The proportional hazard assumption was fulfilled for all these covariates at the Cox regression analyses, with use of the test for all time-dependent covariate variables added.
The average value for all time-dependent cold- and heat-shock specific networks are significantly higher than the values for a randomly drawn set of reactions of the same size.
To show superiority regarding safety and efficacy endpoints of AMS over PTA alone, life tables according to the method of Kaplan Meier are presented for all time-dependent events.
To test the proportional hazards assumption, we generated time-dependent covariates by including interactions of each predictor with the natural log of age (the time metric); probability values for all time-dependent covariates were >0.05, consistent with hazards that are proportional.
There is no evidence for a time dependent treatment effect.
We note that while this cohort study incorporated detailed measures of job stress as well as substantial covariate information, we do not view the collection of covariate information as sufficient to control for all confounding, particularly time dependent confounding.
The last column of each record holds the number of triplets for the time dependent variables for that particular record, with 0 if there were no changes for the time dependent effect, or these are not used at all.
Overall the Chebyshev method is recommended for time independent potentials and the Lanczos method for time dependent potentials.
In particular, three technical components are proposed including: i) an accuracy metric for time dependent model responses under uncertainty, ii) effective approaches for time dependent model bias calibration and approximation, and iii) reliability analysis considering the time dependent model bias.
M. H. Graham, M. Taylor, M. Miller, and K. Braun, "Method and apparatus for time dependent data transmission," U.S. Patent 5,696,790.
