(3) In view of the accuracy requirement for stiffness measurement, the track stiffness measurement can be categorized based on three grades, namely low accuracy (10 kN/mm, substructure disease identification, for heavy haul railways mainly), medium accuracy (1 kN/mm, potential safety hazard checking), and high accuracy (0.1 kN/mm, evaluation of track regularity, for high-speed railways mainly).
One of the main differences between the program offered by Cox et al. [38] compared to the interventions provided by Becker et al. [37] and Jensen et al. [39] is the performance of environmental hazard checks in facilities as well as direct offering of exercise programs or hip protectors to residents in the latter studies.
All behavioural covariates were considered as time dependent and therefore no proportional hazard checks were required.
The student trainers walked participants through the steps of CPR, including dialing 911, checking the immediate area for safety hazards, checking the victim's breathing and administering chest compressions.
The assumption of proportional hazards, checked by including the interaction term between each sweet beverage and age, was not violated.
The assumption of proportional hazards, checked by including time-dependent covariates in the model, was not violated.
The assumption of proportional hazard was checked by graphically comparing the hazard curves.
The assumption of proportional hazard were checked and found to be adequately met.
Being an indifferent gambler, we showed it to a wildcat friend who once hazarded a checking account with Bank of U.S., later with Harriman, and finally feathered his next with Straus bonds.
Assumption of proportional hazards was checked by including time-dependent covariates of explanatory variables into the initial model [40], but no evidence for time-dependence of these effects was found.
