.
In addition to the lack of contents and information regarding PR tools and the travel cost, the number of usable observations of only 39 municipalities is small, even though we used the data set with 100% response rate and took statistical technique for small samples, i.e., c-AIC.
On the other hand, the number of web designers who are competent to design a usable web site is, by observation, statistically rather small, and the thought of letting the average web bozo write extensions sounds like a recipe for disaster.
