About Tawfiq

Tawfiq · ‎04-10-2017

Hello, I think I have the same issue as Klaur does. I'm working to get 5-year survival probability for each patinet in the dataset, and for that first I identified the So(t) by using the Baseline statement and setting the values of all covriates at ZERO, and then I looked into the dataset and took the So(5_y) which was the survival function corresponding to Time equals 5 years (or near to 5 years if I didn't have any value exactly equaled 5 years). Using the formual S(t)=So(t)^exp(XB) I could get the 5-year survival probab for each individual. BUT I want to compare my findings with those generated by a program in SAS, and see if SAS gives me the same 5-year survival probablity for each individual in my dataset. So far I couldn't figure it out, as there is no way I can specify time=5 in SAS, and it gives error. I appreciate if someone can help on this. proc phreg data=Mylib.dataset; class group (ref ='1') category (ref ='1')/ param=ref; model time (time=5)*event(0)= group category age; baseline covariates=Mylib.dataset OUT=Pred1 survival=_all_; run;

Tawfiq · ‎03-28-2017

Thanks for your help! It also works!

Tawfiq · ‎03-27-2017

Hi Reeza, I created two variables (one for censoring and another for survival_5y) and used the model and it worked! Thanks for the help!

Tawfiq · ‎03-27-2017

Hi Reeza, The code is not working. What I want is to censor survive >5 for state 2 and state 3 and get survive <=5 for state=1. If I use the model as follows proc phreg data=bc.def; class size (ref ='1') / param=ref; model survive*state(2)=size/ties=exact rl; run; the model works; but it doesn't provide survive <=5 and it adds state=3 with state=1 (or event=1) which shouldn't be the case. My purpose is to to use the model with the 2 conditions as ... model survive (<=5)*state(2 &3)=size/ties=exact rl;

Tawfiq · ‎03-26-2017

Hi All, I'm doing survival analysis, and I want to censor data >5 and state=2 or state=3, and the SAS code I'm writing is proc phreg data=bc.def; class size (ref ='1') / param=ref; model survive(<=5)*state(2|3)=size/ties=exact rl; run; While size which has 4 categories (1, 2, 3, 4) state which has 3 categories (1, 2, 3), and 1=event survive should be less than or equal 5 I wonder whether it's possible to modify the above code, and get what I intend to do. I appreciate your help!

Tawfiq · ‎03-20-2017

Hi, It works. Thanks for the help!

Tawfiq · ‎03-20-2017

Hi Reeza, The variable is Last_date (see below). It's format is $10. My purpose is to change it to numeric so that the blank rows will be filled with (.) or missing values and the date format (ddmmyy10.) would allow me to use this variable for creating new vars. Last_date 01/12/2011 05/08/2010 I used LRec_date=input (Last_date, $10.); format LRec_date ddmmyy10.; BUT the error message is this (The format $ddmmyy was not found or could not be loaded)

Tawfiq · ‎03-19-2017

Thanks all of you for the support. I've come accross another question. I've imported a date variable from excell; but the format for the date variable is in text and perhaps this is why the missing values are not marked in "." BUT are just blank cells in SAS Viewtable. I appreciate if someone can advise on how to format the text to sas date value (such as 01/12/2011) Cheers, Tawfiq

Tawfiq · ‎03-16-2017

Hi, Can someone tell me how to create a new variable named 'End_of_study' in the format 31/12/2012, which has to be the same for all entries/rows. Regards,

Tawfiq · ‎03-08-2017

Thanks Reeza for the great help!

Tawfiq · ‎03-07-2017

Hi, I appreciate if someone can help me! How can I change the format of 20July2000 to 20/07/2000? Cheers,

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Date Last Visited	‎04-11-2017 08:57 PM

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Re: Survival Analysis with 3 levels of censor

Re: Survival Analysis with 3 levels of censor

Survival Analysis with 3 levels of censor

Re: date variable

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date variable

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Re: Survival Analysis with 3 levels of censor

Re: PROC PHREG - survival probability at specific point of time

Re: Survival Analysis with 3 levels of censor

Re: Survival Analysis with 3 levels of censor

Re: Survival Analysis with 3 levels of censor

Survival Analysis with 3 levels of censor

Re: date variable

Re: date variable

Re: date variable

date variable

Re: dates

Change the format of a date value