The effect variable for the cost-effectiveness analysis was mean daytime systolic ambulatory blood pressure (SABP).
Figure 1 shows the bootstrap replications on the cost-effectiveness plane using difference in COPM-P as effect variable, while Fig. 2 shows the replications using COPM-S as effect variable.
Data measured at the overall mesocosm level were assessed by analysis of variance, using precipitation regime as fixed effect variable.
These coefficients indicate by how many standard deviations the effect variable would change if the causal variable was changed by one standard deviation.
We employ a field effect variable to capture social influences, which is calculated as the percent of population in the peer group that has chosen the specific alternative.
Path coefficients (values adjacent to the arrows) correspond to the standardized coefficients calculated based on the analysis of correlation matrices and indicate by how many standard deviations the effect variable would change if the causal variable was changed by one standard deviation.
Data measured at different soil depths were analyzed by analysis of variance using a linear mixed-effects model that accounted for the experimental design by including precipitation regime, soil depth, activity (when relevant, based on communities present in heavy vs. light DNA fractions), and their interaction as fixed effects variables and mesocosm as the random effect variable.
Table 5 Fixed effect Variable Coefficient SE t statistic Prob.
If so, the initial effect of the laws, as measured by "E-Verify in effect" variable, would be zero.
Careful statistical methodology in experiments can answer whether one type of difference maker accounts for more of the variation in the effect variable for a particular population.
Finally, if any confounding bias has been sufficiently eliminated, the treatment effect can be estimated by comparing the effect variable Y of the matched treated and control units.
