Survival analysis: time-dependent effects and time-varying risk factors
نویسندگان
چکیده
منابع مشابه
Time Dependent Analysis of Micro-tubes Conveying Nanofluids Under Time-Varying Heat Flux
In this paper the numerical analysis of flow and time dependent heat transfer of micro-tube conveying nanofluid in laminar flow is investigated. In this study, convection heat transfer of nanofluid and base fluid and transient analysis for time-varying heat flux for time step of 0.0001 second are elucidated. It is observed that the pumping power of nanofluid flowing and the maximum temperatur...
متن کاملA semiparametrically efficient estimator of the time-varying effects for survival data with time-dependent treatment.
The timing of a time-dependent treatment-e.g., when to perform a kidney transplantation-is an important factor for evaluating treatment efficacy. A naïve comparison between the treated and untreated groups, while ignoring the timing of treatment, typically yields biased results that might favor the treated group because only patients who survive long enough will get treated. On the other hand, ...
متن کاملpatient survival in renal allograft failure: a time-dependent analysis
patients and methods this retrospective cohort study included 405 renal transplant patients from kerman university of medical sciences hospital, kerman, iran from 2004 to 2010. kaplan-meier method was used to estimate survival rates of patients, and time-dependent cox regression was used to examine the effect of allograft failure on patient survival. results during 4.06 years (median) of follow...
متن کاملtime dependent analysis of micro-tubes conveying nanofluids under time-varying heat flux
in this paper the numerical analysis of flow and time dependent heat transfer of micro-tube conveying nanofluid in laminar flow is investigated. in this study, convection heat transfer of nanofluid and base fluid and transient analysis for time-varying heat flux for time step of 0.0001 second are elucidated. it is observed that the pumping power of nanofluid flowing and the maximum temperature ...
متن کاملSAS® Macros for Time – Dependent Effects and Risk Factors on Survival
In traditional Kaplan-Meier or Cox regression analysis, typically a risk factor measured at baseline is examined for its association with survival thereafter. During follow-up however, things may change, such that either the effect of a fixed baseline risk factor may vary over time, resulting in a weakening or strengthening of associations over time, or the risk factor itself may vary over time...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Kidney International
سال: 2008
ISSN: 0085-2538
DOI: 10.1038/ki.2008.328