Furthermore, because not all individuals experienced the same set of environmental conditions, we used the within-subject centring technique for environmental variables to separate individual variation from population trend (Kreft et al. 1995; Snijders and Bosker 1999; van de Pol and Wright 2009).
The variation from the national trend in our study area should deserve greater attention and further research is needed to explain the absence of racial/ethnic disparities in untreated caries in South Central Kentucky.
Using a computer simulation of the SD model, the variation trends from 2006 to 2030 in population, economy, water supply and demand, and pressure on the water environment were derived for Beijing, from which 12 core variables of the model were chosen as the WRCC evaluation indices.
The yield of dry gas went down with the increasing of Catalyst II, which totally differed from the variation trend of the dry gas in the Group I.
The LTO interval of both light and heavy oils used could be subdivided into three temperature intervals inferred from the variation trend of activation energy over temperature for ramped experiments.
To summarize the detailed trends in variation from CT 0 through 23, we plot the deviation of hourly FA-normalized abundance from the 24-hour average in Figure 8.
Conversely, the ECe variation trend increased again from CV = 44.6% at 0.30 m soil depth to a CV = 50% at 0.40 m soil depth.
The trend term is included to the baseline specification as formulated in equation (3), where ψ estimates the treated establishments' trend divergence from the control group, exploiting time variation from before the minimum wage introduction.
Figure 2 The variation trend of annual natural runoff from 1956 to 2009. Figure 3 The variation trend of river runoff at the Lanzhou Station in June and wet seasons (including July, August, September) from 1956 to 2000.
The same variation trend can be seen from Fig. 6b for the inlet composition of 25% H2, 25% CO, and 50% H2O.
