We used a Cox regression model with time constant and time varying predictors to model hazard rates of HPV vaccination initiation.
We used a Cox regression model with time constant and time varying predictors to determine factors affecting the hazard of HPV vaccination initiation.
The effect of varying predictor horizon, an important MPC controller tuning parameter, was studied.
In this analysis, chronic stress will be treated as a time-varying predictor of intraindividual cognitive change across the four year follow-up, and URT will be examined as a time-varying mediator.
However, failure to consider the effect of time-varying predictors on end-points would tend to underestimate, rather than overestimate, an association [ 29], so AOD is more likely to increase rather than decrease over time [ 14].
We used the Cox proportional-hazard model with a time-varying predictor to evaluate the effect of FS administration on animal survival (Proc Phreg; SAS Version 9.2; SAS Institute, Cary, NC).
We investigated pre-event and time-varying predictors of depressive symptoms.We identified 4 trajectories: resistant (22.6% of sample), resilient (37.0%), mild depressive symptoms (32.5%), and persistent moderate depression (8.0%).
Participants who were HIV-1 infected at enrolment were analyzed separately from their partners to examine potential time-varying predictors of death.
To examine factors influencing attendance at study visits of the cohort participants we calculated odds ratios (ORs) with generalized estimated equations (GEE) to analyze fixed and time-varying predictors of study visit participation.
To deal with the unbalanced data (i.e. not all variables are observed at every wave - see Table 1) we carried forward the most recent value of each time-varying predictor to the next wave if it was missing at that wave [ 30].
Further, we support the use of time courses of time-varying predictors to improve the predictive and simulation value of the models.
