Since these commercial assays are similar, and systematic variables were isolated by using the same total RNA starting material for all target preparations, we expected disparity in performance to reflect differences inherent to the microarray platforms.
Absolute errors in the reported angle between start and endpoints, which combines systematic and variable error, were analyzed with an ANOVA on modality × distance to the endpoint.
Changes in systematic and variable error were computed using principal components analysis, from the centroids and areas of the 95% confidence ellipses of the endpoint distributions (first and last 40 trials of each day's perturbation blocks).
Since the dynamic perturbations decayed with hand velocity at movement termination, reductions in systematic and variable errors could have been achieved simply by increasing stiffness during the terminal segment of the movement (as suggested in the model of Scheidt and Ghez, 2007).
This way students deal with a systematic multi-variable study of a complex system involving an heterogeneous (solid gas) non-catalytic reaction.
Moreover, effects of systematic moderator variables are rarely taken into account (Schmitt, Gooding, Noe, & Kirsch, 1984).
In regard to Figure 3(b), observe that a set of switches controlled by binary variables and drive the connection/disconnection of systematic and parity variable nodes from the MAC subgraph.
One way of doing this is with Dual Change Score Models, which distinguish true from error variance independently for the two variables of analysis, model the variables' systematic change, and simultaneously include competing hypotheses about lead-lag effects between the two variables.
RSM optimizes multiple variables by systematic variation of all variables in a well-designed experiment with a minimum number of experiments.
