[R] Survival Analysis

[David Winsemius]

On Jul 18, 2011, at 10:42 AM, Kishor Tappita wrote:

> Ok David, Thanks for clearing my misconception. Then could you  
> please suggest me how I could get the KM estimate for a time point.  
> I remember reading the formula
> for calculating the KM. Do, I have to write a method to compute the  
> KM estimate or will the survival package provide it for me?

?survfit
?survfit.formula

-- 
david.

>
>
> Thank you so much in advance.
>
> Regards,
> Kishor
>
> On Mon, Jul 18, 2011 at 7:52 PM, David Winsemius <dwinsemius at comcast.net 
> > wrote:
>
> On Jul 18, 2011, at 10:10 AM, Kishor Tappita wrote:
>
>> Dear David,
>>
>> Thank you for your reply. I realized that the summary  function can  
>> help me in finding the the order of the curves.
>> The 0.95UCL (95% upper confidence level) column in particular seems  
>> to follow the same pattern as the curves on the plot.
>
> That would not have been my prediction. The 95% UCL could be high  
> simply because the sample size in that group was small.
>
> -- 
> David
>
>>
>> I am new to survival analysis, so  please correct me if I am wrong.
>>
>> Thanks,
>> Kishor
>>
>>
>>
>> On Mon, Jul 18, 2011 at 3:21 AM, David Winsemius <dwinsemius at comcast.net 
>> > wrote:
>>
>> On Jul 17, 2011, at 11:27 AM, Kishor Tappita wrote:
>>
>> Dear List,
>>
>> I used survival package of R and was able to generate KM plots. Now  
>> I need
>>
>> help in finding the top curve in a non-visualization way. I mean to  
>> say that
>> I would like to know the order of curves through any existing  
>> methods rather
>> than looking at the KM plots. I need this information as I am  
>> generating KM
>> plots for thousands of genes.
>>
>> Why aren't you taking the KM estimate at a particular time?
>>
>> -- 
>> David
>>
>>
>> I would really appreciate if some one can direct me and help me.
>>
>> Thanks,
>> Regards,
>> Kishor
>>
>>        [[alternative HTML version deleted]]
>>
>> ______________________________________________
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>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>> David Winsemius, MD
>> West Hartford, CT
>>
>>
>
>
> David Winsemius, MD
> West Hartford, CT
>
>

David Winsemius, MD
West Hartford, CT