Reviewers
|
Book & Monographs
|
Conference
|
Contact Us
SEARCH
|
My Profile
|
My Shopping Cart
|
Logout
Home
Publication Ethics
Open Access Policy
Guidelines
Journals
▼pphmjopenaccess.com▼
Engineering
Mathematics
Statistics
All Journals
Submit a Manuscript
Author Login
Author Registration
Forget Password
Journal Menu
Journal Home
Editorial Board
Guidelines for Authors
Indexing
Contents
Contents
Subscribe
Publication Ethics and Publication Malpractice Statement
Content
Volume 25 (2025)
Volume 25, Issue 1 (In Progress)
Pg 1 - 15 (March 2025)
Volume 24 (2024)
Volume 24, Issue 3
Pg 399 - 572 (November 2024)
Volume 24, Issue 2
Pg 197 - 397 (July 2024)
Volume 24, Issue 1
Pg 1 - 196 (March 2024)
Volume 23 (2023)
Volume 23, Issue 3
Pg 227 - 327 (November 2023)
Volume 23, Issue 2
Pg 95 - 225 (July 2023)
Volume 23, Issue 1
Pg 1 - 94 (March 2023)
Volume 22 (2022)
Volume 22,
Pg 1 - 84 (December 2022)
Volume 21 (2022)
Volume 21,
Pg 1 - 154 (September 2022)
Volume 20 (2022)
Volume 20,
Pg 1 - 123 (June 2022)
Volume 19 (2022)
Volume 19,
Pg 1 - 144 (March 2022)
Volume 18 (2021)
Volume 18, Issue 3
Pg 305 - 504 (December 2021)
Volume 18, Issue 2
Pg 149 - 303 (August 2021)
Volume 18, Issue 1
Pg 1 - 147 (April 2021)
Volume 17 (2020)
Volume 17, Issue 2
Pg 307 - 602 (December 2020)
Volume 17, Issue 1
Pg 1 - 305 (June 2020)
Volume 16 (2019)
Volume 16, Issue 2
Pg 1 - 158 (December 2019)
Volume 16, Issue 1
Pg 1 - 111 (June 2019)
Volume 15 (2018)
Volume 15, Issue 2
Pg 83 - 173 (December 2018)
Volume 15, Issue 1
Pg 1 - 82 (June 2018)
Volume 14 (2017)
Volume 14, Issue 2
Pg 85 - 120 (December 2017)
Volume 14, Issue 1
Pg 1 - 84 (June 2017)
Volume 13 (2016)
Volume 13, Issue 2
Pg 103 - 238 (December 2016)
Volume 13, Issue 1
Pg 1 - 101 (June 2016)
Volume 12 (2015)
Volume 12, Issue 2
Pg 81 - 178 (December 2015)
Volume 12, Issue 1
Pg 1 - 80 (June 2015)
Volume 11 (2014)
Volume 11, Issue 2
Pg 89 - 168 (November 2014)
Volume 11, Issue 1
Pg 1 - 88 (June 2014)
Volume 10 (2013)
Volume 10, Issue 2
Pg 49 - 92 (November 2013)
Volume 10, Issue 1
Pg 1 - 48 (August 2013)
Volume 9 (2013)
Volume 9, Issue 2
Pg 67 - 118 (May 2013)
Volume 9, Issue 1
Pg 1 - 66 (February 2013)
Volume 8 (2012)
Volume 8, Issue 1-2 (Aug-Nov)
Pg 1 - 77 (November 2012)
Volume 7 (2012)
Volume 7, Issue 2
Pg 61 - 119 (May 2012)
Volume 7, Issue 1
Pg 1 - 59 (February 2012)
Volume 6 (2011)
Volume 6, Issue 2
Pg 77 - 120 (November 2011)
Volume 6, Issue 1
Pg 1 - 75 (August 2011)
Volume 5 (2011)
Volume 5, Issue 2
Pg 73 - 137 (May 2011)
Volume 5, Issue 1
Pg 1 - 71 (February 2011)
Volume 4 (2010)
Volume 4, Issue 3
Pg 213 - 311 (October 2010)
Volume 4, Issue 2
Pg 107 - 212 (June 2010)
Volume 4, Issue 1
Pg 1 - 105 (February 2010)
Volume 3 (2009)
Volume 3, Issue 3
Pg 171 - 256 (October 2009)
Volume 3, Issue 2
Pg 77 - 169 (June 2009)
Volume 3, Issue 1
Pg 1 - 75 (February 2009)
Volume 2 (2008)
Volume 2, Issue 3
Pg 169 - 261 (October 2008)
Volume 2, Issue 2
Pg 81 - 168 (June 2008)
Volume 2, Issue 1
Pg 1 - 80 (February 2008)
Volume 1 (2007)
Volume 1, Issue 3
Pg 217 - 306 (October 2007)
Volume 1, Issue 2
Pg 109 - 215 (June 2007)
Volume 1, Issue 1
Pg 1 - 108 (February 2007)
Categories
▼pphmjopenaccess.com▼
Engineering
Mathematics
Statistics
All Journals
JP Journal of Biostatistics
JP Journal of Biostatistics
Volume 4, Issue 2, Pages 123 - 138 (June 2010)
OVERCOMING THE PROBLEM OF INDEPENDENCE ASSUMPTION IN COMPETING RISKS MODEL BY GAMMA FRAILTY MODELS: APPLICATION FOR IRANIAN COLORECTAL CANCER PATIENTS
Mohamad Asghari Jafarabadi, Ebrahim Hajizadeh, Anoshirvan Kazemnejad and Seyed Reza Fatemi
Abstract:
In the competing risks problem, wherein occurring the event by one cause prevents it by other cause(s), the assumption of independence cannot be checked by data only and the classical analyses are usually done by considering the independence assumption. This paper shows how the results of Finkelstein and Esaulova [5] can be extended to overcome the problem of independence assumption in competing risks model by using frailty models. Gamma frailty model and Weibull distribution for competing failure times were considered and parameter was estimated. The results were applied on an Iranian colorectal cancer real data set by three approaches: ordinary Weibull model, ordinary Weibull model with robust standard error (SE) and Weibull model with frailty component. In the third approach, in spite of two other approaches, both the parameter estimates and their SE’s have been adjusted for model assumption related misspecifications. Therefore inserting frailty component will do a model correction on both aspects of accuracy and precision. This finding may be useful for many situations at which there is uncertainty about or the independence assumption of failure times is not hold, such as competing risks, recurrent events and clustered data such as modeling clustered survival data from multicenter clinical trials.
Keywords and phrases:
competing risks, frailty, survival, gamma, Weibull, independence, colorectal cancer.
Number of Downloads:
313 |
Number of Views:
771
Previous
Next
P-ISSN: 0973-5143
Journal Stats
Publication count:
324
Citation count (Google Scholar):
424
h10-index (Google Scholar):
11
h-index (Google Scholar):
10
Downloads :
84042
Views:
260605
Downloads/publish articles:
259.39
Citations (Google Scholar)/publish articles:
1.31
This website is best viewed at 1024x768 or higher resolution with Microsoft Internet Explorer 6 or newer.
