When the correlation of the performance variable of surrogate variable exists, this article proposes a two-stage charting design to monitor either the performance variable or its surrogate variable in an alternating fashion rather than monitoring the performance variable alone.
If such a variable exists, even though we still have (at least) two local maxima, the "correct" set of estimated parameters always leads to the highest maximum.
In addition, another variable exists in this work: The ratio of the gap height between the capacitor section and the actuator section.
Discriminating which variable is responsible for the observed richness trend, given that a single variable exists, is problematic considering that most variables are correlated (e.g., wave stress and depth, stratification and temperature).
If such a variable exists, then by studying the patterns of covariation among the observed variables, we can understand and characterize the nature of the latent variable[ 11].
However, if another confounding variable exists that was not included in the predicted probability calculation, it could still explain our results.
(2006) showed that under the assumptions that the data generating process is linear, no confounding latent variable exists, and disturbance variables have non-normal distributions of non-zero variances, the best fit acyclic model can be identified.
We are also looking for parsimony in our model, and this simple approach is insufficient to justify including a nonlinear term if no fundamental ancillary evidence for a nonlinear relationship with the dependent variable exists or can be substantiated.
This formula is considered more valid than the popular formula Pe × (RR−1)/(Pe × (RR−1)+1), where Pe is the proportion of the source population exposed to the risk factor, when a confounding variable exists (Rockhill et al, 1998).
Few confounding variables existed.
